Document Detail

High-temperature multipass cell for infrared spectroscopy of heated gases and vapors.
MedLine Citation:
PMID:  17503910     Owner:  NLM     Status:  MEDLINE    
In absorption spectroscopy, infrared spectra of heated gases or condensed samples in the vapor phase are usually recorded with a single pass heated gas cell. This device exhibits two orders of magnitude lower sensitivity than the high-temperature multipass cell presented in this article. Our device is a novel type of compact long path absorption cell that can withstand aggressive chemicals in addition to temperatures up to 723 K. The construction of the cell and its technical features are described in detail, paying special attention to the mechanisms that compensate for thermal expansion and that allow the user to vary the optical path length under any thermal or vacuum condition. The cell may be used with a laser source or implemented within a Fourier transform infrared spectrometer. Its design is compatible with optical arrangements using astigmatic mirrors or spherical mirrors in a Herriott configuration. Here we implement a homebuilt Herriott-type cell with a total optical path length of up to 35 m. In order to demonstrate the feasibility of the cell, methane and water vapor absorption lines showing dissimilar temperature effects on line intensity were recorded with the help of a mid-infrared laser source tunable between 3 and 4 microm. Emphasis is put on lines that are too weak to be recorded with a single pass cell.
R Bartlome; M Baer; M W Sigrist
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Review of scientific instruments     Volume:  78     ISSN:  0034-6748     ISO Abbreviation:  Rev Sci Instrum     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2007-05-16     Completed Date:  2007-06-22     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0405571     Medline TA:  Rev Sci Instrum     Country:  United States    
Other Details:
Languages:  eng     Pagination:  013110     Citation Subset:  IM    
Institute for Quantum Electronics, ETH Zurich, Schafmattstrasse 16, 8093 Zurich, Switzerland.
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MeSH Terms
Gases / analysis*
Hot Temperature
Methane / analysis*
Spectroscopy, Fourier Transform Infrared* / instrumentation,  methods
Water / chemistry*
Reg. No./Substance:
0/Gases; 74-82-8/Methane; 7732-18-5/Water

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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