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Laser optogalvanic spectroscopy of N2 from the AΣu metastable state in a corona excited supersonic expansion |
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| Authors: | I Hadj Bachir T R Huet J L Destombes and M Vervloet |
| Institution: | a Laboratoire de Spectroscopie Hertzienne, URA CNRS 249, Centre d'Etudes et de Recherches Lasers et Applications, Université des Sciences et Technologies de Lille, F-59655, Villeneuve d'Ascq cedex, France b Laboratoire de Photophysique Moléculaire du CNRS, Université de Paris-Sud, Bâtiment 213, F-91405, Orsay cedex, France |
| Abstract: | A hollow cathode combined with a corona excited supersonic expansion has proven to be an efficient method of producing a stable discharge in a N2/Ar gas mixture. A high-resolution and rotationally cold absorption spectrum of the well-known (2,0) and (8,7) bands of the B3Πg ← A3Σu+ first positive system of N2 was recorded. It illustrates the sensitivity of the laser optogalvanic detection technique coupled to such an apparatus. A significant reduction of the linewidth and an enhancement of the signal-to-noise ratio were obtained. A high variational excitation process has been observed and is discussed. |
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