Energy pooling to the level arising from collisions between pairs of metastable atoms |
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Authors: | C Vadla K Niemax V Horvatic |
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Institution: | (1) Institute of Physics, Bijenicka 46, 10000 Zagreb, Croatia, HR;(2) Institut für Spektrochemie und Angewandte Spektroskopie (ISAS), Bunsen-Kirchhoff-Strasse 11, 44129 Dortmund, Germany, DE |
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Abstract: | The energy-pooling rate coefficient for the
process has been measured. The barium atoms were excited by a cw diode laser tuned to the frequency of the 791.3 nm intercombination
line and the metastable atoms in the 6s5d state were produced due to radiative and collisional depopulation of the laser-excited 6s6p state. The measurements were performed at number densities of about and at 30 mbar argon as the buffer gas. Most of the barium ground state atoms in the excitation zone were transferred to
the trip let metastable state at the laser pump power applied. The energy pooling rate coefficient was determined by comparing
the fluorescence intensity of the barium 553.6 nm resonance line and the fluorescence intensity of the intercombination line
791.3 nm. In addition, the populations of the metastable atoms were probed with low intensity laser radiation from a single
mode ring dye laser. The rate coefficient was found to be at .
Received: 11 April 1997 / Revised: 24 September 1997 / Accepted: 10 December 1997 |
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Keywords: | PACS 34 50 -s Scattering of atoms molecules and ions -32 00 Atomic properties and interactions with photons |
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