MOLECULAR EXCITED STATE DYNAMICS VIA HIGH RESOLUTION ELECTRONIC SPECTROSCOPY IN THE GAS PHASE
Dynamical processes can be studied using the high resolution spectroscopy technique. Often, the connection between dynamics and spectroscopy is the uncertainty principle ?E?t ? ?; in other cases, dynamics makes its appearance via extra rovibronic peaks, tunneling splittings, anomalous line intensities, and anomalous line broadenings. Among others, these particular spectral details are related to crucial dynamical information occurring in the molecules upon excitation. Through this work, the electronic origin and some vibronic transitions have been investigated where such phenomena are manifested. Consequently, dynamical analyses are performed to explain the apparent unique characteristics present in their experimental spectra.
The molecules studied here include 2-methoxynaphthalene, S-(+)- and R-(-)- naproxen, acenaphthene, acenaphthene-argon complex, 9,10-dihydrophenanthrene, 2-methylanisole, 3-methylanisole, 2-methylpyrimidine, 5-methylpyrimidine, dibenzothiophene, 2,5-diphenylfuran, and 2,5-diphenyl-1,3,4-oxadiazole. The results of the present work lead to interesting insights into the vibrational inversion motion, the hindered methyl group torsional motion, and some dynamical relaxation processes of selected molecules studied. In the case of naproxen, the results obtained to date shed light on the origins of optical activity.
Advisor:David H. Waldeck; Paul E. Floreancig; David N. Beratan; David W. Pratt
School:University of Pittsburgh
School Location:USA - Pennsylvania
Source Type:Master's Thesis
Date of Publication:01/18/2008