Experimental study of caesium 6PJ + 6PJ → 7PJ\’ + 6S energy pooling collisions and modelling of the excited atom density in the presence of optical pumping and radiation trapping

Year: 1997

Authors: de Tomasi F., Miloševic S., Verkerk P., Fioretti A., Allegrini M., Jabbour Z.J., Huennekens J.

Autors Affiliation: Ist. Naz. per la Fis. della Materia, Dipartimento di Fisica, Universitą di Pisa, Piazza Torricelli 2, 56126 Pisa, Italy; Department of Physics, Lehigh University, 16 Memorial Drive East, Bethlehem, PA 18015, United States; Laboratoire Aimé Cotton, CNRS II, Campus d\’Orsay, 91405 Orsay Cedex, France; Institute of Physics, PO Box 304, HR-10000 Zagreb, Croatia; Laboratoire Kastler-Brossel, Ecole Normale Superieure, Rue Lhomond, 75231 Paris Cedex 05, France; Dipto. Fis. Materia Tecnologie F., Universitą di Messina, 98166 Sant\’Agata-Messina, Italy; Automat. Prod. Technology Division, SOUND A147, NIST, Gaithersburg, MD 20899, United States

Abstract: An experimental study of caesium energy pooling collisions, Cs(6P(J)) + Cs(6P(J)) → Cs(7P(J\’)) + Cs(6S(1/2)), at thermal energies, has been carried out in a capillary cell using diode laser excitation. Use of the capillary cell minimizes the effects of radiation trapping, but nonetheless, such effects still play a significant role in the analysis. Consequently, a rate equation model, which treats simultaneous effects of saturation, optical pumping, and radiation trapping, has been developed and is used to determine the Cs(6P(J)) atom density under these experimental conditions. The excited atom densities are combined with measure fluorescence ratios to determine rate coefficients for the caesium energy pooling process. Our values for these rate coefficients are in agreement, within combined error bars, with values we have recently obtained under very different experimental conditions.

Journal/Review: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS

Volume: 30 (21)      Pages from: 4991  to: 5008

KeyWords: OSCILLATOR-STRENGTHS; CESIUM VAPOR; ALKALI-METAL; RESONANCE; PHOTOABSORPTION; LINE
DOI: 10.1088/0953-4075/30/21/031

Citations: 16
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