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

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

doi:10.1063/1.1680890

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

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

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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 language	English (US)
Pages (from-to)	4219-4222
Number of pages	4
Journal	The Journal of Chemical Physics
DOIs	https://doi.org/10.1063/1.1680890
State	Published - 1974

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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title = "Hot band transitions to the triplet state in anthracene and pyrene crystals",

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.",

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AU - Whitten, W. B.

AU - Arnold, S.

AU - Swenberg, C. E.

PY - 1974

Y1 - 1974

N2 - 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.

AB - 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.

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

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