Electron-impact broadening of radio recombination lines of atomic hydrogen for different Δn

被引：24

作者：

Watson, JKG ^{[1
]}

机构：

[1] Natl Res Council Canada, Steacie Inst Mol Sci, Ottawa, ON K1A 0R6, Canada

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2006年 / 39卷 / 08期

关键词：

D O I：

10.1088/0953-4075/39/8/007

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

In 1967 Griem gave a general formula for the electron-impact broadening of radio recombination lines, and an approximate expression for the width of the Delta n = 1 lines. Here his general formula is calculated numerically for higher values of Delta n, and an approximate expression is fitted to the results for Delta n up to 70. It is shown that, for the lines with different n and Delta n near a given frequency v, the calculated widths increase monotonically up to n > 300. This result does not agree with the maximum found near n approximate to 200 by Bell et al (2000 Publ. Asti-on. Soc. Pac. 112 1236) for the astronomical sources W51 and Orion A at 6 GHz. Thus this mystery is not resolved by the present calculations.

引用

页码：1889 / 1897

页数：9

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