Window resonances below the strontium 6s threshold

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题名:	Window resonances below the strontium 6s threshold
作者:	Aymar,M;Lecomte,JM;Chu,CC;Fung,HS;Wu,HH;Yih,TS
贡献者:	物理研究所
关键词:	QUANTUM-DEFECT THEORY;R-MATRIX CALCULATION;BARIUM;STATES;ATOMS
日期:	1998
上传时间:	2010-07-08 14:05:20 (UTC+8)
出版者:	中央大學
摘要:	Absolute photoabsorption cross sections of strontium have been measured in the energy range extending from the 5p(3/2) threshold up to above the 6s threshold. The synchrotron radiation source of the Synchrotron Radiation Research Center at Hsin-Chu was used as the background continuum. Strontium vapour was confined in a heatpipe oven. The absolute column density was determined by simultaneously measuring the temperature distribution profiles and the total pressure in the heatpipe. Absolute cross sections were determined using the Beer-Lambert law. The observed spectrum was analysed using a combination of a recent extension of the jj-coupled eigenchannel R-matrix adapted to handle highly correlated levels and the phase-shifted multichannel quantum defect theory. The main features of the observed spectrum, dominated by the presence of many window-type resonances, are well reproduced and the structures are identified. The observed absorption windows result from the fact that only continua are directly excited from the ground state.
關聯:	JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
显示于类别:	[物理研究所] 期刊論文

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