Berlin 2001 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Atomphysik
A 17: Posters Friday (Spectroscopy)
A 17.14: Poster
Freitag, 6. April 2001, 12:30–15:00, AT3
ELECTRONIC BRANCHING RATIOS FOR SPONTANEOUS EMISSION OF I−>C AND OF I −>B BAND SYSTEMS OF H2 — •Andrew Divarov1, Sergey Astashkevich1, Boris Lavrov1, and J Roepcke2 — 1Institute of Physics, St.-Petersburg State University,198904, Russia — 2INP-Greifswald, D-17489, Germany
A.A.Divarov, S.A.Astashkevich, B.P.Lavrov, J.Roepcke
More than 40 values of the branching ratios for spontaneous rovibronic transitions from electronic vibro-rotational levels I1Πg−,v′=0−2,J′=1−8 into C1Π u,v′=0−2,J′−1 and B1Σu+,vNo−dq=0−4,J′ electronic vibro-rotational levels of H2 have been measured by means of optical spectroscopy and compared with the results of ab initio calculations and semiempiric determination published early. We observed: 1) the significant discrepancy (up to 4 times) between experimental data and the results of adiabatic calculations, 2) the differences (up to 2 times) between experimental data and non-adiabatic ab initio calculations for 90 semiempiric determination of emission probabilities being in the agreement for 80 experiment. The analysis of the data shows the necessity to increase an accuracy of non- adiabatic ab initio calculations of spontaneous emission transition probabilities for the band systems under the study. This work was supported in part by Russian Foundation for Basic Research (Grant No 00-03-32922a), DFG and DAAD.