Thermal-energy charge transfer, quenching, and association reactions of doubly charged ions in the rare gases

1979 ◽  
Vol 20 (1) ◽  
pp. 87-97 ◽  
Author(s):  
Rainer Johnsen ◽  
Manfred A. Biondi
1980 ◽  
Vol 76 (1) ◽  
pp. 109-112 ◽  
Author(s):  
D.A Church ◽  
H.M. Holzscheiter

1962 ◽  
Vol 79 (6) ◽  
pp. 1118-1123 ◽  
Author(s):  
M Islam ◽  
J B Hasted ◽  
H B Gilbody ◽  
J V Ireland

Doubly charged ions of each of the rare gases neon, argon, krypton and xenon, formed by electron impact and accelerated through 6 kV in a double-focusing mass spectrometer, are ionized to the corresponding triply charged ions via processes of at least two general kinds. The first proceeds under collision-free conditions, and can be attributed to delayed (microsecond) autoionization. An alternative explanation involving transitions from high Rydberg states, induced by the 350 K black-body radiation within the analyser vacuum housing, cannot be entirely ruled out. Other ionization processes require a collision with a molecule of collision gas, and result in a measurable loss of translational energy. In this paper the knowledge of analogous processes of the corresponding singly charged ions is reviewed, the general features of the translational energy spectra are established, and effort is devoted to the characterization of the collision-free process. The collision-induced processes have been interpreted in terms of known metastable states of the doubly charged ions.


Measurements of the partial charge transfer cross-sections for doubly charged ions X 2+ + Y → Y + + X + are described for C 2+ , N 2+ , A 2+ in He, Ne, A, and the results are discussed in terms of divergence from near-àdiabatic conditions caused by the crossing of potential energy curves. The single endothermic case C 2+ in He behaves adiabatically; all the others, which are exothermic, show large cross-sections at low energies. In the case A 2+ in A there is a contribution from double charge transfer, which cannot be distinguished experimentally from partial charge transfer.


1979 ◽  
Vol 40 (C7) ◽  
pp. C7-21-C7-22
Author(s):  
K. Peska ◽  
E. Alge ◽  
H. Villinger ◽  
H. Störi ◽  
W. Lindinger

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