Siyu Chen (Ho Group) CaSTL Seminar

Thursday, May 23, 2019 - 13:00
2201 Natural Science II Conf. Room (CaSTL Zoom Broadcast - pacific time
Siyu Chen, Graduate Student Researcher - Ho Group and Khokan Roy - UC Irvine Postdoc Apkarian Group
Event Title: 
1pm: Single molecule chemistry at space-time limit with fs-STM | 1:30pm-TBA
CaSTL Center | V. Ara Apkarian, Director


Siyu Chen | Time: 1pm

UC Irvine - Ho Group

Title: Single molecule chemistry at space-time limit with fs-STM

Bio: Siyu Chen received her bachelor’s degree in physics at Nankai University, China, 2015. She joined Prof. Wilson Ho’s group in 2015, where she has been studying the single molecule dynamics with joint fs-angstrom resolution, using a fs-laser combined scanning tunneling microscope (fs-STM).

Abstract: The investigation of single molecule dynamics with joint spatial-temporal resolution pushes the limit of measurement in nanoscale phenomena. By shining femtosecond laser pulse pairs with adjustable time delay into the junction of a scanning tunneling microscope (STM) with an adsorbed molecule on the surface, the dynamics of its chemical transformation can be followed in space-time. As an example, we probe the reversible conformational change in an isolated pyrrolidine molecule adsorbed on a Cu (100) surface. A periodic, decaying oscillation was observed in the transition rate as a function of the time delay, thereby revealing that the conformational change was coherently driven by the excitation of a particular vibrational mode in the molecule. The atomic scale resolution was demonstrated by observing the influence on the dynamics of a molecule by a nearby molecule.


Khokan Roy | Time: 1:30pm
UC Irvine, Apkarian group
Title: TBA
Bio: TBA
Abstract: TBA