Electron impact ionization of the SF5 and SF3 free radicals

被引：43

作者：

Tarnovsky, V ^{[1
]}

Deutsch, H

Martus, KE

Becker, K

机构：

[1] Stevens Inst Technol, Dept Phys & Engn Phys, Hoboken, NJ 07030 USA

[2] Ernst Moritz Arndt Univ Greifswald, Inst Phys, D-17847 Greifswald, Germany

[3] William Paterson Univ New Jersey, Dept Chem & Phys, Wayne, NJ 07470 USA

来源：

JOURNAL OF CHEMICAL PHYSICS | 1998年 / 109卷 / 16期

关键词：

D O I：

10.1063/1.477311

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：

We measured absolute cross sections for the electron-impact ionization and dissociative ionization of the SF5 and SF3 free radicals from threshold to 200 eV using the fast-neutral-beam technique. The total single ionization cross sections at 70 eV were found to be 5.1 x 10(-16) cm(2) (SF5) and 3.2 x 10(-16) cm(2) (SF3). The cross sections reach their maximum at about 100 eV for both radicals, with values of 5.4 x 10(-16) cm(2) (SF5) and 3.5 x 10(-16) cm(2) (SF3). Dissociative ionization is important only for SF5, where the SF5+ parent ionization cross section and the SF4+ fragment ionization cross sections have roughly the same value. By contrast, the ionization of SF3 is dominated by the formation of SF3+ parent ions. A comparison of the measured total single ionization cross sections with calculated cross sections, using a modified additivity rule, shows excellent agreement for both radicals in terms of the absolute cross section values and the cross section shapes. Total single ionization cross sections were also calculated for SF4, SF2, and SF. (C) 1998 American Institute of Physics. [S0021-9606(98)00940-3].

引用

页码：6596 / 6600

页数：5

共 24 条

[11] RELATIVE CROSS-SECTIONS FOR ELECTRON-IMPACT DISSOCIATION OF SF6 INTO SFX (X=1-3) NEUTRAL RADICALS [J].

IIO, M ;

GOTO, M ;

TOYODA, H ;

SUGAI, H .

CONTRIBUTIONS TO PLASMA PHYSICS, 1995, 35 (4-5) :405-413

[12] DIELECTRIC-PROPERTIES FOR SF6 AND SF6 MIXTURES PREDICTED FROM BASIC DATA [J].

KLINE, LE ;

DAVIES, DK ;

CHEN, CL ;

CHANTRY, PJ .

JOURNAL OF APPLIED PHYSICS, 1979, 50 (11) :6789-6796

[13]

LIAS SG, 1988, J PHYS CHEM REF DATA, V17, P1

[14] ELECTRON-IMPACT IONIZATION CROSS-SECTIONS OF MOLECULES .1. EXPERIMENTAL-DETERMINATION OF PARTIAL IONIZATION CROSS-SECTIONS OF SF6 - A CASE-STUDY [J].

MARGREITER, D ;

WALDER, G ;

DEUTSCH, H ;

POLL, HU ;

WINKLER, C ;

STEPHAN, K ;

MARK, TD .

INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES, 1990, 100 :143-156

[15]

*MASS SPECTR DAT C, 1974, 8 PEAK IND MASS SPEC

[16] COLLISIONAL ELECTRON DETACHMENT AND DECOMPOSITION RATES OF SF6-, SF5-, AND F- IN SF6 - IMPLICATIONS FOR ION-TRANSPORT AND ELECTRICAL DISCHARGES [J].

OLTHOFF, JK ;

VANBRUNT, RJ ;

WANG, YC ;

CHAMPION, RL ;

DOVERSPIKE, LD .

JOURNAL OF CHEMICAL PHYSICS, 1989, 91 (04) :2261-2268

[17] MEASUREMENTS OF DISSOCIATIVE IONIZATION CROSS-SECTION OF SF6 BY USING DOUBLE COLLECTOR CYCLOIDAL MASS-SPECTROMETER [J].

STANSKI, T ;

ADAMCZYK, B .

INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES, 1983, 46 (JAN) :31-34

[18] Absolute cross section for the formation of C+60 ions produced by electron impact on C60 [J].

Tarnovsky, V ;

Kurunczi, P ;

Matt, S ;

Mark, TD ;

Deutsch, H ;

Becker, K .

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1998, 31 (13) :3043-3048

[19] ABSOLUTE CROSS-SECTIONS FOR THE DISSOCIATIVE ELECTRON-IMPACT IONIZATION OF THE CF(X) (X = 1-3) FREE-RADICALS [J].

TARNOVSKY, V ;

KURUNCZI, P ;

ROGOZHNIKOV, D ;

BECKER, K .

INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES, 1993, 128 (03) :181-194

[20] ABSOLUTE PARTIAL CROSS-SECTIONS FOR THE PARENT IONIZATION OF THE CFX (X=1-3) FREE-RADICALS BY ELECTRON-IMPACT [J].

TARNOVSKY, V ;

BECKER, K .

JOURNAL OF CHEMICAL PHYSICS, 1993, 98 (10) :7868-7874

← 1 2 3 →