OSCILLATOR-STRENGTHS FOR FE-II TRANSITIONS AT 224.918 AND 226.008 NANOMETERS

被引：14

作者：

BERGESON, SD

MULLMAN, KL

LAWLER, JE

机构：

[1] Physics Department, U.W.-Madison, Madison

来源：

ASTROPHYSICAL JOURNAL | 1994年 / 435卷 / 02期

关键词：

ATOMIC DATA; ISM; ABUNDANCES; ATOMS; ULTRAVIOLET;

D O I：

10.1086/187618

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report accurate experimental absorption oscillator strengths (f-values) for transitions out of the ground level of Fe II to the z(4)D(7/2)(0) and z(4)F(9/2)(0) levels at 224.918 and 226.008 nm (air wavelengths) to be 0.00182(14) and 0.00244(19), respectively. The number in parenthesis is the uncertainty in the last digits. These two lines are important for studying Fe abundances and grain depletions in the interstellar medium. These f-values are determined by combining emission branching fractions with radiative lifetimes. Branching fractions are measured using classical spectroradiometry on an optically thin source. Radiative lifetimes are from the literature.

引用

页码：L157 / L159

页数：3

共 23 条

[1] RADIATIVE LIFETIMES FOR SOME RESONANCE TRANSITIONS OF FE I AND FE II IN REGION BETWEEN 2300 A AND 3050 A, AND APPLICATION TO IRON ABUNDANCE DETERMINATIONS IN SUN AND IN QSO PHL 938 [J].