Measurement of molecular electronic ground state oxygen O2(3sigma) in COIL device

Frank R. Duschek; Karin M. Gruenewald; Juergen Handke; Wolfgang O. Schall

doi:10.1117/12.610973

23 March 2005 Measurement of molecular electronic ground state oxygen O₂(3Σ) in COIL device

Frank R. Duschek, Karin M. Gruenewald, Juergen Handke, Wolfgang O. Schall

Proceedings Volume 5777, XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; (2005) https://doi.org/10.1117/12.610973
Event: XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2004, Prague, Czech Republic

Abstract

The improvement of the efficiency of singlet oxygen generators (SOG) in chemical oxygen iodine lasers (COIL) is still a key component for optimizing the performance of these lasers. Important parameters for the SOG operation are the utilization of chlorine and the singlet oxygen yield. In this work, the singlet oxygen yield is examined by two different methods: the absorption spectroscopy of ground state molecular oxygen O₂(³Σ) based on a commercial diode laser system in conjunction with a multi-pass Herriott cell, and the measurement of spontaneous emission of the O₂(³Σ)-O₂(¹Δ) transition in the near infrared (1.27 μm). A separate calibration cell has been build with geometry identical to the diagnostic duct of the DLR COIL for exact calibration of the absorption measurement. Results of simultaneously applied emission and absorption measurements are compared. This procedure allows the determination of the radiative lifetime of O₂(¹Δ) to a value of 3730 s.

Citation Download Citation

Frank R. Duschek, Karin M. Gruenewald, Juergen Handke, and Wolfgang O. Schall "Measurement of molecular electronic ground state oxygen O₂(3Σ) in COIL device", Proc. SPIE 5777, XV International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, (23 March 2005); https://doi.org/10.1117/12.610973

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