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Robert W. Field. Park, George Barratt, III Massachusetts Institute of Technology. Department of Chemistry. Massachusetts Institute of Technology. Department of Chemistry 2015-07-31T18:18:11Z 2015-07-31T18:18:11Z 2015 2015 http://hdl.handle.net/1721.1/97941 914232110 Thesis: Ph. D., Massachusetts Institute of Technology, Department of Chemistry, 2015. This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections. Cataloged from student-submitted PDF version of thesis. Includes bibliographical references (pages 246-262). Molecular vibrational dynamics far from equilibrium, or in the vicinity of saddle points, are of utmost importance in chemistry. However, most of the standard models used by chemists only perform well near local minima in the potential energy surface. Several spectroscopic techniques are developed and applied to the study of molecules in excited states, including chirped-pulse millimeter wave spectroscopy and adaptations of millimeter-wave optical double resonance. Models for Franck-Condon factors in the linear-to-bent S₁-S₀ transition of acetylene elucidate the dynamics of bright states observed in the fluorescence spectrum and provide insight for the design of spectroscopic schemes for accessing barrier-proximal vibrational levels. IR-UV double resonance spectroscopy enables characterization of the source of staggering in the antisymmetric stretch progression of the C̃ state of SO₂, which arises due to vibronic interactions that lead to non-equivalent equilibrium SO bond lengths. by G. Barratt Park. Ph.D. 262 pages eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Chemistry. Dynamically motivated spectroscopy of small polyatomic molecules Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="e6ea7f52-faa3-4f1a-8140-fc0da3ffc584"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Dynamically motivated spectroscopy of small polyatomic molecules</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2015</PublicationDate> <Authors> <Author> <DisplayName>Park, George Barratt, III</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Chemistry.</Keyword> <Abstract>Molecular vibrational dynamics far from equilibrium, or in the vicinity of saddle points, are of utmost importance in chemistry. However, most of the standard models used by chemists only perform well near local minima in the potential energy surface. Several spectroscopic techniques are developed and applied to the study of molecules in excited states, including chirped-pulse millimeter wave spectroscopy and adaptations of millimeter-wave optical double resonance. Models for Franck-Condon factors in the linear-to-bent S₁-S₀ transition of acetylene elucidate the dynamics of bright states observed in the fluorescence spectrum and provide insight for the design of spectroscopic schemes for accessing barrier-proximal vibrational levels. IR-UV double resonance spectroscopy enables characterization of the source of staggering in the antisymmetric stretch progression of the C̃ state of SO₂, which arises due to vibronic interactions that lead to non-equivalent equilibrium SO bond lengths.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>