1966
DOI: 10.1063/1.1727915
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Experimental and Theoretical Considerations for Ionization of Simple Hydrocarbons, H2, D2, O2, H2O, and the Rare Gases by 2.2-MeV α Particles and by Electrons in a Mass Spectrometer

Abstract: The measurement of ionization cross sections and mass spectra produced by 2.2-MeV α particles is briefly discussed with emphasis on experimental details which lead to results which are more accurate than those of the previous study. Experimental techniques and apparatus have been developed and applied to these measurements for H2, D2, O2, H2O, CH4, C2H2, C2H4, C2H6, and the rare gases. The experimental results for H2 and He are compared with detailed calculations in the Börn—Bethe approximation and for Ar in t… Show more

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Cited by 19 publications
(5 citation statements)
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“…3 as a function of the ion's specific energy. The CDW-EIS TCSs are compared to the measurements reported by Rudolph and Melton, 57 Bolorizadeh and Rudd, 58 Ohsawa et al, 51 and Dal Cappello et al 53 There is very good agreement between theory and experiment for H + and He 2+ , especially for the latter, but the measured TCS of 6.0 MeV/u C 6+ ions is considerably lower than the prediction of the CDW-EIS. The origin of this discrepancy remains to be understood.…”
Section: Iiia3 Tcssmentioning
confidence: 69%
“…3 as a function of the ion's specific energy. The CDW-EIS TCSs are compared to the measurements reported by Rudolph and Melton, 57 Bolorizadeh and Rudd, 58 Ohsawa et al, 51 and Dal Cappello et al 53 There is very good agreement between theory and experiment for H + and He 2+ , especially for the latter, but the measured TCS of 6.0 MeV/u C 6+ ions is considerably lower than the prediction of the CDW-EIS. The origin of this discrepancy remains to be understood.…”
Section: Iiia3 Tcssmentioning
confidence: 69%
“…8 with the experimental data of Refs. [52][53][54], as a function of the impact energy E. Good agreement is found for E 50 keV/amu, but discrepancies appear at lower E, where the underestimation of the experimental EP cross section can be attributed to the inaccurate computation, by means of the IEVM, of the many-electron probabilities that contribute to EP. On the other hand, the SI cross section, included in Fig.…”
Section: He 2+ + H 2 O Collisionsmentioning
confidence: 77%
“…Such improved initial conditions involve an electron energy distribution that spreads over the entire energy bin associated with the entry channel [57] and therefore allow us to mimic, to some extent, under-barrier [27]; purple dot-dashed line, [28]. Experimental results for EP: circles, [52]; triangles, [53]; squares, [54]. transitions, which are significant for projectile charges Z P = 1.…”
Section: He 2+ + H 2 O Collisionsmentioning
confidence: 99%
“…Total cross sections as a function of the incident projectile energy (in keV/ amu). The theoretical results are reported by solid line and compared to experimental data taken from different sources: [18] (open diamonds), [19] (open circles) and [20] (open triangles) for protons, [21] (solid down-triangles) for 3 He 2+ , [22] (solid circles) and [23] (solid up-triangle) for 4 He 2+ , [14] (solid circle) for C 6+ ions.…”
Section: Resultsmentioning
confidence: 99%