The 2nd meeting of XLIC WG1 “Ultrafast electron dynamics in molecules” will take place on August 29-30, at the University of Edinburgh. The organizer of the COST WG1 meeting is Dr. Olga Smirnova. The local organizer of the COST WG1 meeting is Dr. Adam Kirrander.
The place for the meeting also allows the COST members to take advantage of the very interesting Faraday Discussions, ‘Ultrafast imaging of photochemical dynamics’ , which will also take place in Edinburgh on August 31-Sept 2, see http://www.rsc.org/ConferencesAndEvents/RSCConferences/FD/Photodynamics-FD2016/index.asp.
If you have not yet taken notice of this Faraday Discussion, please note that the deadline for the Faraday Discussions abstract (poster) submission is June 20.
We have reserved 100 rooms on campus, at the student dorms, for the duration of both the COST and the Faraday Discussions meetings.
To reserve accommodation during the meeting please use the link below: http://www.epay.ed.ac.uk/browse/extra_info.asp?compid=1&modid=2&deptid=24&catid=17&prodid=2265&searchresults=1
On the booking site, if you click on the Package Option tab, you’ll see two room booking options, one for 3 nights at £240 – this is in a nicer room with ensuite bathroom.
This option 2 is a booking for 5 nights (covering both the XLIC and the FD), in less attractive but more affordable rooms with shared bathroom (approx 4-5 rooms per bathroom).
The deadline for room booking is June 1.
Alternative/additional options for accommodation for five days covering both meetings are offered by the FD meeting booking system: http://www.epay.ed.ac.uk/browse/extra_info.asp?compid=1&modid=2&deptid=24&catid=17&prodid=2268&searchresults=1
You can find more options via hotel booking service appointed for the FD : http://www.ellis-salsby.co.uk/forthcoming-events/ultrafast-imaging-of-photochemical-dynamics-faraday-discussion.html
Abstract submission for the WG1 meeting is now open. Submission deadline is June 20.
7 hot topic talks will be selected from all submitted abstracts.
Please send abstracts to: firstname.lastname@example.org and Adam.Kirrander@ed.ac.uk and use the subject line: Edinburgh COST WG1 abstract.
Abstract (poster) submission deadline for the Faraday discussion is June 20.
BRIEF WG1 MEETING PROGRAMME
NEW! Final programme can be downloaded here: 2ndWG1meeting-program
Session 1: “Ultrafast Non-adiabatic dynamics, Surface hopping, solvent effects”.
Discussion leader: V. Engel.
Invited speakers: M. Barbatti, B. Lasorne, F. Santoro
Session 2: “Synchrotrons, ultrafast optical and X-ray absorption spectroscopies”
Discussion leader: V. Averbukh
Invited speakers: O. Travnikova, M.A. Hervé du Penhoat, C. Milne
Session 3: “Time-resolved cluster dynamics”
Discussion leader: T. Fennel
Invited speakers: D. Rolles, M. Krikunova, U. Saalman
Session 4: “Imaging and control of molecular dynamics”
Discussion leader: R. Moshammer
Invited speakers: J. Kuepper, R. Forbes, M. Richter, J. Feist
Session 5: “Multielectron dynamics in external fields: advances in theory”
Discussion leader: E. Suraud
Invited speakers: L. Madsen, A. Scrinzi, H. Bachau, S. Patchkovskii
Session 6: “New trends in attosecond spectroscopy”
Discussion leader: M. Ivanov
Invited speakers: J. Mauritsson, A. Brown, M. Dahlström, F. Lepine
NEW! PRACTICAL INFORMATION
Travel from Edinburgh airport (in order of convenience)
TAXI: Follow signs in the terminal, the taxi rank is located at the bottom of the building across from the terminal. A taxi from the airport to a city centre location should cost about £25-£30 (credit cards are normally accepted, but check with driver).
BUS: Airport busses to the city centre (bus no. 100) are frequent and depart from outside the terminal building. The bus terminates at Waverley Train Station, in the centre of Edinburgh, with a taxi rank close by for onwards travel. A return ticket is £7.50.
TRAM: One can also travel from the airport to the city centre by tram. The trams depart from a station outside the terminal. Make sure to get off at the right stop (for most, this will be the stop closest to Waverly Train Station i.e. St Andrews Square). Note that the tram is slower than the bus. A return ticket is £8.50.
