RELATIVE CROSS-SECTIONS AND KINETIC-ENERGY RELEASE VALUES IN DISSOCIATIVE NEGATIVE-ION FORMATION BY SUCCESSIVE SINGLE-ELECTRON TRANSFER FROM ALKALI-METAL TARGETS

被引:10
作者
HAYAKAWA, S
机构
[1] College of Integrated Arts and Sciences, University of Osaka Prefecture, Sakai, 593
来源
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES | 1992年 / 116卷 / 03期
关键词
CROSS-SECTIONS; KINETIC ENERGY RELEASE; NEGATIVE ION FORMATION; ALKALI METALS;
D O I
10.1016/0168-1176(92)80039-4
中图分类号
O64 [物理化学(理论化学)、化学物理学]; O56 [分子物理学、原子物理学];
学科分类号
070203 ; 070304 ; 081704 ; 1406 ;
摘要
Positive ions formed from C2H2 were collided with Cs, K and Na targets in the kiloelectronvolt energy range. The dissociative negative ion formations of C2- and C2H- ions from C2H2+ ions and C2- ions from C2H+ ions with an alkali metal target were determined to be double-collision processes using the target density dependence. By considering the reaction energies and comparing with reionization to positive ions, main processes of the dissociative negative ion formations were assigned to successive single-electron transfers with the dissociation of excited neutrals. The kinetic energy release values at FWHM of C2H-ions from C2H2+ ions were 0.55 eV for Cs, 0.28 eV for K and 0.17 eV for Na. The relative cross-sections of C2- ions from C2H2+ ions to those of C2H- ions from C2H2+ ions were 5.35 for Cs, 1.89 for K and 0.32 for Na. These dependences on target species are discussed in relation to the energy difference for the exothermic neutralization.
引用
收藏
页码:167 / 181
页数:15
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