Tunable diode lasers and their application in cold molecular beam spectroscopy

Steven W. Sharpe; Songlin Xu; Robin McDowell; Thomas A. Blake

doi:10.1117/12.255314

21 October 1996 Tunable diode lasers and their application in cold molecular beam spectroscopy

Steven W. Sharpe, Songlin Xu, Robin McDowell, Thomas A. Blake

Proceedings Volume 2834, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Process Monitoring; (1996) https://doi.org/10.1117/12.255314
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Supersonic molecular expansions provide a unique environment in which to acquire the infrared spectra of many molecular systems. Tunable diode lasers offer high spectral brightness, low noise, rapid tuning, and contiguous spectral coverage in the infrared, from 3000 to 500 cm^-1. Molecular beams combined with tunable diode lasers represents a powerful tool for reducing or removing spectral congestion arising from both pressure broadening and rotational excitation. Depending on expansion conditions, rotational temperatures on the order of 10K can be routinely obtained. With the appropriate pulsed slit nozzle, Doppler broadening is reduced six-fold or more over that of room temperature, static cells. In addition, by employing modified White cell optics, effective optical path lengths of 3 meters can be realized. A description of Pacific Northwest National Laboratory's beam-diode laser spectrometer will be given along with recent results for studies involving the fully rotationally resolved spectra of several molecules of atmospheric interest including chlorine nitrate and carbon tetrachloride.

Citation Download Citation

Steven W. Sharpe, Songlin Xu, Robin McDowell, and Thomas A. Blake "Tunable diode lasers and their application in cold molecular beam spectroscopy", Proc. SPIE 2834, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Process Monitoring, (21 October 1996); https://doi.org/10.1117/12.255314

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