aspuru-list December 2011

aspuru-list@lists.fas.harvard.edu

27 participants
40 discussions

Start a nNew thread

[Aspuru-Guzik group list] Locking Policy

by Jacob J Krich

12 years, 4 months

[Aspuru-Guzik group list] Last post.

by Alan Aspuru-Guzik

Dear group, Sorry for spamming the mailing list. This is the only time in 6 years that we have had such an animated discussion :) Next time, we should have a scientific discussion in the list. I found a lovely solution for the worried among us: http://www.kensington.com/kensington/us/us/p/1479/K64625WW/laptop-locking-s… Again, happy to buy this puppy for anybody, or regular cable locks that allow for more laptop mobility. Therefore, those that are truly concerned, could be happy, while the rest of the group, including me, is happy with open doors. Of course, I am willing to listen to the outcome of the discussion, Cheers from Mexico, and back to work on a paper, Alan Alán Aspuru-Guzik | Associate Professor Harvard University | Department of Chemistry and Chemical Biology 12 Oxford Street, Room M113 | Cambridge, MA 02138 (617)-384-8188 | http://aspuru.chem.harvard.edu | http://about.me/aspuru

12 years, 4 months

[Aspuru-Guzik group list] Locking discussion - tomorrow at 11:50

by Jacob J Krich

The first Aspuru-Guzik group summit on door locking will occur 10 minutes before group meeting (at 11:50 tomorrow). Our goal will be to determine a draft locking protocol, leading to a framework treaty, to come into legal force no later than 2020. Uninterested parties (from the US, China, India, and Canada) can show up at the usual time for group meeting, which will proceed uninterrupted. Anyone out of town can give their opinion to the list. Silence and/or not showing up will be interpreted as indifference to the outcome, indifference to the plight of the polar bear, and generally as having better things to do with one's time. As I suggested on Friday, we do not need to choose between the options on the doodle poll. Hybrid solutions may achieve greater harmony. We also do not necessarily need the same solution for each office, so we have a lot of flexibility. Best, Jacob

12 years, 4 months

[Aspuru-Guzik group list] FW: SEMINAR: Center for Excitonics , TODAY Dec 13, 3 pm, 34-401A

by Cathy Bourgeois

Center for Excitonics Seminar Series Tuesday, Dec. 13, 2011 3:00 PM - 4:00 PM EECS CONFERENCE ROOM: 34-401A "Singlet Exciton Fission in Polyacenes: Photophysics and Photovoltaic Applications" Mark Wilson, Optoelectronics Group, University of Cambridge abstract The development of novel technologies for harvesting solar energy is a major contemporary research effort in the physical sciences. However, the efficiency of any single-bandgap photovoltaic device under solar irradiation has a fundamental limit because sub-bandgap photons are not absorbed and the excess energy of super-bandgap photons is wasted as heat. An attractive method to circumvent this limit is to sensitize a 'red-absorbing' solar cell with a 'blue-absorbing' material which generates multiple electron-hole pairs. This is possible in some organic semiconductors via 'singlet fission', where a spin-singlet bound electron-hole pair (exciton) 'splits' to form two triplet excitons, each with roughly half of the singlet energy. Although singlet fission has been historically observed in molecular crystals, we recently used transient absorption spectroscopy to demonstrate that it occurs rapidly (~70 fs) and efficiently (>85%) in easily-fabricated evaporated films of pentacene and that fission-generated triplet excitons undergo long-range diffusion (>40nm) and are dissociated at a pentacene/C60 heterointerface. These results are consistent with reported photon-to-electron quantum efficiencies that exceed 100% and have led us to fabricate a proof-of-concept photovoltaic device where an evaporated pentacene film absorbs visible light and generates pairs of triplets via fission, while a second layer of inorganic colloidal quantum dots generates charge from transferred triplets as well as directly-absorbed infrared photons. Further transient absorption measurements address the mechanism of exciton fission, as questions remain as to whether singlet fission is also rapid and efficient larger-bandgap acenes and whether fission is mediated by a 'dark' (one-photon inaccessible) multiexcitonic state. Bio Hailing from Port Colborne, Canada, Mark received a B.A. (History) (2008), and a B.Sc. (2006) and M.Sc. (2008) in Engineering Physics from Queen's University, Kingston. Working with Prof. James Fraser, his thesis concerned the ultrafast dynamics of photoluminescence from individual, air-suspended, single-walled carbon nanotubes. He is presently working towards a Ph.D. in Physics under the supervision of Sir Richard Friend at the University of Cambridge's Cavendish Laboratory. The Center for Excitonics is an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science and Office of Basic Energy Sciences Light refreshments will be served

