Author/Authors :
Kempgens، نويسنده , , B. S. Itchkawitz، نويسنده , , B.S. and Feldhaus، نويسنده , , J. and Bradshaw، نويسنده , , A.M. and Kِppel، نويسنده , , H. and Dِscher، نويسنده , , M. and Gadea، نويسنده , , F.X. and Cederbaum، نويسنده , , L.S.، نويسنده ,
Abstract :
The C 1s−π∗ band in the high-resolution photoabsorption spectra of the ethyne isotopomers C2H2, C2D2 and C2HD is found to be dominated by vibronic coupling effects. There is quantitative agreement between experiment and a recent theoretical model which treats vibronic coupling in both the core and valence orbital spaces. The theoretical analysis shows that a strong excitation of the bending modes dominates the observed spectra.
