On the role of low-frequency modes in the energy or temperature dependence of intersystem crossing

H. Kono; S. H. Lin; E. W. Schlag

doi:10.1016/0009-2614(88)80007-1

On the role of low-frequency modes in the energy or temperature dependence of intersystem crossing

H. Kono, S. H. Lin, E. W. Schlag

SCI - Chemistry

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4 Citations (Scopus)

Abstract

The strong temperature dependence of T₁→ S₀ intersystem crossing (ISC) and the energy dependence of T₁→ S₀ under collision-free conditions is semiquantitatively discussed on the basis of a model in which consideration is given to low frequency modes that undergo a large increase in frequency in going from T₁ to S₀. It is shown that such modes play a key role in the strong temperature or energy dependence. The increase in ISC rate by methylation, which has been reported for benzene and diazabenzenes in solid matrices, is explained by the assumption that the frequencies of the vibronic coupling modes are reduced more in T₁ than in S₀ because of the reduction in the T₂-T₁ energy gap by methylation.

Original language	English
Pages (from-to)	280-285
Number of pages	6
Journal	Chemical Physics Letters
Volume	145
Issue number	4
DOIs	https://doi.org/10.1016/0009-2614(88)80007-1
Publication status	Published - 1988 Apr 8

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1016/0009-2614(88)80007-1

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title = "On the role of low-frequency modes in the energy or temperature dependence of intersystem crossing",

abstract = "The strong temperature dependence of T1→ S0 intersystem crossing (ISC) and the energy dependence of T1→ S0 under collision-free conditions is semiquantitatively discussed on the basis of a model in which consideration is given to low frequency modes that undergo a large increase in frequency in going from T1 to S0. It is shown that such modes play a key role in the strong temperature or energy dependence. The increase in ISC rate by methylation, which has been reported for benzene and diazabenzenes in solid matrices, is explained by the assumption that the frequencies of the vibronic coupling modes are reduced more in T1 than in S0 because of the reduction in the T2-T1 energy gap by methylation.",

author = "H. Kono and Lin, {S. H.} and Schlag, {E. W.}",

note = "Funding Information: Terazima for their helpful discussions. This work was supported by NSF.",

year = "1988",

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T1 - On the role of low-frequency modes in the energy or temperature dependence of intersystem crossing

AU - Kono, H.

AU - Lin, S. H.

AU - Schlag, E. W.

N1 - Funding Information: Terazima for their helpful discussions. This work was supported by NSF.

PY - 1988/4/8

Y1 - 1988/4/8

N2 - The strong temperature dependence of T1→ S0 intersystem crossing (ISC) and the energy dependence of T1→ S0 under collision-free conditions is semiquantitatively discussed on the basis of a model in which consideration is given to low frequency modes that undergo a large increase in frequency in going from T1 to S0. It is shown that such modes play a key role in the strong temperature or energy dependence. The increase in ISC rate by methylation, which has been reported for benzene and diazabenzenes in solid matrices, is explained by the assumption that the frequencies of the vibronic coupling modes are reduced more in T1 than in S0 because of the reduction in the T2-T1 energy gap by methylation.

AB - The strong temperature dependence of T1→ S0 intersystem crossing (ISC) and the energy dependence of T1→ S0 under collision-free conditions is semiquantitatively discussed on the basis of a model in which consideration is given to low frequency modes that undergo a large increase in frequency in going from T1 to S0. It is shown that such modes play a key role in the strong temperature or energy dependence. The increase in ISC rate by methylation, which has been reported for benzene and diazabenzenes in solid matrices, is explained by the assumption that the frequencies of the vibronic coupling modes are reduced more in T1 than in S0 because of the reduction in the T2-T1 energy gap by methylation.

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VL - 145

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JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 4

ER -

On the role of low-frequency modes in the energy or temperature dependence of intersystem crossing

Abstract

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