Resonance Raman studies of simple fluorinated compounds: trifluoromethyliodide and hexafluorobutadiene

Bruce S. Hudson; Mary S. C. Foley; John Paul Chan; M. Z. Zgierski

doi:10.1117/12.220854

18 September 1995 Resonance Raman studies of simple fluorinated compounds: trifluoromethyliodide and hexafluorobutadiene

Bruce S. Hudson, Mary S. C. Foley, John Paul Chan, M. Z. Zgierski

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Proceedings Volume 2548, Laser Techniques for State-Selected and State-to-State Chemistry III; (1995) https://doi.org/10.1117/12.220854
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

Fluorine substitution can have a major effect on the electronic spectra and sometimes on the ground electronic state conformations of organic compounds. In this work we investigate the effect of perfluorination on the resonance Raman spectra of the simple diene, hexafluorobutadiene where the preferred ground state geometry is believed to be skew s-cis. A detailed comparison of theory with experiment is possible and excellent agreement is observed. In an ongoing study, we investigate the effect of fluorination on the photodissociation dynamics of methyliodide by investigation of CF₃I. The activity of the CH₃ umbrella mode observed in the resonance Raman spectrum of CH₃I obtained in resonance with the dissociative A state is attributed to a change in the geometry from pyramidal to planar as the C-I bond elongates. This should not be observed in the case of CF₃I since CF₃ is pyramidal. The consequences of this fluorine effect on the photodissociation product as revealed in the resonance Raman spectrum are investigated.

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Bruce S. Hudson, Mary S. C. Foley, John Paul Chan, and M. Z. Zgierski "Resonance Raman studies of simple fluorinated compounds: trifluoromethyliodide and hexafluorobutadiene", Proc. SPIE 2548, Laser Techniques for State-Selected and State-to-State Chemistry III, (18 September 1995); https://doi.org/10.1117/12.220854

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KEYWORDS

Raman spectroscopy

Absorption

Fluorine

Molecules

Chemical species

Diffraction

Polarization

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