Etude de l'ionisation penning de l'hydrogene moleculaire mise en evidence d'une reaction secondaire

Tuffin, F.; Nadan, A. Le; Peresse, J.

doi:10.1016/0375-9601(84)90485-7

Cited by 2 publications

(1 citation statement)

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“…Electron energy spectrum for He*(2~S, 23S)+H2(v"=0) Penning ionization, measured with apparatus II, fit calculation of the vibrational peaks (smooth curves), and residuals between data and sum fit pact of scattered metastabtes (see also, e.g., [9]. Comparison with the earlier PIES data [7,14], which exhibit much higher background below the true gas phase PIES signal, leads to the conclusion that any broad underlying "background", which might be due to gas phase ionization processes, as discussed by Tuffin et al at some length [14,46], is a negligible component under single collision conditions, as realized in the present work. The mixed He*(21S, 23S)+H2 spectrum, measured in apparatus II with an effective resolution of about 35 meV (FWHM) and presented in Fig.…”

Section: Experimental Spectra and Data Analysismentioning

confidence: 95%

Detailed electron spectrometric study of the ionization of H2 by He* (21 S, 23 S)

Bregel

Yencha

Ruf

et al. 1989

Z Phys D - Atoms, Molecules and Clusters

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The energy spectra of electrons released in thermal energy (~ 50 meV) ionizing collisions of He* (2 iS, 23S) with H 2 have been measured with high resolution and low background. Based on a detailed data analysis, we report accurate H~ (v') vibrational populations P(v') for both He*(21S)+Hz (v'=O-lO) and He*(23S)+H2(v'=0-15) and the spectral shape S(e) for the individual vibrational peaks. The vibrational populations P(v') are quite similar to the Franck-Condon factors fv, 0 for unperturbed H 2 (v" = 0) "-~ H + (v') transitions, but, more in detail, the ratios P(v')/f~,o show a characteristically different v'-dependence for He*(23S), He*(21S), and HeI~(58.4 nm) ionization. The vibrational level separations in the He*(21S, 23S) + H 2 spectra agree with those in the HeI photoelectron spectrum to within 1-2 meV. The spectral shapes S(e) are characteristically different for He* (2 tS)+ H 2 and He* (23S) + H2, reflecting the respective differences in the entrance channel potentials, as determined previously in ab initio calculations and from scattering experiments.

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