Electron-impact ionization of Be-like CIII, NIV, and OV

被引：32

作者：

Fogle, M. ^{[1
]}

Bahati, E. M. ^{[1
]}

Bannister, M. E. ^{[1
]}

Vane, C. R. ^{[1
]}

Loch, S. D. ^{[2
]}

Pindzola, M. S. ^{[2
]}

Ballance, C. P. ^{[3
]}

Thomas, R. D. ^{[4
]}

Zhaunerchyk, V. ^{[4
]}

Bryans, P. ^{[5
]}

Mitthumsiri, W. ^{[5
]}

Savin, D. W. ^{[5
]}

机构：

[1] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA

[2] Auburn Univ, Dept Phys, Auburn, AL 36849 USA

[3] Rollins Coll, Dept Phys, Winter Pk, FL 32789 USA

[4] Univ Stockholm, Dept Phys, S-10691 Stockholm, Sweden

[5] Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2008年 / 175卷 / 02期

关键词：

atomic data; atomic processes; methods : laboratory;

D O I：

10.1086/525256

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present recent measurements of absolute electron-impact ionization cross sections for Be-like C III, N IV, and O V forming Li- like C IV, N V, and O VI. The measurements were taken using the crossed-beams apparatus at Oak Ridge National Laboratory. A gas cell beam attenuation method was used to independently measure the metastable fractions present in the ion beams. The measured ionization cross sections were compared with calculations using the R-matrix with pseudostates and distorted-wave theoretical methods. Best agreement is found with the R-matrix with pseudostates cross sections results that account for the metastable fractions inferred from the gas attenuation measurements. We present a set of recommended rate coefficients for electron-impact single ionization from the ground state and metastable term of each ion.

引用

页码：543 / 556

页数：14

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