Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 17: Posters Friday (Spectroscopy)

A 17.41: Poster

Freitag, 6. April 2001, 12:30–15:00, AT3

ROVIBRONIC TRANSITION PROBABILITIES OF THE I,J −⟩ C BAND SYSTEMS OF DEUTERIUM MOLECULE — •Sergey Astashkevich and Boris Lavrov — Institute of Physics, St.-Petersburg State University, 198904, Russia

The absolute values of the transition probabilities of the I¹Π_g⁻,v′,J′, J¹Δ _u⁻,v′,J′ −⟩ C¹Π _u,v,J″ spontaneous emission of D₂ (for vibrational and rotational quantum numbers v=0-3, J’=1-9 and J”=J’-1,J’,J’+1) have been obtained for the first time. Ab initio (L.Wolniewicz, 1996) and semiempiric (S.A.Astashkevich, N.V.Kokina, B.P.Lavrov,1997) dipole moments of 3d¹Π_g, 3d¹Δ_g −⟩ 2p¹Π _u electronic transitions have been used. The calculations were made in the framework of adiabatic approximation and with original non-adiabatic model taking into account the l-uncoupling. The expansion coefficients of the perturbed wave functions over Born-Oppenheimer basis set were derived from experimental rovibronic term values (R.S.Freund et. al., 1985). It is noted the correlation between ratios of spontaneous emission probabilities of both isotopomers of hydrogen molecule (H₂ and D₂) for different branches of the same bands and different bands for the same branches. It is shown that the semiempiric data give the agreement with all experimental branching ratios of spontaneous emission probabilities of this band systems available at present time. Ab initio data are too far from an agreement. This work was supported by Russian Foundation for Basic Research (Grant No 00-03-32922a).