Hot band transitions to the triplet state in anthracene and pyrene crystals

W. B. Whitten, S. Arnold, C. E. Swenberg

Research output: Contribution to journalArticle

Abstract

The low energy end of the S0→T1 absorption spectrum has been measured in anthracene and pyrene crystals from 220 to 330°K. A transition is found in both of these systems at an energy approximately 400 cm-1 below the 0-0 energy. The temperature dependence of this absorption reveals it to be excitation of a hot vibrational level of the ground state. Polarized excitation measurements have been carried out on the hot band absorption in anthracene, and it is found that the polarization ratio between light polarized parallel and perpendicular to the 6 axis is the same as that for the 0-0 transition. In addition it is found that there is no measurable shift (within 4 cm-1) in the position of the hot band maxima for the two polarizations. Within the framework of strong and weak coupling and the Born-Oppenheimer approximation only weak coupling is found to fit all the experimental facts.

Original languageEnglish (US)
Pages (from-to)4219-4222
Number of pages4
JournalThe Journal of chemical physics
StatePublished - 1974

Fingerprint

pyrenes
anthracene
atomic energy levels
Absorption spectra
Polarization
Born approximation
Crystals
Light polarization
Ground state
crystals
absorption spectra
Born-Oppenheimer approximation
polarization
polarized light
excitation
energy
temperature dependence
ground state
shift
Temperature

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Hot band transitions to the triplet state in anthracene and pyrene crystals. / Whitten, W. B.; Arnold, S.; Swenberg, C. E.

In: The Journal of chemical physics, 1974, p. 4219-4222.

Research output: Contribution to journalArticle

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AU - Arnold, S.

AU - Swenberg, C. E.

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