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OSSC December Meeting: Molecular Vibrations Imaged for the First Time
Wednesday, December 11, 2019
Sean M Wilson
OSSC Regular Meeting
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Presentation: Molecular Vibrations Imaged for the First Time
OSSC Corporate Table Top Exhibit Reservation
Annual Corporate Member Appreciation Event
Featuring a Presentation on:
Molecular Vibrations Imaged for the First Time
Professor V. Ara Apkarian,
Director of UC Irvine’s Center for Chemistry at the Space-Time Limit (CaSTL)
Abstract: The internal vibrations of molecules drive the structural transformations that underpin chemistry and cellular function. While vibrational frequencies are measured by spectroscopy, the normal modes of motion are inferred through theory because their visualization would require microscopy with ångström-scale spatial resolution nearly three orders of magnitude smaller than the diffraction limit in optics. Using a metallic tip to focus light and taking advantage of the surface-enhanced Raman effect to amplify the signal from individual molecules, tip-enhanced Raman spectromicroscopy (TER-SM) reaches the requisite sub-molecular spatial resolution, confirming that light can be confined in picocavities and anticipating the direct visualization of molecular vibrations. Here, by using TER-SM at the precisely controllable junction of a cryogenic ultrahigh-vacuum scanning tunneling microscope, we show that ångström-scale resolution is attained at subatomic separation between the tip atom and a molecule in the quantum tunneling regime of plasmons. We record vibrational spectra within a single molecule, obtain images of normal modes and atomically parse the intramolecular charges and currents driven by vibrations. Our analysis provides a paradigm for optics in the atomistic near-field.
About our Speaker: V. Ara Apkarian is a Professor of Chemical Physics at UCI and Director of the NSF Center for Chemical Innovation on Chemistry at the Space-Time Limit (2007-present). He holds B.S. and Ph.D. degrees in Chemistry from USC and Northwestern, respectively. Following a postdoctoral fellowship in Cornell, he joined the Chemistry faculty at UCI in 1983.*nbsp; He has served as Department Chair (2004-2007) and as the founding co-Director of the Chemical and Materials Physics (ChaMP) program at UCI (1997-2000
Reception & Corporate Member Exhibits:: 6:00pm
Members: $40 Non-Members: $45
OSSC Student Members: $20