论文信息 - Ionisation processes in collisions of open shell atoms. II. Oxygen and sulphur atom collisions with inert gases

Ionisation processes in collisions of open shell atoms. II. Oxygen and sulphur atom collisions with inert gases

For pt.I see ibid., vol.23, p.279 (1990). Results of an electron spectroscopy study of ionisation processes, in low keV collisions of oxygen and sulphur atoms with inert gases are presented. It is shown that ionisation close to threshold is dominantly due to population of singly excited autoionising states of the 2D(2P)nl series. At energies that are significantly above the threshold for excitation processes an additional ionisation channel which leads to a continuous electron energy distribution becomes important. A discussion in terms of the molecular orbital model is presented and indicates that quasimolecular Auger ionisation could be an efficient positive-ion production mechanism at high energies. A comparison with O- and S- collisions is conducted.

V. Esaulov | S. Boumsellek

[1] Tuan,et al. Two-electron detachment and excitation processes in S- collisions with atoms and molecules. , 1990, Physical review. A, Atomic, molecular, and optical physics.

[2] V. Esaulov,et al. Ionisation processes in collisions of open-shell atoms. I: Fluorine atom collisions with inert gases and molecules , 1990 .

[3] T. Reddish,et al. Atomic autoionisation following neutral photodissociation of O2 , 1989 .

[4] V. Esaulov,et al. Fundamental processes in collisions of O- with atoms and molecules; mechanisms of one- and two-electron loss , 1987 .

[5] V. Esaulov. Electron detachment from atomic negative ions , 1986 .

[6] V. Esaulov,et al. O - scattering by noble gases , 1980 .

[7] M. Barat,et al. Collision spectroscopy of open-shell systems. II. N+-Ne collisions , 1979 .

[8] J. Gauyacq,et al. Collisions between rare-gas atoms at low-keV energies. II. Asymmetric collision systems: He-Ne, -Ar, -Kr, -Xe , 1975 .

[9] A. K. Edwards,et al. Electron spectra from collisions of O$sup -$ and O with helium , 1973 .

[10] V. Sidis. One centre molecular study of the single ionization of He by He+ impact at moderate energy , 1973 .

[11] R. Novick,et al. Auto-ionizing states in the alkali atoms with microsecond lifetimes. , 1967 .