Vibrational Surface Spectroscopy of Liquid, Interfaces with Nanometer Depth Resolution
- PC Online Talk
- Date: Jan 28, 2021
- Time: 11:00
- 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.
Meeting-ID: 983 2816 5897