Charge exchange between multicharged ions of C, N, and O and molecular hydrogen

Abstract

Cross sections for single-and double-electron capture have been measured for incident ions of C, N, and 0 with initial charges + 3 to + 6 colliding with molecular hydrogen at velocities between 0.3 X 10 and 1.2 X 10 cm/sec. The single-electron-capture cross sections for a particular incident charge are nearly constant with changing velocity. The single-capture cross sections range from about 7 X 10 ' cm' for + 3 incident ions to 40X 10 ' cm for +6 incident ions. Double-electron-capture cross sections are roughly one order of magnitude smaller. The data are qualitatively interpreted on the basis of the molecular potential-curve model for slow collisions.

Vibrationally resolved charge transfer ofO3+with molecular hydrogen

“…The q, q − 1 results of Okuno et al [27], Afrosimov et al [24], and Phaneuf et al [23], for energies between 60 eV/u and 200 eV/u, fall between the EA and VSA calculations. The IOSA and VSA results are in good agreement with the SEC measurements of Beijers et al [26] and the q, q − 1 measurements of Crandall et al [20] and Phaneuf et al [23] for E Ͼ 250 eV/ u Concerning the results of Beijers et al [26], photon energy spectroscopy of the product ions was used to determine absolute state-selective cross sections. In principle, if the emission from the dominant capture channels could be measured, then the total cross section could be obtained from the sum of the state-selective cross sections.…”

“…The group at Oak Ridge National Laboratory (ORNL) [20][21][22][23] measured the total single charge transfer cross section from 42 eV/u to 10 keV/u. Afrosimov et al [24] obtained a total cross section at 0.8 keV/u of 1.8ϫ 10 −15 cm 2 , which is about twice the cross section measured by the ORNL group.…”

“…Recommendation: Janev et al[44] (thin longdashed curve). Experiment: Crandall et al[20] (open diamonds), Afrosimov et al[24] (filled diamonds), Phaneuf et al[21] (open triangles down), Phaneuf et al[23] (filled triangles up), Beijers et al[26] (filled triangles down), Okuno et al[27] (open circles).…”

Electron-capture cross sections of multiply charged slow ions of carbon, nitrogen, and oxygen in He

“…By contrast, the MCOB calculations (DC) cannot reproduce this feature as well as the magnitude [4,23,26,30,31,[37][38][39][40].…”

Measurement and calculation of absolute single- and double-charge-exchange cross sections forO6+ions at 1.17 and 2.33 keV/u impacting He andH2

“…These are to be compared to the present measured result at 7 keV q of (1.34 ± 0.09) × 10 −15 cm 2 . Furthermore, the ratio of the single-electron-capture cross section for O 6+ impact of He to that for H 2 was found to be 0.29 ± 0.04 [34], with a ratio of 0.33 ± 0.07 extracted from earlier work [25,35] considered (8 keV q). A ratio of 0.32 ± 0.03 is found in the present work at 7 keV q.…”