Infrared Helium Nanodroplet Isolation Spectroscopy of the NO2 and CH4 Chemical Systems

Fehnel Jr., Robert Raymond, Department of Chemistry, University of Virginia
Lehmann, Kevin, Department of Chemistry, University of Virginia
Pate, Brooks, Department of Chemistry, University of Virginia
Egorov, Sergei, Department of Chemistry, University of Virginia

Helium nanodroplet isolation spectroscopy is a powerful tool for studying molecules without having a large interaction between the host and the dopant. It is also able to act as a reaction vessel which was the inspiration for some of the work presented. In this thesis the infrared spectra of NO 2 and its van der Waals complexes with H 2 O, N 2 , and O 2 are shown. The series of methane and its deuterated derivatives inside of helium nanodroplets are also reported. These were acquired by using a bolometer to measure beam depletion. The molecules were excited with light produced by an Acculight continuous wave OPO in the 3.2 – 3.9 m region. Saturation experiments, employing a Perry Cell, examining the NO 2  1 + 3 R(0) line and the CH 4  3 R(0) will also be reported. Finally the microwave gas phase spectra of trans-N 2 O 4 will be presented. The ab initio structure is shown and its good agreement with the experimentally determined structure. This is the first time that N 2 O 4 has been reported in the gas phase.

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PHD (Doctor of Philosophy)
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