Infrared linewidth and line position measurements using diode lasers with internal calibration
Journal Article
·
· Appl. Spectrosc.; (United States)
Measurements in the infrared region using semiconductor lasers, particularly as applied to atmospheric pollution monitoring, depend critically on the availability of reliable line positions and linewidth information. We demonstrate a unique internal calibration technique such that spectral locations can be determined accurately, to the order of the monochromaticity of the laser. This is based on low-pressure absorption measurements and subsequent fitting of a Voigt profile and determining the Doppler component. With this technique, we are able to determine the self- and the N/sub 2/-broadening parameters of the NH/sub 3/ line at 852.7 cm/sup -1/ to be 26.2 +- 0.4 MHz Torr/sup -1/ and 5.2 +- 0.1 MHz Torr/sup -1/, respectively. Also, the spectral locations for several SO/sub 2/ lines in the 1180.1 cm/sup -1/ region were determined accurately.
- Research Organization:
- Iowa State Univ., Ames
- OSTI ID:
- 5584443
- Journal Information:
- Appl. Spectrosc.; (United States), Journal Name: Appl. Spectrosc.; (United States) Vol. 35:6; ISSN APSPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
ABSORPTION SPECTROSCOPY
AMMONIA
CALIBRATION
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
ELEMENTS
HYDRIDES
HYDROGEN COMPOUNDS
INFRARED RADIATION
LASERS
LINE BROADENING
LINE WIDTHS
NITROGEN
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SPECTROSCOPY
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
47 OTHER INSTRUMENTATION
ABSORPTION SPECTROSCOPY
AMMONIA
CALIBRATION
CHALCOGENIDES
ELECTROMAGNETIC RADIATION
ELEMENTS
HYDRIDES
HYDROGEN COMPOUNDS
INFRARED RADIATION
LASERS
LINE BROADENING
LINE WIDTHS
NITROGEN
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SPECTROSCOPY
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES