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Optics and Spectroscopy

Excitation transfer between singlet and triplet states of strontium colliding with argon atoms

Evgenii N. Borisov, N. P. Penkin, T. P. Reďko

Published Sep 1, 1987• 3 citations
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A crossed-beam time-of-flight study of metastable helium in collisions with helium, neon and argon

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Absolute velocity-resolved total integral cross sections have been measured for collisions of helium singlet (2 1 S 0 ) and triplet (2 3 S 1 2) metastable (He*) atoms with ground-state helium, neon, and argon atoms in the thermal velocity range of 1.0-3.5*10 5 cm s -1 . Additional measurements on the He*-Ne system with a large input aperture at the detector to suppress the sensitivity of the apparatus to elastic scattering failed to show the previously predicted (Arathoon) sharply rising velocity structure in the inelastic excitation transfer cross sections.

Journal of Physics B Atomic and Molecular Physics•Nov 14, 1982•3 citations
At three-photon barium and strontium atom ionization the intermediate two-photon resonances with the triplet states were discovered. The ion yield maxima corresponding to two-photon singlet-singlet and singlet-triplet resonances have approximately the same amplitude. Large probability of two-photon excitation of the triplet states sharply differed from the case for one-photon excitation. The possible reasons leading to large probabilities of two-photon excitation of the triplet states are discussed.
Absolute velocity-resolved total integral cross sections have been measured for collisions of helium singlet (2 1 S 0 ) and triplet (2 3 S 1 2) metastable (He*) atoms with ground-state helium, neon, and argon atoms in the thermal velocity range of 1.0-3.5*10 5 cm s -1 . Additional measurements on the He*-Ne system with a large input aperture at the detector to suppress the sensitivity of the apparatus to elastic scattering failed to show the previously predicted (Arathoon) sharply rising velocity structure in the inelastic excitation transfer cross sections.