Radiative transition probabilities and lifetimes for the band systems A ~2#PI#-X~2#SIGMA#~+ and C ~2#SIGMA#~+-X~2#SIGMA#~+ of the BeH molecule

摘要

Transition moment functions involving the ground electronic state and various excited doublet states of the BeH molecule are reported using highly correlated wavefunctions generated by the multi-reference single and double excitations configuration interaction approach. Radiative transition probabilities and lifetimes for the band systems A ~2#PI#-X ~2#SIGMA#~+ and C ~2#SIGMA#~+-X~2#SIGMA#~+ are also presented. Radiative lifetimes are predicted to be 81 and 163 ns for the first vibrational level of the A ~2#PI# and C~2#SIGMA#~+ states, respectively. The strongest transitions should correspond to the (0-0) and (0-8) bands of the A ~2#PI#~+-X~2#SIGMA#~+ and C~2#SIGMA#~+-X~2#SIGMA#~+ systems.