Travel to Pollock Halls, for those who booked the conference accommodation
The easiest way to travel to Pollock Halls is to take the taxi directly from the airport to Pollock Halls. A cheaper alternative is to take an airport bus (see above) to the final stop at Waverley Train Station and then take a taxi to Pollock Halls for approx. £5 (in addition to the airport bus fare).
Please report at the reception at Pollock Halls (open 24/7). The address of the reception is: 18 Holyrood Park Road, EH16 5AY, Edinburgh (note that google maps for some reason places the location marker inside the campus area, when in fact the reception is located near the entrance).
The conference takes place in Lecture Theatre T250 in the Joseph Black Building at the King’s Buildings Campus of University of Edinburgh (see http://www.ed.ac.uk/maps/maps for campus maps). A registration desk inside the entrance of the Joseph Black Building will be open from 08.20 every morning. The address is:
School of Chemistry
Joseph Black Building
King’s Buildings Campus
University of Edinburgh
David Brewster Road
EH9 3FJ Edinburgh
(GOOGLE MAPS: https://goo.gl/maps/GEuDbJod59T2)
For those staying at Pollock Halls, it is a 9 minute taxi ride (approx. £6) or a 26 minute walk (see e.g. Google Maps for directions).
Last but not least, the meeting will occur at the time of the world-famous Edinburgh Theater Festival https://www.edfringe.com/, which many of you might get a chance to enjoy.
Please, complete the form below to register. The registration deadline is June 5.No more submissions accepted at this time.
Photochemical reactions have tremendous scientific importance, ranging from photosynthesis to atmospheric reactions, and technologies such as sensors or displays. Due to the intrinsic complexity of photochemical reactions, they remain the least understood type of chemical process. Nonadiabatic dynamics, ultrafast time-scales, quantum effects and conical intersections are known to be important, but a detailed comprehension remains elusive. However, new experimental techniques capable of monitoring photochemical processes in unprecedented detail are appearing. This includes the development of intense-laser techniques, the construction of free-electron lasers such as the XFEL in Europe and the LCLS in the USA, new sources of pulsed electrons, advanced detection techniques, and important advances in theoretical modelling of quantum dynamics. Many of these techniques are developed by research communities not traditionally concerned with photochemistry, but provide an opportunity to shed new light on photochemical dynamics.
The themes for the meeting are:
Electronic and non-adiabatic dynamics
Attosecond processes and X-ray spectroscopy
Vibrational and condensed phase dynamics
Deadline for abstract submission: Dec. 14, 2015
Confirmed speakers include:
Prof. Dan Neumark (Berkeley), Prof. Dwayne Miller (Hamburg), Prof. Fernando Martin (Madrid), Prof. Shaul Mukamel (Irvine), Prof. Albert Stolow (Ottawa), Dr. Yann Mairesse (Bordeaux), Dr. Mike Minitti (SLAC), Prof. Artem Rudenko (Kansas), Prof. Andrew Orr-Ewing (Bristol), Dr. Junko Yano (Lawrence-Berkeley)
A full research paper containing new unpublished results always accompanies oral presentations at Faraday Discussions. The oral/paper abstract should outline current research in progress. Authors of the selected abstracts must then submit a full research paper with a significant amount of new, unpublished work by 11 April 2016. The research papers and a record of the discussion are published in the journal Faraday Discussions (Impact factor 4.606).
If you are not familiar with the format of Faraday Discussions we suggest you visit the conference website (http://tinyurl.com/ouqlfqj). We look forward to your submissions.
Adam Kirrander and Russell Minns on behalf of the Scientific Committee (Jon Marangos, Nina Rohringer, Olga Smirnova, and Peter Weber)
The XLIC WG1&WG2 Expert Meeting “From Ultrafast to Ultraslow Dynamics in Molecules and Clusters” will be held in the Weizmann Institute of Science Israel , from 23th to 25th January 2017.The Meeting is jointly organized by the Local organizing committee, the team of the conference unit of the Weizmann Institute and COST CM1204 Action (XLIC).
The workshop participation is open to everybody.
