Oxygen(1.SIGMA.g+) energy transfer carbon dioxide laser

The total quenching rates of O2(b 1Σ+g) by CO2, H2O, and I2 have been determined to be (4.53±0.29)×10−13 cm3 molec−1 sec−1, (6.71±0.53)×10−12 cm3 molec−1 sec−1, and (2.04±0.28)×10−11 cm3 molec−1 sec−1, respectively. A pulsed, Raman-shifted dye laser was used to excite a single rotational line of O2(1Σ, v′=0), while subsequent 1Σ→3Σ fluorescence was monitored by a photon counting technique to determine the deactivation rate as a function of the partial pressure of quenching gas. Rate constants for deactivation of O2(1Σ) by CO2 and H2O were found to be consistent with those measured elsewhere, whereas I2 was found to quench O2(1Σ) an order of magnitude more slowly than reported in the literature. The lower total quenching constant for I2 suggests that the reaction O2(1Σ)+I2→O2(3Σ) +2I might not be responsible for dissociation of I2 in the chemical oxygen-iodine laser.

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Pumping mechanism of Javan’s pure rotational OH laser

Robinson

1982

Applied Physics Letters

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Javan and coworkers have reported pure rotational laser oscillation from OH and OD in a pulsed discharge through H2-O2-SF6 mixtures. The pumping mechanism was not established, but it was thought at the time to be chemical. The intensity distribution can be understood as resulting from the electronic to rotational transfer of 13 200 cm−1 from O2(1Σ+g ) to ground vibrational state OH(2Π) leaving the O2 in its ground 3Σ−g state. Unexcited OH would be formed from either the reaction O+H2 = OH+H or H+O2 = OH+O. Nothing can be said about the efficiency of this E-R transfer compared to E-V; however, E-R appears to be a new mechanism for pumping diatomic, pure rotational inversions. The full explanation of this laser also demands the conclusion that SF6, like the rare gases, can serve as a collision partner inducing intramolecular V-R transition in OH.

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Oxygen(1.SIGMA.g+) energy transfer carbon dioxide laser

Cited by 3 publications

References 3 publications

Temperature-dependent quenching of O2(b 1Σ+g) by H2, D2, CO2, HN3, DN3, HNCO and DNCO

Temperature-dependent quenching of O2(b 1Σ+g) by H2, D2, CO2, HN3, DN3, HNCO and DNCO

Quenching of laser-excited O2(b 1Σ+g) by CO2, H2O, and I2

Pumping mechanism of Javan’s pure rotational OH laser

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