The phosphorescence excitation spectrum of jet-cooled 4-H-1-benzopyrane-4-thione

A. A. Ruth; F. J. O'Keeffe; R. P. Brint; M. W.D. Mansfield

doi:10.1016/S0301-0104(97)00028-1

The phosphorescence excitation spectrum of jet-cooled 4-H-1-benzopyrane-4-thione

A. A. Ruth
, F. J. O'Keeffe
, R. P. Brint
, M. W.D. Mansfield

School of Physics

Research output: Contribution to journal › Article › peer-review

Abstract

The phosphorescence excitation spectrum of isolated 4-H-1-benzopyrane-4-thione molecules (BPT) in a pulsed supersonic jet was investigated by direct excitation of the first excited triplet state, S₀ → T₁. The electronic origin at 15828 cm^-1 is assigned to the transition S_0,0 → T_1z,0, the transition S_0,0 ⇌ T_1(xy),0 is too weak to be detected with this method. The triplet lifetime τ_T1z,0 ≈ 11 μs is compatible with extrapolated values for BPT in dilute solutions. Vibronic transitions S_0,0 → T_1z,v were measured up to ∼ 1940 cm^-1 above the origin; the vibrational structure of T₁ was compared with the vibrational structure of S₂. S_0,0 → S_1,v absorptions were not observed in the laser-induced phosphorescence experiment. Hot bands were observed under specific experimental conditions.

Original language	English
Pages (from-to)	83-98
Number of pages	16
Journal	Chemical Physics
Volume	217
Issue number	1
DOIs	https://doi.org/10.1016/S0301-0104(97)00028-1
Publication status	Published - 15 Apr 1997

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title = "The phosphorescence excitation spectrum of jet-cooled 4-H-1-benzopyrane-4-thione",

abstract = "The phosphorescence excitation spectrum of isolated 4-H-1-benzopyrane-4-thione molecules (BPT) in a pulsed supersonic jet was investigated by direct excitation of the first excited triplet state, S0 → T1. The electronic origin at 15828 cm-1 is assigned to the transition S0,0 → T1z,0, the transition S0,0 ⇌ T1(xy),0 is too weak to be detected with this method. The triplet lifetime τT1z,0 ≈ 11 μs is compatible with extrapolated values for BPT in dilute solutions. Vibronic transitions S0,0 → T1z,v were measured up to ∼ 1940 cm-1 above the origin; the vibrational structure of T1 was compared with the vibrational structure of S2. S0,0 → S1,v absorptions were not observed in the laser-induced phosphorescence experiment. Hot bands were observed under specific experimental conditions.",

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T1 - The phosphorescence excitation spectrum of jet-cooled 4-H-1-benzopyrane-4-thione

AU - Ruth, A. A.

AU - O'Keeffe, F. J.

AU - Brint, R. P.

AU - Mansfield, M. W.D.

PY - 1997/4/15

Y1 - 1997/4/15

N2 - The phosphorescence excitation spectrum of isolated 4-H-1-benzopyrane-4-thione molecules (BPT) in a pulsed supersonic jet was investigated by direct excitation of the first excited triplet state, S0 → T1. The electronic origin at 15828 cm-1 is assigned to the transition S0,0 → T1z,0, the transition S0,0 ⇌ T1(xy),0 is too weak to be detected with this method. The triplet lifetime τT1z,0 ≈ 11 μs is compatible with extrapolated values for BPT in dilute solutions. Vibronic transitions S0,0 → T1z,v were measured up to ∼ 1940 cm-1 above the origin; the vibrational structure of T1 was compared with the vibrational structure of S2. S0,0 → S1,v absorptions were not observed in the laser-induced phosphorescence experiment. Hot bands were observed under specific experimental conditions.

AB - The phosphorescence excitation spectrum of isolated 4-H-1-benzopyrane-4-thione molecules (BPT) in a pulsed supersonic jet was investigated by direct excitation of the first excited triplet state, S0 → T1. The electronic origin at 15828 cm-1 is assigned to the transition S0,0 → T1z,0, the transition S0,0 ⇌ T1(xy),0 is too weak to be detected with this method. The triplet lifetime τT1z,0 ≈ 11 μs is compatible with extrapolated values for BPT in dilute solutions. Vibronic transitions S0,0 → T1z,v were measured up to ∼ 1940 cm-1 above the origin; the vibrational structure of T1 was compared with the vibrational structure of S2. S0,0 → S1,v absorptions were not observed in the laser-induced phosphorescence experiment. Hot bands were observed under specific experimental conditions.

UR - https://www.scopus.com/pages/publications/0031569667

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DO - 10.1016/S0301-0104(97)00028-1

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AN - SCOPUS:0031569667

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SP - 83

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JF - Chemical Physics

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ER -

The phosphorescence excitation spectrum of jet-cooled 4-H-1-benzopyrane-4-thione

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