 |
| ||
| Laser Spectroscopy of Surfaces and Interfaces | |||
|
|
Left to right: Alex, Purnim, Mikhail, Sergey, Ian, David, Fadel, Sean Introduction Our group's research focuses on the molecular structure and dynamics of surfaces and condensed phase interfaces. Two complementary aspects of our research program are (1) development of new surface-selective laser spectroscopy techniques and (2) application of these techniques to study molecular structure (e.g., conformation), organization (orientation, packing, self-assembly), and dynamics of molecular motions in the condensed phase. We are interested in systems important in life sciences, material science, solar energy (photovoltaics), nano- and bio-technology. Read more about our research projects...
Press Coverage Our work on the hydrogen bonding at the water surface published in Nature has generated some interest in popular media. The Nature podcast with Alex describing the research in layman terms can be heard here: http://www.nature.com/nature/podcast/index-2011-06-09.html
Here are some links to popular science publications describing our work:
|
News HD-SFG study of the air-water interface in Nature 474,192 (2011) Our study of the spectral line shapes of the "free OD" mode at the air/water interface performed using broad-band heterodyne-detected sum frequency generation (HD-SFG) spectroscopy reveals that the H-bonding in the top-most layer of water molecules at the surface is only slightly weaker than bulk water H-bonds.
See "News and Views" feature by Pavel Jungwirth here: Physical chemistry: Water's wafer-thin surface Nature 474, 168-169 (2011).
Misha wins best poster award at the Anaheim ACS (March 2011) for his work on the orientational dynamics contribution to SFG spectroscopic line shapes.
SFG line shapes paper A detailed treatment of the spectral line shapes in BB-SFG (broad-band sum frequency generation) spectroscopy has appeared in J. Chem. Phys. 2010; 132, 234503. In particular, the paper deals with the effects of the time delay between the IR and visible pulses on the obtained line shape.
"Seedling" funding under the USC CEN (Center for Energy Nanoscience) Thanks to Sean's and Purnim's preliminary results on SFG spectroscopy of OPV (organic photovoltaics) films, our group has been selected for funding under the USC Center for Energy Nanoscience, an EFRC (Energy Frontiers Research Center) funded by DOE.
More studies under way...!
Recent Presentations 1/23/2012 The Organic and Hybrid PV sub-group (Purnim, David, Sean, and Alex) reported on our progress at the CEN Annual Meeting at USC. 8/18/2011 Alex gave a keynote lecture at the OpTeC Conference in Bozeman, MT 6/26-30/2011 Alex took part in the TSRC CHEM-DiCE workshop (Chemical Dynamics in Complex Environments) in Telluride, CO 5/15-17/2011 Fadel and Sergey presented posters and Alex gave a talk at the AFOSR Molecular Dynamics Meeting in Pasadena, CA. 3/26-30/2011 David, Sean, and Alex gave talks and Fadel and Misha presented porters at the ACS National Meeting in Anaheim, CA. 1/21/2011 Sergey gave a talk at the WSA (Western Spectroscopy Association) Meeting in Asilomar, CA on our work on the spectroscopy of methylated Si(111) surface and azobenzene SAMs. 12/18/2010 Alex gave a talk at the Pacifichem in Honolulu, HI, on the isotopic dilution HD-SFG spectroscopy of the air/water interface.
SciTopics article about SFG A brief review of the SFG (sum frequency generation) spectroscopy by Alex can be found on SciTopics.
Upcoming Presentations May 22-24, 2012 AFOSR Molecular Dynamics Contractors Meeting in Arlington, VA June 17-21, 2012 Telluride workshop "Nonlinear Optics at Interfaces" (co-organized by Alex and Franz Geiger, Northwestern U.) August 19-23, 2012 ACS National Meeting in Philadelphia, PA
| |
|
| |||
|
| |||
