The competition of Penning ionization and ion pair formation in fast collisions of metastable rare gas atoms with O2 and Cl2 molecules
The competition of Penning ionization and ion pair formation in fast collisions of metastable rare gas atoms with O2 and Cl2 molecules
复制标题
亚稳态稀有气体原子与O2和Cl2分子快速碰撞中潘宁电离和离子对形成的竞争
DOI：
10.1063/1.446784
复制
发表时间：
1984
影响因子：
4.4
通讯作者：
V. Kempter
中科院分区：
文献类型：
--
作者：
J. Alvariño;C. Hepp;M. Kreiensen;B. Staudenmayer;F. Vecchiocattivi;V. Kempter
通过收集慢质量分析靶离子X+，X+2和X-，X-2，测量了亚稳态速率气体原子He（2 3S），Ne（2 p53 s）和Ar（3 p54 s）与分子靶O2和Cl 2在30 ~ 1000 eV能量范围内碰撞的积分电离截面。产生X−和X−2离子的离子对形成的横截面被发现受到连续谱和能量传递通道的强烈影响。另一方面，导致X+和X+2离子形成的潘宁电离截面的能量依赖性，被Rg+-X−2类型的低位离子态的存在强烈改变，其中Rg代表稀有气体原子。二次电子发射效率的能量依赖于亚稳态稀有气体原子He*（2 - 3S），Ne*（2 p53 s），Ar*（3 p54 s），和Kr*（4p 55 s）的动能在80和1000 eV之间。
Integral ionization cross sections have been measured for collisions of the metastable rate gas atoms He(2 3S), Ne(2p53s), and Ar(3p54s) with the molecular targets O2 and Cl2 in the energy range 30 to 1000 eV by collecting the slow mass‐analyzed target ions X+,X+2 and X−,X−2, where X stands for O and Cl. The cross sections for ion pair formation yielding X− and X−2 ions are found to be strongly influenced by the presence of continuum and energy transfer channels. The energy dependence of the cross sections for Penning ionization leading to the formation of X+ and X+2 ions is, on the other hand, strongly altered by the presence of low‐lying ionic states of the type Rg+–X−2, where Rg stands for a rare gas atom. The energy dependence of the efficiency for secondary electron emission by the metastable rare gas atom He*(2 3S), Ne*(2p53s), Ar*(3p54s), and Kr*(4p55s) is presented for kinetic energies between 80 and 1000 eV.