Infrared-laser spectroscopy using a long-pathlength absorption cell
Conference
·
OSTI ID:5751341
The absorption measurements in an ordinary cell may require typically a few torr pressure of sample gas. At these pressures the absorption lines are usually pressure-broadened and, therefore, closely spaced transitions are poorly resolved even at diode-laser resolution. This situation is greatly improved in Doppler-limited spectroscopy at extremely low sample pressures. Two very long-pathlength absorption cells were developed to be used in conjunction with diode lasers. They were designed to operate at controlled temperatures with the optical pathlength variable up to approx. 1.5 km. Not only very low sample pressures are used for studies with such cells but also the spectroscopic sensitivity is enhanced over conventional methods by a factor of 10/sup 3/ to 10/sup 4/, improving the analytical capability of measuring particle densities to the order of 1 x 10'' molecules/cm/sup 3/. This paper presents some analytical aspects of the diode laser spectroscopy using the long-pathlength absorption cells in the areas of absorption line widths, pressure broadening coefficients, isotope composition measurements and trace impurity analysis.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5751341
- Report Number(s):
- LA-UR-83-1568; CONF-831025-1; ON: DE83014197
- Country of Publication:
- United States
- Language:
- English
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·
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
ACTINIDE COMPOUNDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
EQUIPMENT
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HEAVY NUCLEI
INFRARED SPECTRA
ISOMERIC TRANSITION ISOTOPES
ISOTOPE RATIO
ISOTOPES
LASER SPECTROSCOPY
LINE WIDTHS
MINUTES LIVING RADIOISOTOPES
NUCLEI
RADIOISOTOPES
SPECTRA
SPECTROSCOPY
URANIUM 235
URANIUM 238
URANIUM COMPOUNDS
URANIUM FLUORIDES
URANIUM HEXAFLUORIDE
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES
400104* -- Spectral Procedures-- (-1987)
440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
ACTINIDE COMPOUNDS
ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
EQUIPMENT
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HEAVY NUCLEI
INFRARED SPECTRA
ISOMERIC TRANSITION ISOTOPES
ISOTOPE RATIO
ISOTOPES
LASER SPECTROSCOPY
LINE WIDTHS
MINUTES LIVING RADIOISOTOPES
NUCLEI
RADIOISOTOPES
SPECTRA
SPECTROSCOPY
URANIUM 235
URANIUM 238
URANIUM COMPOUNDS
URANIUM FLUORIDES
URANIUM HEXAFLUORIDE
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES