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Multiple Sampling Raman Cold Cell

  • John B. Bates

Abstract

Recently a low temperature sample cell for a laser excited Raman spectrophotometer was described1 in which the laser beam was positioned in the horizontal plane of the optic axis, and the incident beam entered the side of the sample chamber (Fig. 2 of Ref. 1). This variable temperature cryostat could be used with other types of spectrophotometers provided that the sample compartment was open at the top. Such a cold cell is unsuitable for the more recent Raman spectrophotometers such as the Jarrell-Ash model 25–300 in which the sample compartment is enclosed as a part of the instrument. In the model 25–300, the distance from the optic axis to the top of the sample compartment (measured to the upper optical bench) is about 8.5 in. Thus, a cryostat of the size described in Ref. 1 could not be mounted vertically without removing the upper optical bench and cutting a hole in the top of the compartment. In addition, optimum use of the light collecting system consisting of an f/0.95 camera lens which collects and collimates the scattered light requires a distance of no more than 12 mm between the sample and the rear element of the lens. This places a severe requirement on the allowed maximum distance between the sample and outer surface of the exit window of a cryostat.

Keywords

Optical Bench Cold Finger Sample Compartment Exit Window Silicone Grease 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Reference

  1. 1.
    J. B. Bates and W. H. Smith, Appl. Spectrosc. 23, 622 (1969).CrossRefGoogle Scholar
  2. 2.
    J. B. Bates, A. S. Quist, and G. E. Boyd, J. Chem. Phys. 54, 124 (1971).CrossRefGoogle Scholar
  3. 3.
    M. H. Brooker and J. B. Bates, J. Chem. Phys., to be published.Google Scholar
  4. 4.
    J. B. Bates, J. Chem. Phys., to be published.Google Scholar
  5. 5.
    J. B. Bates, J. Chem. Phys., to be published.Google Scholar

Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • John B. Bates
    • 1
  1. 1.Oak Ridge National LaboratoryOak RidgeUSA

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