Laser-induced (5145??) B?1?u?X?1?+g fluorescence of Na2

Laser-induced emission of the Na2 molecule consisting of discrete molecular fluorescence series was observed in the gas phase at an excitation wavelength of 5145.308?? from an argon-ion laser. Eighteen fluorescence series for the B?1?u?X?1?+g band system have been observed and analysed. Several fluorescence series are reported for the first time. The radiative transition probabilities for the observed fluorescence series were calculated using experimentally based hybrid potential energy curves for the B?1?u and X?1?+g states constructed up to dissociation and a B-X transition dipole moment function. Radiative lifetimes for the rovibrational levels of the upper states pumped by the laser line have also been calculated. The transition probabilities and lifetimes agree with the corresponding observed measurements usually within the experimental uncertainty. A strong rotational satellite structure, with jumps with ?J' = ?1,?2,...,?16 in some cases, for the most intense bands of several fluorescence series was also analysed. Absolute integral cross sections for collision-induced rotational transitions, when Na2*(v',J') in the B?1?u state collides with Na atoms, for some v'-v'' vibrational bands of intense fluorescence series, are also reported.