12 years, 4 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] Group meeting by Joel tomorrow

by Joel Yuen

When: Tomorrow Wednesday Dec 14th 12-1 PM Where: Cabot Division Room at Mallinckrodt What: Joel is up for group meeting: "*A witness for excitonic vs vibrational coherences * The study of the excitonic network in the FMO complex is exciting because apparently it supports long lived excitonic coherences. The direct experimental evidence is from oscillations in 2D spectroscopy. However, vibrational coherences also exhibit similar experimental signatures. Whereas there is some body of evidence indicating that the quantum beats are due to excitonic coherences (beating frequencies, computational simulations), an experimental witness that can distinguish these two types of quantum superpositions is required. In my talk, I'll show how ideal broadband pump-probe experiments do the trick, and will discuss how this can be approximated in nonideal situations". -- Joel Yuen-Zhou PhD candidate in Chemical Physics Harvard University CCB, 12 Oxford St. Mailbox 107, Cambridge, MA, USA. _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu https://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

12 years, 4 months

[Aspuru-Guzik group list] NNIN/C conference on energy

by Anna B. Shin

Dear Group, Attached is the announcement for the NNIN/C energy conference that Mike Stopa is organizing. Alan is a co-organizer and registration is free but you have to register online. Please contact Mike if you have any questions. Regards, Anna Anna B. Shin Laboratory Administrator | Aspuru-Guzik Research Group Department of Chemistry and Chemical Biology | Harvard University 12 Oxford Street | Cambridge, MA 02138 617.496.9964 office | 617.694.9879 cell | 617.496.9411 fax http://aspuru.chem.harvard.edu/

12 years, 4 months

[Aspuru-Guzik group list] food in lounge

by Anna B. Shin

Sandwiches, wraps, and salad - oh my! Anna B. Shin Laboratory Administrator | Aspuru-Guzik Research Group Department of Chemistry and Chemical Biology | Harvard University 12 Oxford Street | Cambridge, MA 02138 617.496.9964 office | 617.694.9879 cell | 617.496.9411 fax http://aspuru.chem.harvard.edu/ <https://mail.google.com/mail/u/0/?ui=2&ik=e7480c62f0&view=att&th=12eee19970…>

12 years, 4 months

[Aspuru-Guzik group list] Invitation.

