Numéro
J. Phys. IV France
Volume 01, Numéro C7, Décembre 1991
2nd International Conference
Laser M2P
Page(s) C7-521 - C7-524
DOI http://dx.doi.org/10.1051/jp4:19917137
2nd International Conference
Laser M2P

J. Phys. IV France 01 (1991) C7-521-C7-524

DOI: 10.1051/jp4:19917137

ANTICROSSINGS IN THE ACETYLENE MOLECULE FOURIER TRANSFORM ANALYSIS : MEAN COUPLING, LEVEL DENSITY

P. DUPRE

Service National des Champs Intenses, C.N.R.S., B.P. 166X, F-38042 Grenoble cedex 9, France


Abstract
By using a home made dye laser we excite, in the U.V. range, the acetylene molecule (C2H2) in gas phase. Four rotationless vibrational levels have been selected to obtain anticrossing spectra up to 8 tesla. To statistically analyze this data we have developped a method based on a Fourier Transform (TF) technique and on a fitting of the resulting curves. This first analysis gives the probability law of the singlet-triplet coupling for the different excited levels. A second analysis allows to extract from the first analysis of the data the vibrational level densities ([MATH]), the products [MATH] and the mean couplings ([MATH]). Finally we will present the variation of the product [MATH] as an increasing exponential fonction of the excitation energy.



© EDP Sciences 1991