Velocity dependence of stabilized double electron capture in N⁷⁺-Ar collisions

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• 作者：Martin ; S. ; Bernard ; J. ; Denis ; A. ; Dé ; sesquelles ; J. ; Chen ; L. ; Ouerdane ; Y.
• 刊名：Nuclear Instruments and Methods in Physics Research Section B ; Beam Interactions with Materials and Atoms
• 出版年：1995
• 期刊代码：42_0168583x
• 类别：ph
• 出版时间：May, 1995
• 卷：98
• 期：1-4
• 页码：270-274
• 文件大小：331 K

摘要

We have studied the two-electron processes in the collision of N⁷⁺ with argon at various energies. We have measured the radiative stabilization P_rad, defined as the ratio of the true double capture σ_TDC to the total double capture which is the sum of σ_TDC and the autoionizing double capture σ_ADC. A large enhancement of P_rad (17-44%) with decreasing projectile velocity (0.6-0.14 a.u.) has been found. On the other hand, by using the photon-ion coincidence technique to select the double capture processes, we have observed an increase of the emission cross sections of optical transitions from (3, n) Rydberg states with decreasing projectile energy. We give a tentative explanation which is based on a combination of autotransfer to Rydberg states and the postcollisional "satellisation" of the Rydberg electron described by Roncin and Kazansky.