21 October 1996 Multireflection flow cooling cell for IR spectroscopy of supercooled gases
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Abstract
For the simplification of molecular spectra and of the increase of spectral line intensity the enclosive-flow cooling technique was developed. The vertical cell arrangement needs only one warm window and proved to be robust and easy to handle. Compared with supersonic jet cooling, the present method provides an absorption efficiency higher by several orders of magnitude. In this paper, an improved flow cooling cell including a multireflection optics is described. Compared to the prototype cell, the multireflection cell has only 50 percent of the mass. Optical paths up to 20 m for FTIR applications and up to 40 m for TDLAS applications can be chosen. The pressure range extends from below 0.001 mbar up to 3 bar. The temperature is adjustable from 65 to 350 K. The new cooling technique offers promising applications in trace gas analysis, in the generation and spectroscopy of molecular clusters, especially of water, and in the simulation of the conditions and processes that occur in the atmosphere of Earth and other planets.
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S. Bauerecker, S. Bauerecker, Fritz Taucher, Fritz Taucher, Klaus C. H. Weitkamp, Klaus C. H. Weitkamp, H. K. Cammenga, H. K. Cammenga, "Multireflection flow cooling cell for IR spectroscopy of supercooled gases", Proc. SPIE 2834, Application of Tunable Diode and Other Infrared Sources for Atmospheric Studies and Industrial Process Monitoring, (21 October 1996); doi: 10.1117/12.255331; https://doi.org/10.1117/12.255331
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