Tunable diode lasers and their application in cold molecular beam spectroscopy
- Pacific Northwest National Lab., Richland, WA (United States). Chemical Structure and Dynamics
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 3,000 to 500 cm{sup {minus}1}. Molecular beams combined with tunable diode lasers represent 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 10 K can be routinely obtained. With the appropriate pulsed slit nozzle (12 cm x 50 microns), 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.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 500936
- Report Number(s):
- CONF-960848-; ISBN 0-8194-2222-3; TRN: IM9732%%164
- Resource Relation:
- Conference: Denver `96: 1. conference on space processing of materials, at SPIE International Society for Optical Engineering (SPIE) annual international symposium on optical science, engineering, and instrumentation, Denver, CO (United States), 4-9 Aug 1996; Other Information: PBD: 1996; Related Information: Is Part Of Application of tunable diode and other infrared sources for atmospheric studies and industrial process monitoring; Fried, A. [ed.] [National Center for Atmospheric Research, Boulder, CO (United States). Atmospheric Chemistry Div.]; PB: 293 p.; Proceedings/SPIE, Volume 2834
- Country of Publication:
- United States
- Language:
- English
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