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Resonant optical absorption spectroscopy of Ce.

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Název: Resonant optical absorption spectroscopy of Ce.
Autoři: Britun, Nikolay, Ershov, Sergey, Mel, Abdel-Aziz El, Konstantinidis, Stephanos, Ricard, André, Snyders, Rony
Zdroj: Journal of Physics D: Applied Physics; 2013, Vol. 46 Issue 17, p1-7, 7p
Témata: MAGNETIC resonance, MAGNETRON sputtering, ARGON, CERIUM, ABSORPTION
Abstrakt: Resonant optical absorption of ground state Ce atoms is demonstrated. Ce I resonant emission line at 461.05 nm (Aij = 28 x 108 s-1) corresponding to the transition 4f5d6s²-4f² (¹G)5d(²I)6s is utilized. In a magnetron sputtering discharge used as an atomic source, the absolute densities of atomic ground state Ce sputtered in pure Ar and in Ar-O2 (oxidized magnetron cathode) gas mixtures are found to be nearly 2 x 108 cm-3 (pure Ar) and 1 x 107 cm-3 (Ar + O2). The phenomena inherent in reactive sputtering, such as the non-oxidized-oxidized regime transition and the hysteresis of the transition point, are detected. The obtained data are compared with the existing results of a similar absorption analysis performed in the Ti dc magnetron discharges. The discrepancies in the obtained Ce and Ti absolute ground state densities are analysed. [ABSTRACT FROM AUTHOR]
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Abstrakt:Resonant optical absorption of ground state Ce atoms is demonstrated. Ce I resonant emission line at 461.05 nm (A<subscript>ij</subscript> = 28 x 10<sup>8</sup> s<sup>-1</sup>) corresponding to the transition 4f5d6s²-4f² (¹G)5d(²I)6s is utilized. In a magnetron sputtering discharge used as an atomic source, the absolute densities of atomic ground state Ce sputtered in pure Ar and in Ar-O<subscript>2</subscript> (oxidized magnetron cathode) gas mixtures are found to be nearly 2 x 10<sup>8</sup> cm<sup>-3</sup> (pure Ar) and 1 x 10<sup>7</sup> cm<sup>-3</sup> (Ar + O<subscript>2</subscript>). The phenomena inherent in reactive sputtering, such as the non-oxidized-oxidized regime transition and the hysteresis of the transition point, are detected. The obtained data are compared with the existing results of a similar absorption analysis performed in the Ti dc magnetron discharges. The discrepancies in the obtained Ce and Ti absolute ground state densities are analysed. [ABSTRACT FROM AUTHOR]
ISSN:00223727
DOI:10.1088/0022-3727/46/17/175202