Scope and Program of the Meeting
Dynamical processes in molecular and cluster systems play an important role in different disciplines of research including atmospheric and interstellar chemistry, biology, nano-science and more. It is appealing to classify different types of dynamics according to their time scale – from attosecond electronic dynamics, femtosecond and picosecond ro-vibrational motion up to typical nanosecond times of spontaneous radiative processes. However, even in small clusters and biomolecules, coupling of many degree’s of freedom can lead to ultra-slow dynamics extending up to millisecond times.
In recent years, experimental techniques for studying these different dynamics have considerably advanced – from the development of ultrafast light sources, including high-order harmonic generation and free electron laser X-ray facilities, as well as highly controlled ion traps and ion storage rings that allow following a slow evolving time evolution of isolated molecular and cluster ions. On the theoretical side, quantum mechanical calculations provide insight regarding short time scales, while statistical models can describe long time dynamics on the ensemble level.
These communities have developed in parallel and often with little interaction with each-other. The goal of this workshop will be to bridge the gap between the different communities towards a full understanding of molecular and cluster dynamics. For example, it will be valuable to understand the role of initial ultrafast electronic and vibrational rearrangement of an isolated system on its slow decay by statistical fragmentation. Does ultrafast dynamics leading to internal conversion influence delayed recurrent fluorescence events? What is the importance of the coherent vibrational motion for long term processes and spectroscopic probes of isolated interstellar environments or biomolecular systems?
We aim at achieving this goal by bringing together leading experts from the different fields: including atto-second science, femto-chemistry, action spectroscopy, ion storage devices, time-dependent quantum mechanics and statistical physics – in order to promote a common language and shared goals. In particular, participants will be asked to highlight the scientific goals and challenges of each field to promote collaborative efforts. We hope that this conference will generate long term collaborations that will advance our understanding of molecular and cluster science across the different time scales.
Abstract Submission Deadline: November 1st, 2016
Registration Deadline: January 5th, 2017
List of invited speakers
Noam Agmon, Hebrew University, Israel
Lars H. Andersen, Aarhus University, Denmark
Itzik Ben-Itzhak, Kansas State University, USA
Valerie Blanchet, CELIA, Bordeaux, France
Anastasia Bochenkova, Moscow State University, Russia
Steen Brondsted Nielsen, Aarhus University, Denmark
Philip Bucksbaum, Stanford, USA
Francesca Calegari, Politecnico Milano, Italy
Lorenz Cederbaum, University of Heidelberg, Germany
Henrik Cederquist, Stockholm University, Sweden
Brett Esry, Kansas State University, USA
Sharly Fleischer, Tel-Aviv University, Israel
Jason Greenwood, Queen’s University Belfast, UK
Christiane Koch, Universität Kassel, Germany
Ronni Kosloff, Hebrew University, Israel
Holger Kreckel, MPI-K Heidelberg, Germany
Stephen Leone, UC Berkeley, USA
Nimrod Moiseyev, Technion, Israel
Edvardas Narevicius, Weizmann Institute, Israel
Daniel Neumark, UC Berkeley USA
Thomas Pfeifer, MPI-K Heidelberg, Germany
Igor Schapiro, Hebrew University, Israel
Haruo Shiromaru, Tokyo Metropolitan University, Japan
Jan. R. R. Verlet, Durham University, UK
Mathias Weber, JILA, Colorado, USA
Roland Wester, Universität Innsbruck , Austria
2nd MOLIM Training School: Advanced technics for molecular spectroscopy and dynamics
The 2nd MOLIM Training School focuses on the recent experimental developments occurred in the field of molecular spectroscopy and reaction dynamics. World-wide experts working in European country will be invited to present the most relevant state-of-the-art techniques and their applications. The trainees will benefit from visits of the brand new laser servers ATTOLAB and CILEX as well as of the synchrotron SOLEIL. By team of 2 to 3 trainees, the students will be involved in a laboratory project hosted in several laboratories of the Paris-Saclay University.
The registration is open to Master students, Ph.D students, post-docs and permanent scientist from all European countries. Affiliation to the COST MOLIM is not required to participate to this school. The school can welcome up to 40 Europeans trainees and 10 more students from Paris region.
The registration deadline is fixed at Feb 24th 2017. Booking of rooms by the Committee will be possible up to Jan. 31st 2017.
