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  4. A Study of the Singlet-Triplet Perturbations in the a 1au State of Acetylene by High-Resolution Ultraviolet Spectroscopy
 
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research article

A Study of the Singlet-Triplet Perturbations in the a 1au State of Acetylene by High-Resolution Ultraviolet Spectroscopy

Drabbels, Marcel  
•
Heinze, J.
•
Meerts, W. L.
1994
Journal of Chemical Physics

Laser-induced fluorescence spectra of the 3(0)3 K-0(1) and 3(0)4 K-0(1) vibronic bands of the A 1A(u) <-- X 1SIGMA(g)+ transition in acetylene have been recorded with a resolution of 18 MHz. Each rotational transition consists of a group of lines due to coupling of the electronically excited singlet state with isoenergetic triplet states. Using the standard deconvolution procedure the singlet-triplet coupling elements and the density of coupled triplet states are derived for rotational levels up to J=4 in both bands. From the density of coupled triplet states it is concluded that the A 1A(u) state is perturbed by the T1 B-3(2) state. Magnetic field measurements have shown that the predissociation of acetylene in the 4nu3' vibrational level of the A state is caused by a coupling via the T1 B-3(2) state with predissociating vibrational levels of the electronic ground state.

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Type
research article
DOI
10.1063/1.466988
Author(s)
Drabbels, Marcel  
•
Heinze, J.
•
Meerts, W. L.
Date Issued

1994

Publisher

American Institute of Physics

Published in
Journal of Chemical Physics
Volume

100

Start page

165

Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
ISIC  
Available on Infoscience
May 11, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/67226
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