Physical Sciences Inc. Publications Abstract: Observations of Gain on the I(2P1/2 → 2P3/2) Transition by Energy Transfer from O2(a1∆g) Generated by a Microwave Discharge in a Subsonic Flow Reactor

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Abstract: Observations of Gain on the I(2P1/2 → 2P3/2) Transition by Energy Transfer from O2(a1∆g) Generated by a Microwave Discharge in a Subsonic Flow Reactor

W.T. Rawlins, S. Lee, W.J. Kessler, S.J. Davis, "Observations of Gain on the I(2P1/2 → 2P3/2) Transition by Energy Transfer from O2(a1∆g) Generated by a Microwave Discharge in a Subsonic Flow Reactor ," Applied Physics Letters 86 (5) , 051105-1-3 (31 January 2005).

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Abstract

The excitation of the I(²P_1/2) in the reactions of discharge-generated O₂(a¹∆_g) and O(³P) with 1₂ has been investigated in a microwave discharge-flow reactor at 1.5 torr and ~ 350 K using a suite of optical absorption and emission diagnostics to detect O₂(a¹∆_g, O, I(²P_1/2), and I(²P_3/2) with high sensitivity. For O₂(a¹∆_g yields of 0.20-0.25 generated by the microwave discharge, positive gain on the I(²P_1/2 → ²P_3/2) transition at 1.315 µm was observed when O concentrations were reduced by reaction with added NO₂. The results imply quenching mechanisms for I(²P_1/2), which are much faster than direct collisional deactivation by O.

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