Knuth Asmis (Leipzig, D)
Valérie Blanchet (Bordeaux, FR)
Juraj Fedor (Prague, CZ)
Gustavo Garcia (Paris-Saclay, France)
Katharina Kohse-Höinghaus (Bielefeld, D)
Anne Lafosse (ISMO, F)
Franck Lépine (Lyon, FR)
Andrew Orr-Ewing (Bristol, UK)
Katharine Reid (Nothingham, UK)
Claire Vallance (Oxford, UK)
Katalin Varjú (Szeged, HU)
Roland Wester (Innsbruck, AU)
Organizing Comittee :
The 4th XLIC General Meeting (COST Action CM1204) will be held in Prague, Czech Republic, on March 14-16, 2017. It will also host the final XLIC Management Committee (March 14) and the 3rd Young Scientist Forum (YSF).
Deadline for the submission of abstracts is January 31st, 2017. Abstracts should be written in English and uploaded via the online form.
Interested participants must register before February 14th, 2017, by filling the corresponding form. All meeting participants must pay a conference package (including lunch, dinner and coffee) for the days attending the meeting. To proceed with the payment, please, fill, sign and send to email@example.com the following form.
The conference will consist of lectures given by invited speakers, Young Scientist Forum and 2 poster sessions.
NEW: The draft full scientific program, including timetable, talks and list of poster contributions can be downloaded here: XLIC_GM_2017-ScientificProgram (the most updated version should be checked in the meeting website: http://www.jh-inst.cas.cz/xlic2017/programme).
3rd YOUNG SCIENTISTS FORUM:
There shall be a special half-day session with talks given by young researchers (PhD students and post-docs) on March 15. It will include 12 lectures, out of which 6 oral contributions will be chosen by YSF committee based on submitted abstracts. The deadline for abstract submission for YSF was 31st January 2017.
Applicants asking for the talk at YSF are also required to submit a short CV which is to be emailed to firstname.lastname@example.org. Abstracts submitted after the deadline will not be considered for the selection.
For more details see http://www.jh-inst.cas.cz/xlic2017/home and http://www.xlic.eu. You can also contact A. Domaracka (email@example.com).
Selected YSF speakers can ask for financial support from XLIC COST Action.
NEW: The list of young researchers selected to give a talk has been published here: https://xlic.qui.uam.es/?p=3369
Due to all-under-one-roof format of the conference, accommodation is also available: both single and double rooms for the price of 65 EUR/night. To book your room, please, fill, sign and send to firstname.lastname@example.org the following form before February 14th, 2017.
More information can be found in the meeting website: http://www.jh-inst.cas.cz/xlic2017/accommodation
The participation of XLIC MC members and speakers will be supported with Action budget (with the exception of MC Observers coming from IPC Institutions). COST will also fully reimburse those young researchers selected for oral contributions in the Young Scientist Forum and, depending on the budget, we will try to cover also expenses from other young participants.
Participants entitled for reimbursement will receive an official notification before the meeting. We strongly recommend to check the COST rules for reimbursement before incurring any expense in:
- COST Vademecum, page 20-24, and /or
- the instructions on how to fill the Travel Reimbursement Request Form (TRR)
Accommodation and meal expenses will be reimbursed on the basis of flat rates. A reduction on maximum flat rates allowed for this particular meeting has been agreed by XLIC MC. The applicable rates are 100 EUR for accommodation and 20 EUR for meal expenses. For participants staying in cheaper hotels less money can be claimed by requesting the reimbursement for a smaller number of nights/meals.
For travel expenses actual costs can be claimed on the basis of the receipts provided (any restriction applying to travel expenses will be notified to each participant entitled for reimbursement).
Participants selected for reimbursement are kindly asked to keep their expenses as low as possible to ensure a wide distribution of the Action budget.
The submission of claims shall be done after the meeting, but, for any non-regular expense or doubt you may have, please, better ask in advance (email@example.com). E.g. fligths departure/arrivals from/to places other than where the eligible participant is working/residing, extra meals, nights, taxi expenses, etc. shall not be reimbursed if permission is not requested before the meeting.
Please note that claims submitted later than 30 days after the meeting shall not be considered.
The scientific workshop: “Massive Computation for Ultrafast Molecular Breaking” (MACUMB 2017) will be held in the Universidad Autónoma de Madrid (Spain) on 25th and 26th of May 2017.
The scientific program (http://www.macumb.info/programme.html) includes ten invited talks that will be combined with two 3-hours practical sessions in computer rooms. We aim to bring together developers of the state-of-the-art scientific software in the field of quantum chemistry and molecular physics.
