The spectroscopy of jet-cooled porphyrins: An insight into the vibronic structure of the Q band

Joseph M. Beames, Timothy D. Vaden, Andrew J. Hudson

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Abstract

We will present resonant two-photon ionization spectra for meso-tetraphenylporphyrin, H 2TPP, measured under isolated conditions. The polycrystalline compound was vaporized, in vacuo, using both thermal and laser desorption, and seeded into a supersonic expansion of an inert-carrier gas. The molecules remain largely intact in the gaseous phase. However, the two techniques for vaporizing H 2TPP give different internal temperatures for the isolated substrate, with greater vibrational cooling achieved using laser desorption. A comparison of the peak positions and intensities in the resonant two-photon ionization spectra of thermal- and laser-desorbed molecules provides an insight into the vibrational structure of the Q band. In particular, the greater contribution made by electronic transitions originating from higher vibrational levels in the ground state of H 2TPP is emphasized. We conclude that vibronic coupling in the ground electronic state plays an important role in a quantum-mechanical interpretation of the Q band.

Original languageEnglish (US)
Pages (from-to)314-323
Number of pages10
JournalJournal of Porphyrins and Phthalocyanines
Volume14
Issue number4
DOIs
Publication statusPublished - Apr 2010

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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