Charge-transfer processes in collisions of H + ions with H 2 <mml:mo…
2000; American Physical Society; Volume: 62; Issue: 6 Linguagem: Inglês
10.1103/physreva.62.062714
ISSN1538-4446
AutoresT. Kusakabe, K Asahina, Jiang Ping Gu, Gerhard Hirsch, Robert J. Buenker, Mineo Kimura, H. Tawara, Yohta Nakai,
Tópico(s)Mass Spectrometry Techniques and Applications
ResumoCharge-transfer processes resulting from collisions of ${\mathrm{H}}^{+}$ ions with ${\mathrm{H}}_{2},$ ${\mathrm{D}}_{2},$ CO, and ${\mathrm{CO}}_{2}$ molecules have been experimentally investigated in the energy range of 0.2--4.0 keV by using the initial growth-rate method. Theoretical analysis based on a molecular-orbital expansion method for ${\mathrm{H}}_{2}$ and CO targets was also carried out. The observed cross sections are compared with previous experimental and theoretical data. The present results for ${\mathrm{H}}_{2}$ are found to be in excellent accord with the recommended data by Barnett [Oak Ridge National Laboratory Report No. ORNL-6086 (1990)], and hence, confirm the accuracy of the recommended data. But, at 0.2 keV, the present data for ${\mathrm{D}}_{2}$ are found to be smaller than those for ${\mathrm{H}}_{2}.$ For the CO molecule, the present data qualitatively agree well with most previous measurements, but show the stronger energy dependence, while the present theory shows a pronounced structure at around 0.25 keV and ties well with other low-energy measurements below 0.1 keV. For the ${\mathrm{CO}}_{2}$ molecule, the present results are in excellent accord with other measurements above 1 keV, while they show some differences below this energy where our experimental result displays the stronger energy dependence. These data are useful for various applications.
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