by Alan Aspuru-Guzik

Dear group members, I just received an invitation to speak at this conference in Guanajuato. Yo don't need to be a spanish speaker to go on my behalf. All topics are in computational physics, so projects like CEP, TDDFT, Excitonics, etc. that use a lot of computer time are encouraged to ask me for the slot. Best, Alan Alán Aspuru-Guzik | Associate Professor Harvard University | Department of Chemistry and Chemical Biology 12 Oxford Street, Room M113 | Cambridge, MA 02138 (617)-384-8188 | http://aspuru.chem.harvard.edu | http://about.me/aspuru ---------- Forwarded message ---------- From: Alonso Ramirez <alram(a)cimat.mx> Date: Mon, Dec 12, 2011 at 10:44 AM Subject: ISUM 2012 To: alan(a)aspuru.com Estimado Alan, Nos conocimos en el QUITEL, espero que hayas tenido un buen regreso a casa. Me gustó mucho las cosas que haces en química computacional. Me permito mandarte abajo la información del congreso de supercómputo ISUM-2012, por si tu o alguno de tus colegas estudiantes están interesados en exponer acá en Guanajuato en un track que estamos organizando de química teórica y computacional. Afectuosos saludos Dr. Alonso Ramírez Manzanares Depto. de Matemáticas U. de Gto. Tel. (473) 102 6102, ext. 1206 *Abstract submission and registration for ISUM 2012 are still open! **Please check the new dates below!* **** The conference will include a special track for Supercomputing Applications on Computational Chemistry, Theoretical Chemistry and Computational Biology.**** * * *** A great set of keynote speakers are now confirmed: http://datos.langebio.cinvestav.mx/~isum/index.php?option=com_content&task=… ** High quality workshops are available: http://datos.langebio.cinvestav.mx/~isum/index.php?option=com_content&task=… Dear colleagues and friends, We are delighted to announce that the *3rd International Supercomputing Conference in Mexico (ISUM 2012: Where Supercomputing Science and Technologies Meet www.isum.mx**)* will take place during *March 13th-16th 2012*<http://datos.langebio.cinvestav.mx/%7Eisum/index.php?option=com_content&tas…>, in the city of Guanajuato<http://datos.langebio.cinvestav.mx/%7Eisum/index.php?option=com_content&tas…>, Guanajuato, México, at the *Camino Real Hotel*<http://datos.langebio.cinvestav.mx/%7Eisum/index.php?option=com_content&tas…> as venue. The program will include workshops<http://datos.langebio.cinvestav.mx/%7Eisum/index.php?option=com_content&tas…> , plenary lectures<http://datos.langebio.cinvestav.mx/%7Eisum/index.php?option=com_content&tas…> , platform session talks, and poster presentations<http://datos.langebio.cinvestav.mx/%7Eisum/index.php?option=com_content&tas…>. There also will be Industry exhibits from top High Performance Computing world companies. **** The conference will include a special track for Supercomputing Applications on Computational Chemistry, Theoretical Chemistry and Computational Biology. **** The conference will be held within the *golden tourist season in Guanajuato*. The city is one of the most beautiful places in the country, with a rich history and first class facilities. During centuries, a major mining centre, now a government seat and college town. Since 1988, a UNESCO World Heritage Site, Guanajuato has no traffic lights or neon signs, creating an extremely enjoyable place to walk, peaceful yet with plenty of life in the streets and a lot to see. The city is nestled in the stunning mountains of the Sierra de Guanajuato, and is conveniently located in the center of the state of Guanajuato<http://www.explorandomexico.com/photos/maps/full-guanajuato_l.gif>, close to San Miguel de Allende, Dolores Hidalgo, Leon and Queretaro. *Abstract submission and registration for ISUM 2012 are still open!* This year we are expecting works related to: Scientific Applications (Chemistry, Physics, Biology, Astronomy, etc.), Technological Applications, Architectures, Parallel Processing, Scientific and Industrial Visualisation, Grids, Infrastructure, Connectivity, GPUs, Networking, Data Mining, Storage, Cloud Computing, Virtualization, Communication, among others. It is encouraged that all participants send their work* in extenso<http://datos.langebio.cinvestav.mx/%7Eisum/index.php?option=com_content&tas…> *. Top 20-30 papers could be published either in Computación y Sistemas<http://www.ejournal.unam.mx/acerca_revista.html?r=7&liga=2> or Acta Universitaria<http://www.actauniversitaria.ugto.mx/estructura/index.asp> journals as *proceedings of the meeting*. Please mark your calendar for this event and feel free to visit the website at http://www.isum.mx for detailed information or to register for the meeting<http://datos.langebio.cinvestav.mx/%7Eisum/index.php?option=com_content&tas…> . We look forward to seeing you at the 3rd ISUM in Guanajuato! *Important NEW and FINAL deadlines* *Abstract Submission* December 15th, 2011 *Notification of Abstract Acceptance* January 15th, 2012 *Early Registration* January 27th, 2012 *Article in extenso* Frebuary 1st, 2012 *Exhibitor booth selection opens* October 1s, 2011 *Deadline for Cancellation* February 5th, 2012 * * With our best regards, Organising Committee ISUM 2012 *www.isum.mx* Mauricio Carrillo Tripp - Langebio <http://www.langebio.cinvestav.mx/> Cinvestav <http://www.cinvestav.mx/> Unidad Irapuato<http://ira.cinvestav.mx/> Salvador Botello Rionda - Centro de Investigación en Matemáticas A.C. Guanajuato <http://www.cimat.mx/> Alonso Ramírez, Ramón Castañeda Priego, Gerardo Valdés Vázquez - Universidad de Guanajuato <http://www.ugto.mx/> isum.2012(a)isum.mx callforpapers2012(a)isum.mx <%20%20callforpapers2012(a)isum.mx> patrocinio.2012(a)isum.mx <%20patrocinio.2012(a)isum.mx>

