Detailed experimental and theoretical study of collision-induced dissociation of Na2+ ions on He and H2 targets at keV energies

被引:45
作者
Fayeton, JA [1 ]
Barat, M
Brenot, JC
Dunet, H
Picard, YJ
Saalmann, U
Schmidt, R
机构
[1] Univ Paris 11, Collis Atom & Mol Lab, URA D 0281, F-91405 Orsay, France
[2] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany
[3] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden, Germany
关键词
D O I
10.1103/PhysRevA.57.1058
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A combined experimental and theoretical investigation of collision-induced dissociation (CID) of the quasi-one-electron system Na-2(+) He at 80 eV center-of-mass energy is presented. This study, complemented by additional measurements with an H-2 target, provides a detailed analysis of the competition between the two basic CID mechanisms: via excitation of electronic states of the Na-2(+) molecular ion and via momentum transfer to one of the Na+ core. The experimental method is based on a combined coincidence and time-of-flight technique, resulting in a complete measurement of the velocity vectors of the two fragments and giving a full determination of the collision parameters. The theoretical analysis is based on the so-called nonadiabatic quantum molecular dynamics, developed recently. This theory treats self-consistently and simultaneously classical atomic motion and quantum electronic transitions in dynamical processes of atomic many-body systems using time-dependent density functional theory. It allows one to simulate the experiment in microscopic detail and. thus, provides a deep insight into the excitation and dissociation mechanism. The combined theoretical and experimental analysis can later be extended to more complex systems like larger molecules or clusters. [S1050-2947(98)04602-2].
引用
收藏
页码:1058 / 1068
页数:11
相关论文
共 24 条
[1]  
[Anonymous], COLLISION SPECTROSCO
[2]   Collision induced fragmentation of small sodium cluster ions [J].
Barat, M ;
Brenot, JC ;
Dunet, H ;
Fayeton, JA .
ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS, 1997, 40 (1-4) :323-326
[3]  
BARAT M, IN PRESS PHYSICS ELE
[4]  
BARAT M, UNPUB
[5]   CLASSICAL THEORY OF ION-MOLECULE REARRANGEMENT COLLISIONS AT HIGH IMPACT ENERGIES [J].
BATES, DR ;
COOK, CJ ;
SMITH, FJ .
PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON, 1964, 83 (5311) :49-+
[6]   Analysis of collision induced dissociation of Na-2(+) molecular ions [J].
Brenot, JC ;
Dunet, H ;
Fayeton, JA ;
Barat, M ;
Winter, M .
PHYSICAL REVIEW LETTERS, 1996, 77 (07) :1246-1249
[7]   COMMENTS ON THE VARIOUS REPRESENTATIONS OF DIFFERENTIAL CROSS-SECTIONS [J].
BRENOT, JC ;
DURUPFERGUSON, M ;
FAYETON, JA ;
GOUDJIL, K ;
BARAT, M .
CHEMICAL PHYSICS, 1994, 179 (03) :549-556
[8]   HIGH INTENSITY SUPERSONIC MOLECULAR BEAM APPARATUS [J].
CAMPARGUE, R .
REVIEW OF SCIENTIFIC INSTRUMENTS, 1964, 35 (01) :111-&
[9]   TIME AND POSITION-SENSITIVE DETECTOR FOR DISSOCIATIVE PROCESSES IN FAST BEAMS [J].
DEBRUIJN, DP ;
LOS, J .
REVIEW OF SCIENTIFIC INSTRUMENTS, 1982, 53 (07) :1020-1026
[10]   A DETAILED EXPERIMENTAL-STUDY OF THE DISSOCIATIVE CHARGE-EXCHANGE OF H-2+ WITH AR, MG, NA AND CS TARGETS AT KEV ENERGIES [J].
DEBRUIJN, DP ;
NEUTEBOOM, J ;
SIDIS, V ;
LOS, J .
CHEMICAL PHYSICS, 1984, 85 (02) :215-231