OBSERVATION OF INTENSITY PERTURBATIONS IN THE VACUUM ULTRAVIOLET FLUORESCENCE SPECTRUM OF MOLECULAR HYDROGEN
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Date
1974
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Ohio State University
Abstract
In the vacuum ultraviolet emission spectrum of molecular hydrogen excited by impact of monoenergetic fast electrons, intensity ratios of rotational lines originating at the same upper Level $v^{\prime}$, $J^{\prime}$ have been measured. The experimental results are compared with calculated branching ratios which take into account rotation-vibration interaction as included in the Franck-Condon factor, as well as the variation of electronic transition moment with the r-centroid of the transition $v^{\prime}$, $J^{\prime} \rightarrow$ $v^{\prime} 1$ , $J^{\prime} 1$ . Large discrepancies occur between the experimental and the calculated branching ratios for the 2p $^{1}\Sigma^{+}_{u}\rightarrow$ 1s $^{1}\Sigma^{+}_{g}$ Lyman band system. The deviations observed exhibit the typical behavior of heterogeneous perturbation by the adjacent 2p $^{1}\Pi_{u}$ electronic state.
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Author Institution: Department of Physics, Universit\..{a}t Trier-Kaisers-lautern