The dependences of the radiative lifetimes τnvNfor rovibronic levels of the h3∑g+, g 3∑g+, i3Πg +, and j3Δg+ states on the vibrational, v, and rotational, N, quantum numbers (v = 0-3 and N = 1-6) of H2 have been derived for the first time. We calculated the absolute values of τnvN in terms of a nonadiabatic model that incorporates the interaction between the (3sσ)3∑ g+, (3dσ)3∑g+, (3dπ)3Πg+, and (3dδ) 3Δg+ states by using our semiempirical expansion coefficients for the wave functions in the Born-Oppenheimer basis and the dipole moments for electronic transitions to the (2pσ) 3∑u+ and (2pπ)3Π u states. We analyze the perturbations of the radiative lifetimes for rovibronic levels of the h3∑g+, g 3∑g+, i3Πg +, and j3Δg+ states in the triplet 3s, 3d complex of H2. Considerable differences (reaching a factor of 5 for h3∑g+ and a factor of 2 for i3πg+) were found between the nonadiabatic and adiabatic radiative lifetimes of rovibronic levels. These differences can be explained both by a significant effect of the (3sσ)3∑g+ state in the i 3Πg+ perturbation and by a considerable difference (reaching an order of magnitude) between the adiabatic values of τnvN for (3sσ)3∑g+ and (3dπ)3Πg+. The differences between the nonadiabatic and adiabatic lifetimes for rovibronic levels of the g 3∑g+ and j3Δ g+ states are much smaller (no more than 11%).
|Number of pages||9|
|Journal||Optics and Spectroscopy (English translation of Optika i Spektroskopiya)|
|State||Published - 1 Sep 2002|
Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics