From water clusters to homogeneous catalysis: A savage journey to the heart of contemporary chemistry with a cryogenic photofragmentation mass spectrometer
Seminar | April 18 | 4-5 p.m. | Pitzer Auditorium, 120 Latimer Hall
The coupling between ambient ionization sources, developed for mass spectrometric analysis of biomolecules, and cryogenic ion processing, originally designed to study interstellar chemistry, creates a new and general way to capture transient chemical species and elucidate their structures with vibrational spectroscopy. Advances in non-linear optics over the past decade allow single-investigator, table top laser access to IR bands from 550 to 4000 cm-1, essentially covering the same range as a typical FTIR instrument. When vibrational spectra are acquired using predissociation of weakly bound rare gas tags, the resulting spectra are equivalent to absorption spectra and correspond to target ions at a temperature of 10K. Taken together, what emerges is a new way to add a structural component to mass spectrometric analysis. Moreover, because the spectral features of the cold ions are sharp, the evolution of bond-specific transitions can be used to follow the docking arrangements of everything from H-bonded water networks to the contact points between the constituents of ionic liquids. I will focus on whatever seems most interesting at the time!
Light refreshments at The Coffee Lab at 3:50pm