Abstract
A spectroscopic study of the band systemsG 1 Σ g →B 1 Σ u andI 1 Π g →B 1 Σ u of H2 emitted by a glow discharge in H2 gas showed that the populations of theG 1 Σ g (v, J) states decrease for the benefit of theI 1 Π u (v′, J′) states when the discharge is irradiated by a powerful CO2 Laser beam (power density 70 kW/cm2). The effect is interpreted as an absorption process in which two Laser photons intervene according to the transition scheme:G 1 Σ g →B″1 Σ u →I 1 Π g. A change of the populations of excited electronic states should lead to a change of the populations of excited atomic states as well.
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Dubreuil, B., Drawin, H.W. & Chapelle, J. Excitation transfer between excited electronic states of the H2 molecule due to interaction with a CO2 Laser beam. Z Physik B 20, 117–122 (1975). https://doi.org/10.1007/BF01313921
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DOI: https://doi.org/10.1007/BF01313921