Low-pressure collisional narrowing in CO2 |
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Authors: | Rajarshi Roy D.S. Elliot D. Meschede F.M. Pipkin S.J. Smith |
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Affiliation: | Joint Institute for Laboratory Astrophysics, University of Colorado and National Bureau of Standards, Boulder, Colorado 80309, USA |
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Abstract: | We report the observation of collisional narrowing of the Q branch of the Raman spectrum for the (000) → (100) transition in CO2 at very low pressures. The minimum linewidth is reached at ≈250 Torr. An estimate for the difference in rotational constants of the (100) state and the ground state is obtained. The narrowing of the linewidth and the changes in line-shape are interpreted in terms of velocity changing collisions and rotationally inelastic collisions between the CO2 molecules. |
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