Absolute photoabsorption cross sections of Sr I from the 5s ionization threshold to the 5p threshold

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/39057

Title:	Absolute photoabsorption cross sections of Sr I from the 5s ionization threshold to the 5p threshold
Authors:	Chu,CC;Fung,HS;Wu,HH;Yih,TS
Contributors:	物理研究所
Keywords:	F-VALUES;STRONTIUM;EXCITATION;SPECTRUM;ATOMS;SERIES;STATES
Date:	1998
Issue Date:	2010-07-08 14:03:34 (UTC+8)
Publisher:	中央大學
Abstract:	We have measured the absolute photoabsorption cross sections of Sr I from its 5s ionization threshold up to the 5p(1/2,3/2) thresholds. The spectrum includes the Sr I 4dnp, 4dnf, 5pns and 5pnd doubly excited series which converge to the 4d(3/2.5/2) or 5p(1/2.3/2) series limits. Synchrotron radiation, from the 1 m Seya-Namioka beam line of the Synchrotron Radiation Research Center at Hsin-Chu: Taiwan, was used as the background continuum. The absolute column density was determined by measuring simultaneously the temperature distribution profiles and the total pressure in a heatpipe. Absolute cross sections were obtained using the Beer-Lambert law. The measured absolute cross section for the 5s ionization threshold was 7.2 Mb +/- 0.9 Mb. At the most significant autoionizing resonance, 4d6p P-1 around 196 nm, the absolute cross section was measured as 51.0 Mb +/- 6.6 Mb. The absolute cross sections presented here are larger than those based on saturated vapour-pressure data, and less than those based on the f-value measurements. All the absolute cross sections in this work are compared with both recent experiments and theoretical calculations.
Relation:	JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Appears in Collections:	[Graduate Institute of Physics] journal & Dissertation

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