The à 1B2u-X̃1Ag electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene: rotational band contour and vibrational analysis relating to non-planarity in the à state
The vapour phase electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene, in the region of the S1-S0 band system, has been photographed under conditions of high resolution. Computer simulation of the observed rotational contours has shown that all the most intense bands are type A and, theref...
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1988
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my.upm.eprints.337932015-04-20T01:19:19Z http://psasir.upm.edu.my/id/eprint/33793/ The à 1B2u-X̃1Ag electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene: rotational band contour and vibrational analysis relating to non-planarity in the à state Hollas, J. Michael Hussein, Mohd Zobir The vapour phase electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene, in the region of the S1-S0 band system, has been photographed under conditions of high resolution. Computer simulation of the observed rotational contours has shown that all the most intense bands are type A and, therefore, that the electronic assignment is A ‘B2uX1Ag. The rotational constants in the A state are consistent with an out-of-plane angle of the C-F bonds of 11+4”. This is consistent with the result obtained by Okuyama et al., from the supersonic jet spectrum, that the fluorine atoms are out-of-plane in a “butterfly” configuration. Obser- vation of hot bands of the butterfly vibration, which are frozen out in the jet spectrum, provides strong support for the W-shaped potential function proposed by Okuyama et al. for this vibration in the A state. Elsevier 1988-03-07 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/33793/1/the%20A3B2a.pdf Hollas, J. Michael and Hussein, Mohd Zobir (1988) The à 1B2u-X̃1Ag electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene: rotational band contour and vibrational analysis relating to non-planarity in the à state. Chemical Physics , 124 (2). pp. 297-303. ISSN 0301-0104 10.1016/0301-0104(88)87159-3 |
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The vapour phase electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene, in the region of the S1-S0 band system, has been photographed under conditions of high resolution.
Computer simulation of the observed rotational contours has
shown that all the most intense bands are type A and, therefore, that the electronic assignment is A ‘B2uX1Ag. The rotational constants in the A state are consistent with
an out-of-plane angle of the C-F bonds of 11+4”. This is consistent with the result obtained by Okuyama et al., from
the supersonic jet spectrum, that the fluorine atoms are out-of-plane in a “butterfly” configuration. Obser- vation of hot bands of the butterfly vibration, which are frozen out in the jet spectrum, provides strong support for the W-shaped potential function proposed by Okuyama et al. for
this vibration in the A state. |
format |
Article |
author |
Hollas, J. Michael Hussein, Mohd Zobir |
spellingShingle |
Hollas, J. Michael Hussein, Mohd Zobir The à 1B2u-X̃1Ag electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene: rotational band contour and vibrational analysis relating to non-planarity in the à state |
author_facet |
Hollas, J. Michael Hussein, Mohd Zobir |
author_sort |
Hollas, J. Michael |
title |
The à 1B2u-X̃1Ag electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene: rotational band contour and vibrational analysis relating to non-planarity in the à state |
title_short |
The à 1B2u-X̃1Ag electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene: rotational band contour and vibrational analysis relating to non-planarity in the à state |
title_full |
The à 1B2u-X̃1Ag electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene: rotational band contour and vibrational analysis relating to non-planarity in the à state |
title_fullStr |
The à 1B2u-X̃1Ag electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene: rotational band contour and vibrational analysis relating to non-planarity in the à state |
title_full_unstemmed |
The à 1B2u-X̃1Ag electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene: rotational band contour and vibrational analysis relating to non-planarity in the à state |
title_sort |
ã 1b2u-x̃1ag electronic absorption spectrum of 1,2,4,5-tetrafluorobenzene: rotational band contour and vibrational analysis relating to non-planarity in the ã state |
publisher |
Elsevier |
publishDate |
1988 |
url |
http://psasir.upm.edu.my/id/eprint/33793/1/the%20A3B2a.pdf http://psasir.upm.edu.my/id/eprint/33793/ |
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1643830972263694336 |
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13.18916 |