Nonadiabatic effects on the positions and lifetimes of the low-lying rovibrational levels of the GK 1Σ + g and H 1Σ + g states of H2

N. Hölsch, M. Beyer, F. Merkt

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

© 2018 The Royal Society of Chemistry.The term values of rovibrational levels of the GK 1Σ+g and H 1Σ+g states of H2 have been measured with absolute and relative accuracies down to 10-4 cm-1 (≈3 MHz) and 10-6 cm-1 (≈30 kHz), respectively, by measuring transitions to long-lived high-n Rydberg states using single-mode cw laser radiation and a collimated supersonic beam of cold H2 molecules. The term values are compared with those determined in earlier experimental and theoretical investigations and the comparison points at discrepancies and a need for improved theoretical treatments of nonadiabatic, relativistic and radiative corrections for these states. The lifetimes of several low-lying rovibrational levels of the GK, H and I+ 1Πg states have been determined in pump-probe experiments. These lifetimes reveal a significant dependence on the electronic, vibrational and rotational excitation and also deviate from results obtained in earlier experimental and theoretical investigations.
Original languageEnglish
Pages (from-to)26837-26845
JournalPhysical Chemistry Chemical Physics
Volume20
Issue number42
DOIs
Publication statusPublished - 2018
Externally publishedYes

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