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SYHR: High resolution spectroscopy – modern trends and new techniques

SYHR 2: High resolution spectroscopy - modern trends and new techniques II

SYHR 2.3: Hauptvortrag

Donnerstag, 5. März 2009, 15:20–16:00, VMP 8 R05

Eigenstate-resolved electronic spectroscopy of large molecules in the gas phase. — •David W. Pratt — University of Pittsburgh, Pittsburgh PA USA

Remarkable progress has been made in the last few years in determining both the structural and dynamical properties of large polyatomic molecules and their clusters in the gas phase, and how these change when the photon is absorbed, using high resolution CW lasers operating in the UV, molecular beam machines, and rapid data analysis methods. Following a brief description of these methods, this talk will describe recent applications of this technique to several systems in which significant charge redistribution accompanies the excitation process, including hydrogen-bonded water complexes, base pairs and their mimics, and other molecules of importance to biology. These applications include studies of such spectra in the presence of applied electric fields, yielding conformer-specific values of the electric dipole moments in both electronic states.

This work has been supported by the U. S. National Science Foundation (CHE-0615755).