Abstract
The excitation spectrum of the Cs2 molecule monitoring the emission from the dissociated Cs(6p2P3/2) atoms was measured by employing a pulsed supersonic molecular beam crossed with a laser beam. Strong predissociation was found in the 16 600–17 200 cm−1 region. Vibrational progressions with broad asymmetric profiles, which were found via the ionization of dissociated Cs(6p2P3/2) atoms by Kim and Yoshihara, were observed. Transitions from the ground state X 1Σg+ to the dissociative state (2)3Σu+ are allowed by the spin-orbit interaction between the (2)3Σu+ and B 1Πu states. The (2)3Σu+, (2)3Πu, and C 1Πu states are mixed by the spin-orbit interaction. By solving the coupled differential equations using the three-channel model, the transition probability to the mixed levels, (2)3Πu(v) and C 1Πu(v′) was calculated. The coupling between the (2)3Σu+ and (2)3Πu states is larger than that between the (2)3Σu+ and C 1Πu states. Accordingly, the linewidth of the (2)3Πu←X 1Σg+ transition is observed to be wider than that of the C 1Πu←X 1Σg+ transition. The sign of the Fano shape index q was shown to coincide with the sign of the vibrational overlap integral between the discrete level and the continuum.
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