Dissociative recombination and excitation of N2+:: Cross sections and product branching ratios

被引:166
作者
Peterson, JR [1 ]
Le Padellec, A
Danared, H
Dunn, GH
Larsson, M
Larson, A
Peverall, R
Strömholm, C
Rosén, S
af Ugglas, M
van der Zande, WJ
机构
[1] SRI Int, Mol Phys Lab, Menlo Pk, CA 94025 USA
[2] Royal Inst Technol, Dept Phys, S-10044 Stockholm, Sweden
[3] Univ Stockholm, Manne Siegbahn Lab, S-10405 Stockholm, Sweden
[4] Univ Colorado, Joint Inst Lab Astrophys, Boulder, CO 80309 USA
[5] Natl Inst Stand & Technol, Boulder, CO 80309 USA
[6] Univ Stockholm, Dept Phys, S-11385 Stockholm, Sweden
[7] FOM, Inst Atom & Mol Phys, NL-1098 SJ Amsterdam, Netherlands
关键词
D O I
10.1063/1.475577
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The absolute dissociative recombination and absolute dissociative excitation rate coefficients and cross sections have been determined for N-2(+) and electrons for collision energies between 10 meV and 30 eV. The ion storage ring CRYRING has been used in combination with an imaging technique with a position-and-time-sensitive detector. Information is retrieved on the ion beam vibrational state populations and on the product branching in the dissociative recombination process at 0 eV collisions. A hollow cathode ion source has been used to lower the vibrational excitation in the ion beam; a more traditional hot-cathode ion source was used as well. The most important findings are the following. The rate coefficient for an N-2(+) ion beam (46%, upsilon = 0, 27% upsilon = 1) versus electron temperature (K) is alpha(T-e) = 1.75(+/-0.09) x 10(-7)(T-e/300)(-0.30) cm(3) s(-1). The dissociative recombination rate is found to be weakly dependent on the N-2(+) vibrational level. At 0 eV collision energy, the upsilon = 0 product branching is found to be 0.37(8):0.11(6):0.52(4) for N(S-4) + N(D-2):N(P-2) + N(S-4) + N(D-2) + N(D-2) fragments. The dissociative recombination cross section does not have a high-energy peak as was found in a number of lighter molecular systems. The dissociative excitation signal starts only slightly above the energy threshold for dissociation, and peaks near 25 eV. From the dissociative excitation data and literature data, information is retrieved on the dissociative ionization of N-2(+). The comparison of these results with earlier DR measurements is extensively discussed. (C) 1998 American Institute of Physics.
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页码:1978 / 1988
页数:11
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