Registration is already open and closes on May 15th, 2017. The registration for the meeting is free for all participants.
You can find detailed information at http://www.macumb.info/
Alicia Palacios, Sergio Díaz-Tendero and Jesús González-Vázquez
Departamento de Química, Facultad de Ciencias
Universidad Autónoma de Madrid
The CECAM workshop Seeking synergy between dynamics and statistics for non-equilibrium quantum processes will be held in Paris in June 6th-9th.
One of the major difficulties in achieving an accurate theoretical descriptions of non-equilibrium processes in quantum mechanical systems is framed by the desire to provide a representation of the system of interest that is as realistic as possible, in a manner that is computationally tractable. The coupling of electronic and nuclear motion involving excited states, the quantum nature of the nuclear degrees of freedom, and the application of time-dependent driving forces, are just few examples of the effects that must be addressed in order to simulate these processes. Each of these effects poses unique challenges to theoretical progress. A number of exact and approximate quantum dynamics techniques are being developed and refined in order to provide algorithms that respond to the demand for a balance between computational efficiency and physical accuracy. Currently available techniques are typically based upon two different, but equivalent, formulations of many-body quantum mechanics, the wave function approach or the density matrix picture.
The proposed workshop aims to bring together the two principal molecular quantum dynamics communities (wave-function methods and density matrix approaches). The scope is threefold, (i) to identify and explore common goals and obstacles, (ii) help in fostering new ideas to connect these approaches, and bridge the apparent gap between approximate dynamical and statistical descriptions, (iii) identify possible routes to extend dynamics approaches to the domain of statistics.
At the workshop, experts are asked to uncover the fundamental details of the methods in pedagogical lectures. These lectures will be followed by extensive discussions, during which contributed speakers and participants are welcome to put forth some of their doubts and problems in the relation between dynamics and statistics.
Further information can be at: https://www.cecam.org/workshop-1483.html
Preliminary invited speakers are:
Nandini Ananth (Cornell University, USA) Sara Bonella (CECAM, Switzerland) Irene Burghardt (Goethe University, Germany) Eitan Geva (University of Michigan, USA) E. K. U. Gross (Max-Planck Institute of Microstructure Physics, Germany) Raymond Kapral (University of Toronto, Canada) Dvira Segal (University of Toronto, Canada) Jeremy Richardson (ETH Zurich, Switzerland) Graham Worth (University College London, UK)
The local organizing committee of the Catalan Chemical Society (SCQ) cordially invites you, on behalf of the Division of Computational and Theoretical Chemistry (DCTC) of the European Association of Chemical and Molecular Sciences (EuCheMS), to participate at the 11th European Conference on Theoretical and Computational Chemistry, September 4 – September 7, 2017, in Barcelona.
The conference will reflect recent advances, developments and trends in the field and its impact on related molecular sciences and technology. EuCO-TCC 2017 will provide a unique information and communication platform and will cover a wide range of subjects related to computational chemistry, theoretical chemistry, material sciences, biology and drug design, and from fundamental academic research to industrial applications.
This invitation is addressed to scientists in academia, industry and in governmental institutions. You are all warmly welcomed to share your most recent findings and ideas and to continue the tradition of EuCO-CC conferences (Nancy 1994, Lisbon 1997, Budapest 2000, Assisi 2002, La Londe le Maures 2006, Tale 2006, Venetia 2008, Lund 2010, Sopron 2013, Fulda 2015).
Outstanding keynote speakers will outline recent trends in vary fields of interest. The scientific program will be completed by exhibitors presenting latest methods and applications in the field of computational chemistry.
The next Joint Iberian Meeting on Atomic and Molecular Physics IBER 2017 will take place in Barcelona, Spain from September 12 to 14, 2017.
IBER is the biannual conference organised jointly by the Atomic and Molecular Physics Specialised Group (GEFAM) of the Spanish Royal Society of Physics and the Portuguese Society of Physics.
The main purpose of this series of IBER conferences is to bring together scientists of Iberian community dedicated to Atomic and Molecular Physics and related areas of to facilitate the interaction and exchange of knowledge between their research groups. Researchers and scientists from all over Europe and the world are invited to attend this conference and share knowledge. The conference will be structured in three days with plenary lectures, invited lectures, oral presentations and a poster session.
