Jet-Cooled Molecular Spectroscopy from the Microwave to the Ultraviolet
Abstract
The present thesis shows how versatile and important the field of gas-phase spectroscopy under supersonic expansion conditions can be to understand fundamental intermolecular and intramolecular interactions. We have employed spectroscopic techniques over a very broad range spanning from microwave (2-18 GHz), through infrared (2600-4000 cm-1 ) and ultraviolet (350- 250 nm) region, studying the rotational, vibrational and electronic properties, respectively. These techniques use either chirped-pulse based (broadband rotational spectroscopy) or laser based methods (vibrational and electronic spectroscopy), and their usage depends on the types of information of particular interest and the chemical system requirements of specific techniques. The analytes are brought into the gas phase and supersonically cooled to their zero-point vibrational level to perform rotational and vibrationally resolved IR/UV spectroscopy, including conformerspecific techniques. The variety of small organic molecular systems studied include phenylcontaining hydrocarbons, water containing clusters, heteroatom containing organic molecules with and without phenyl ring, fused aromatic molecules, bichromophoric molecules and pyrolysis reaction intermediates. Apart from gaining invaluable fundamental knowledge of the various interactions, we also observe interesting quantum-physical phenomena like tunneling and large amplitude motions that provide further insight into the molecular world.
Degree
Ph.D.
Advisors
Zwier, Purdue University.
Subject Area
Energy|Mathematics|Optics
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