Probabilities of rovibronic transitions in the I-1 Pi(-)(g), J(1)Delta(-)(g)-> C-1 Pi(u)(+/-) systems of bands of the deuterium molecule

Probabilities of spontaneous rovibronic transitions I(1)Pi (-)(g), v'J', J( 1)Delta (-)(g), v, J' --> C(1)Pi (+/-)(u), v'',J" of the D-2 molecule (for vibrational and rotational quantum numbers v '= v" = 0-3 and J' = 1-9, J" = J' +/- 1) have been obtained for the first time. They were determined usin g (I)the previously proposed nonadiabatic model, which takes into account t he electron-rotational interaction of the upper levels; (2) the coefficient s of expansion of wave functions of perturbed states in the Born-Oppenheime r basis, which were found from the experimental data on rovibronic terms; a nd (3) semiempirical ab initio data on electronic transition dipole moments of the 3d pi (1)Pi (g) ---> 2p pi (1)Pi (u) and 3d delta (1)Delta (g) --> 2p pi (1)Pi (u) transitions. The dependences of the transition probabilitie s on J' for the same bands of both hydrogen isotopomers H-2 and D-2 were fo und to be identical. They represent monotone functions for R and P branches and functions with a maximum (minimum) for Q branches. The ratios of trans ition probabilities of different isotopomers for different branches of the same systems of bands and for the same branches of different systems of ban ds were found to be correlated. The semiempirical values obtained in the pa per agree with the experimental values within the limits of the errors of t heir determination. The nonempirical values of transition probabilities agr ee with the experiment considerably worse. (C) 2001 MAIK "Nauka/Interperiod ica".