12 years, 4 months

[Aspuru-Guzik group list] SEMINAR: Center for Excitonics , TOMORROW. Dec 13, 3 pm, 34-401A

by Cathy Bourgeois

Please post and forward to your groups (please note seminar location) - thanks Center for Excitonics Seminar Series Tuesday, Dec. 13, 2011 3:00 PM - 4:00 PM EECS CONFERENCE ROOM: 34-401A "Singlet Exciton Fission in Polyacenes: Photophysics and Photovoltaic Applications" Mark Wilson, Optoelectronics Group, University of Cambridge abstract The development of novel technologies for harvesting solar energy is a major contemporary research effort in the physical sciences. However, the efficiency of any single-bandgap photovoltaic device under solar irradiation has a fundamental limit because sub-bandgap photons are not absorbed and the excess energy of super-bandgap photons is wasted as heat. An attractive method to circumvent this limit is to sensitize a 'red-absorbing' solar cell with a 'blue-absorbing' material which generates multiple electron-hole pairs. This is possible in some organic semiconductors via 'singlet fission', where a spin-singlet bound electron-hole pair (exciton) 'splits' to form two triplet excitons, each with roughly half of the singlet energy. Although singlet fission has been historically observed in molecular crystals, we recently used transient absorption spectroscopy to demonstrate that it occurs rapidly (~70 fs) and efficiently (>85%) in easily-fabricated evaporated films of pentacene and that fission-generated triplet excitons undergo long-range diffusion (>40nm) and are dissociated at a pentacene/C60 heterointerface. These results are consistent with reported photon-to-electron quantum efficiencies that exceed 100% and have led us to fabricate a proof-of-concept photovoltaic device where an evaporated pentacene film absorbs visible light and generates pairs of triplets via fission, while a second layer of inorganic colloidal quantum dots generates charge from transferred triplets as well as directly-absorbed infrared photons. Further transient absorption measurements address the mechanism of exciton fission, as questions remain as to whether singlet fission is also rapid and efficient larger-bandgap acenes and whether fission is mediated by a 'dark' (one-photon inaccessible) multiexcitonic state. Bio Hailing from Port Colborne, Canada, Mark received a B.A. (History) (2008), and a B.Sc. (2006) and M.Sc. (2008) in Engineering Physics from Queen's University, Kingston. Working with Prof. James Fraser, his thesis concerned the ultrafast dynamics of photoluminescence from individual, air-suspended, single-walled carbon nanotubes. He is presently working towards a Ph.D. in Physics under the supervision of Sir Richard Friend at the University of Cambridge's Cavendish Laboratory. The Center for Excitonics is an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science and Office of Basic Energy Sciences Light refreshments will be served

12 years, 4 months

[Aspuru-Guzik group list] [Aspuru-meetings-list] group meeting this week postponed to tue or wed

by Joel Yuen

hi all, on monday we won't have group meeting (it was my turn, but i need to proctor an exam for chem 160 at that time, and nobody was available for replacement). hence, we will have our group meeting on tuesday or wednesday. specific time and place tba. -- Joel Yuen-Zhou PhD candidate in Chemical Physics Harvard University CCB, 12 Oxford St. Mailbox 107, Cambridge, MA, USA. _______________________________________________ Aspuru-meetings-list mailing list Aspuru-meetings-list(a)lists.fas.harvard.edu https://lists.fas.harvard.edu/mailman/listinfo/aspuru-meetings-list

12 years, 4 months

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

aspuru-list December 2011