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A time-resolved study of rotational and vibrational excitation and relaxation in the13CH3F optically pumped far-infrared laser

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3 Author(s)
McCormick, R. ; US Military Academy, West Point, NY, USA ; De Lucia, F.C. ; Skatrud, David D.

The rotational and vibrational energy transfer processes of the13CH3F optically pumped far-infrared (OPFIR) laser have been studied in a time-resolved experiment. The experiment uses a tunable millimeter and submillimeter spectroscopic technique as a diagnostic probe. Included are observations of the fast \Delta J processes that closely connect other J states within K = 3 to the directly pumped J = 5 level, a vibrational swapping mechanism that transfers excitation from K = 3 to other K states, vibrational relaxation due to both wall collisions and molecule-molecule collisions, the nonunity probability of vibrational deactivation in a wall collision, and pump saturation and hole burning effects due to the CO2pump laser. All of these observations are accounted for in the context of a numerical simulation. This results in a complete map of all of the collision-induced rotation-vibration transitions of importance to this basic OPFIR system including quantitative cross sections for the relevant processes.

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Quantum Electronics, IEEE Journal of  (Volume:23 ,  Issue: 12 )