Evidence for highly energetic fragments following electron capture in O5+ + H2 collisions at low impact velocities
Evidence for highly energetic fragments following electron capture in O5+ + H2 collisions at low impact velocities
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低冲击速度下 O5 H2 碰撞中电子捕获后产生高能碎片的证据
DOI：
10.1088/0953-4075/35/5/317
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
F. Frémont
中科院分区：
文献类型：
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作者：
P. Sobocinski;J. Rangama;G. Laurent;L. Adoui;A. Cassimi;J. Chesnel;A. Dubois;D. Hennecart;X. Husson;F. Frémont
测量了慢O5+和H2碰撞后H2+和H+离子反冲的角分布。从单或双电子捕获产生的反冲离子在20°-130°范围内被检测到。在弹丸速度低于0.1 au时，两组峰清晰可见。第一种结构以~9.5 eV为中心，对应于相对较大的冲击参数（b≈5 au）下的双捕获。在更高的碎片能量下，可以清楚地观察到另一种结构。后一组峰随着探测角的增大而向较低的能量方向移动。使用经典运动学方程的计算表明，这些峰值是由于在非常小的撞击参数（b<1 au）下的单次或双次捕获所致。我们的计算再现了峰值的位置，以及作为检测角度函数的相对横截面。
Angular distributions of recoiling H2+ and H+ ions following collisions of slow O5+ and H2 were measured. The recoil ions originating from single or double electron capture were detected at angles in the range 20°-130°. At projectile velocities lower than 0.1 au, two groups of peaks are clearly visible. A first structure, centred at ~9.5 eV, corresponds to a double capture at relatively large impact parameters (b≈5 au). At higher fragment energies, another structure is clearly observed. The latter group of peaks shifts towards lower energies as the detection angle increases. Calculations using classical kinematics equations show that these peaks are due to single or double capture at very small impact parameters (b<1 au). Our calculations reproduce the position of the peaks, as well as the relative cross sections as a function of the detection angle.