Heterodyned Vibrational Sum Frequency Generation Spectroscopy: How We Can Overcome Experimental Limitations
January 25th, 2018 MARTIN THÄMER Fritz-Haber-Institut, Berlin

In Biology and industrial processes, the most important chemistry often happens at interfaces. Nevertheless, our knowledge on molecular surface structures and their dynamics under native conditions is rather limited. Heterodyned vibrational sum frequency generation spectroscopy is a nondestructive, interface specific method that can be applied under various experimental conditions and is therefore a powerful tool for such studies. However, its implementation is a serious experimental challenge and the reliability of the obtained results is often questionable. The technical difficulties include low phase accuracy, limited spectral bandwidth and poor signal to noise ratio.

In the presentation the strengths and technical difficulties of this nonlinear spectroscopy are discussed. Finally, a new spectrometer design is presented which combines full time domain sampling with a collinear beam geometry. I will show that this approach indeed helps to overcome most of the experimental challenges while producing highly accurate complex spectra.

Seminar, January 25, 2018, 12:00. ICFO’s Seminar Room

Hosted by Prof. Jens Biegert