Vibrational Surface Spectroscopy of Liquid, Interfaces with Nanometer Depth Resolution
- PC Online Talk
- Date: Jan 28, 2021
- Time: 11:00 AM (Local Time Germany)
- Speaker: Dr. Martin Thämer
- FHI Department PC

Despite decades of intensive research,
our current understanding of such interfaces on a molecular level is
still very limited and mainly based on results from theory, such as
molecular dynamics simulations. Prominent but still unanswered questions
concern e.g. the spatial extend of the interfacial region, which is
given by the length scale of preferential molecular orientation, the
altered strength of molecular interactions, and the role of electric
fields which arise from surface potentials.
In
this talk I will present a new experimental approach to address these
questions by adding nanometer depth resolution to phase resolved
vibrational Sum Frequency Generation (SFG) spectroscopy. In the first
part of the talk the basic concept of the technique will be shown along
with the underlying physics governing second order nonlinear
light-matter interactions. In the second part the results of several
measurements on model systems and on the highly relevant D2O-air
interface are presented and discussed, which illustrate the accuracy of
the method and give a promising perspective for future experiments.
https://zoom.us/j/98328165897?pwd=YWVsRGIxZGZ2d05ESDdiL3NkNklNUT09
Meeting-ID: 983 2816 5897
Passcode: 596114