Window resonances below the strontium 6s threshold

M. Aymar, J. M. Lecomte, C. C. Chu, H. S. Fung, H. H. Wu, T. S. Yih

研究成果: 雜誌貢獻期刊論文同行評審

7 引文 斯高帕斯(Scopus)


Absolute photoabsorption cross sections of strontium have been measured in the energy range extending from the 5p3/2 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.

頁(從 - 到)5135-5148
期刊Journal of Physics B: Atomic, Molecular and Optical Physics
出版狀態已出版 - 14 12月 1998


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