Franck-Condon Factors and Analysis of Several Electronic Systems of C2

The D1Sigma+u-X1Sigma+g (Mulliken) and E1Sigma+g-A1Piu (Freymark) systems of C2 have been analyzed. Molecular constants have been determined for the D1Sigma+u and E1Sigma+g states. Using these molecular constants, Franck-Condon factors (FCFs) have been calculated for the previously observed Mulliken and D1Sigma+u-B'1Sigma+g band systems. FCFs for two new electronic transitions, D1Sigma+u-C1Pig and E1Sigma+g-D1Sigma+u, have also been calculated. Knowledge of FCFs will help spectroscopists in the search for and identification of these bands. Copyright 1998 Academic Press.