论文信息 - Diode laser spectroscopy of ammonia overtone transitions

Diode laser spectroscopy of ammonia overtone transitions

SummaryDiode laser spectroscopy of ammonia ro-vibrational overtone transitions has been performed in the near IR, by using direct absorption, wavelength modulation, and two-tone frequency modulation techniques. Pressure broadening coefficients in air, hydrogen, helium and self-broadening have been measured. The high sensitivity of the apparatus permitted the detection of 70 p.p.m. of NH3 in air per meter of path at atmospheric pressure. New lines have been observed in the 719.9 nm band.

[1] G. Herzberg,et al. Infrared and Raman spectra of polyatomic molecules , 1946 .

[2] B. Edĺen. The Refractive Index of Air , 1966 .

[3] L. Moi,et al. Diode laser spectroscopy: Water vapour detection in the atmosphere , 1991 .

[4] Leo W. Hollberg,et al. Using diode lasers for atomic physics , 1991 .

[5] David E. Cooper,et al. Two-tone frequency-modulation spectroscopy with a CO 2 laser , 1990 .

[6] B. Armstrong. Spectrum line profiles: The Voigt function , 1967 .

[7] H. Riris,et al. Comparison of approaches to modulation spectroscopy with GaAIAs semiconductor lasers: application to water vapor. , 1988, Applied optics.

[8] Siu-Hung Chao. The Photographic Infrared Absorption Spectrum of Gaseous Ammonia , 1936 .

[9] U. El-hanany,et al. Tunable diode laser based spectroscopic system for ammonia detection in human respiration , 1987 .

[10] Francesco S. Pavone,et al. Frequency- and wavelength-modulation spectroscopies: Comparison of experimental methods using an AlGaAs diode laser , 1993 .

[11] Thomas F. Gallagher,et al. Two-tone frequency-modulation spectroscopy , 1986 .