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Zeitschrift für Physik D Atoms Molecules and Clusters

Collision induced mixing of two light beams in Na2 molecules

Krystyna Kolwas, M. Kolwas

Published Mar 1, 1989• 0 citations
Publisher
DOI
10.1007/bf01401340

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By spectroscopically analyzing the white light and laser-induced fluorescence excited in a nozzle beam of Na2 molecules, we have measured the population distribution of the (v,J) levels of the ground state. The Na2 molecules are produced in nozzle beams with various stagnation pressures (50–240 torr) of alkali metal and with nozzles of different throat diameters (0.12–0.50 mm). We find at a stagnation pressure of 50 torr and a nozzle diameter of 0.5 mm a Boltzmann distribution characterized by a vibrational temperature of 153 ± 5°K and a rotational temperature of 55± 10°K. Beams under different stagnation conditions have essentially the same internal state distribution. Studies of K2 dimers produced in a nozzle beam with various stagnation pressures (20–300 torr) and a 0.25 mm nozzle throat diameter also show cooling in both vibrational and rotational modes. A search is made for atomic fluorescence arising from the photodissociation of dimers in high vibrational levels of the ground state. No evidence is found for the presence of vibrationally-excited dimers in the nozzle beam.
The processes of excitation transfer from the 82S1/2 state to the 62D state of rubidium in Rb(82S1/2) – Rb(52S1/2) and Rb(82S1/2) – H2 collisions have been studied experimentally. During irradiating the Rb vapor, mixed with H2, by two light beams for selective stepwise excitation, the Rb 82S1/2 → 52P3/2 direct fluorescence and the Rb 62D3/2 → 52P1/2 sensitized fluorescence have been measured as a function of H2 gas pressure. The measurements yielded the cross-sections σ(82S1/2 → 62D) and σ*(82S1/2 → 62D) of Rb 82S1/2 → 62D excitation transfer induced by collisions with 52S1/2 Rb atom and H2 molecules respectively. The results are discussed in detail.