For detailed information and registration please visit:
Specific topics of IBER include:
- Quantum Physics and Chemistry
- Experimental Techniques and Applied Physics
- Atomic and Molecular Spectroscopy and Structure
- Biomolecules and Biophysics
- Clusters, Nanoparticles
- Surfaces and Condensed Phases
- Dynamical Studies of Elementary Processes
- Femtochemistry and Laser Control
List of Confirmed Speakers
M. Alcamí, U. Autónoma de Madrid (Spain)
V. Aquilanti, U. de Perugia (Italy)
A. Bergeat, U. de Bordeaux (France)
F. Calegari, U. of Hamburg (Germany)
M.L. Carvalho, U. Nova Lisboa (Portugal)
D. Clary, Oxford University (UK)
B. Costa Cabral, U. Lisboa (Portugal)
L.M. Frutos, U. de Alcalá de Henares (Spain)
P. García Jambrina, U. Complutense de Madrid (Spain)
P. Jönsson, Malmö högskola, Malmö (Sweden)
U. Manthe. Universität Bielfeld (Germany)
T. Martinez, Stanford University (USA)
B. Maté, Consejo Superior de Investigaciones Científicas (Spain)
E. Narevicius, Weizmann Institute (Israel)
J. A. Paixão, U. de Coimbra, (Portugal)
M. J. Ramos, U. de Porto (Portugal)
O. Roncero, Consejo Superior de Investigaciones Científicas (Spain)
D. Shalashilin, U. of Leeds (UK)
S. Willitchs, U. Basel (Switzerland)
Registration is now open. The deadline for early-bird registration is July 6th while abstract submission will be open until June 9th. Please mark your calendars.
Approximately 10-12 contributions will be selected for oral communications. The participation of young researchers and students is particularly welcome.
We looking forward to welcoming in Barcelona!
With best regards
The Organising Committee at Universitat de Barcelona,
Antonio Aguilar Navarro (Chairman)
Margarita Albertí Wirsing
Miguel González Pérez
Fermín Huarte-Larrañaga (Secretary)
Estefanía López Marne
Josep Maria Lucas
Departament de Ciència de Materials i Química Física
Secció de Química Física
Institut de Química Teòrica i Computacional de la UB (IQTCUB)
Universitat de Barcelona
The recent development of novel light sources like x-ray free-electron lasers and table-top lasers for high-harmonic generation, which are capable of delivering controllable sequences of intense sub-femtosecond ionizing pulses, has opened the way to monitor and control electron dynamics in atoms and molecules at its natural time scale, the attosecond (Chem. Rev. 2017, DOI: 10.1021/acs.chemrev.6b00453). The description of the coherent superposition of electronic continuum states that the interaction of such pulses with molecules generates goes beyond the capabilities of standard quantum-chemistry packages, which have been designed to describe the lowest bound states. Furthermore, stationary state-based pictures based on lowest-order perturbation theory are, in most cases, inapplicable. The purpose of this school is to introduce state-of-the-art ab-initio, hybrid and TDDFT numerical methods that can cope with ultra-fast dynamics in the electronic continuum of molecules, with an emphasis on unbound states in strong-fields and on the need to go beyond single-active-electron models to properly account for electron correlation. The course is directed to advanced master students, PhD students and young post-doctoral researchers in atomic and molecular physics, theoretical chemistry and applied mathematics, with an interest in developing new software for coherent control of electronic dynamics in systems of chemical interest.
The tutorial will be organized in 5 theoretical sessions and 4 practical sessions in the computer lab. Both theoretical and practical sessions will be of 4 hours. The school comprises four didactic blocks. The first block has an introductory character. It offers an overview of the field and a tutorial on strong field physics. The following three blocks focus on systems of increasing complexity and will be devoted to the description and use of new computational methods for fast time evolution in correlated systems in non-perturbative conditions (see description below). The school will end with a comprehensive overview of state-of-the-art results in attosecond pump-probe and strong field molecular science obtained with ab initio “exact” simulations in small systems, on the one side, and with TD-DFT effective-field simulations, capable of coping with larger systems, on the other side. The future perspectives, challenges and mutual interaction of these two complementary approaches will be discussed.
More information: https://www.cecam.org/workshop-1552.html