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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 62,
  • Issue 3,
  • pp. 285-289
  • (2008)

Multipass Capillary Cell for Enhanced Raman Measurements of Gases

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Abstract

A simple Raman multipass capillary cell (MCC) is described that gives 12- to 30-fold signal enhancements for non-absorbing gases. The cell is made by coating the inside of 2-mm inner diameter silica capillary tubes with silver. The device is very small and suitable for remote and <i>in situ</i> Raman measurements with optical fibers. Application of the MCC is similar to previously described liquid core waveguides but, unlike the latter devices, the MCC is generally more applicable to a wide range of non-absorbing gases.

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