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  • 7.65G  (2)
  • CH3OH  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Photoacoustic detection of NH3 in power plant emission with a CO2 laser (1989)
    Springer
    Applied physics 49 (1989), S. 91-97 
    Details
    ISSN: 1432-0649
    Keywords: 7.65G ; 42.55 ; 86.70G ; 86.70L
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper describes a photoacoustic spectrometer for detection of NH3 in power plant emission with a detection limit below 1 ppm. The radiation source is a tunable CO2 waveguide laser, and detection is performed at reduced pressure, where the vibration-rotation lines of NH3 are essentially Doppler broadened. Immunity against interference is ensured by recording a characteristic spectral profile, and problems associated with the high concentration of CO2, and the associated line center absorption are eliminated by utilizing the effect of kinetic cooling on the photoacoustic phase. A computerized spectrometer has been constructed and tested under realistic conditions at a Danish power plant operating a test facility for selective non-catalytic reduction of NO x . Results of this field test are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332267
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Photoacoustic measurements of Lorentz broadening in CO2 between 25° C and 450° C (1991)
    Springer
    Applied physics 53 (1991), S. 170-179 
    Details
    ISSN: 1432-0649
    Keywords: 33.70Jg ; 34.50Ez ; 7.65G
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A variable temperature photoacoustic cell has been constructed and tested by studying the interplay of CO2, H2O, and NH3 in synthetic smoke. Saturation effects for CO2 and NH3 have been modeled and compared with experiments, and results are obtained for the vibrational relaxation rate associated with NH3-H2O collisions. The cell has been used for studying the temperature dependence of self-broadening and N2 broadening of CO2 lines. The temperature dependence of the scattering rate is well described by a T −n law with n=0.77 in both cases. This result agrees with previous results obtained by tunable diode laser spectroscopy, but disagrees with results obtained by indirect methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00330233
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Methanol laser lines from torsionally excited co stretch states, and from OH-bend, CH3-rock, and CH3-deformation states (1986)
    Springer
    International journal of infrared and millimeter waves 7 (1986), S. 1605-1629 
    Details
    ISSN: 1572-9559
    Keywords: optically pumped far infrared laser ; CH3OH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using a quasi-CW CO2 oscillator-amplifier combination with peak power 300 Watt, we have generated FIR laser emission in weak absorption bands of CH3OH. 40 new lines are reported, and their wavelengths are measured with a relative accuracy of 5×10−5. A total of 72 lines are assigned. 34 of these involve torsional n=1, 2, and 3 states of the CO stretch and the vibrational ground state. The remaining lines are associated with the CH3-rock, OH-bend, and CH3-deformation modes. The latter are located 1460 cm−1 above the ground state, and are pumped by simultaneous vibrational excitation and torsional deexcitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01010761
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  • 4
    Electronic Resource
    Electronic Resource
    Observation and assignment of torsional transitions in FIR emission from optically pumped CH3OH (1983)
    Springer
    International journal of infrared and millimeter waves 4 (1983), S. 707-732 
    Details
    ISSN: 1572-9559
    Keywords: optically pumped far infrared laser ; CH3OH ; internal rotation ; CO stretch vibration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using output coupling by reststrahlen reflection from NaCl we have observed 14 new FIR lines in the wavelength range between 30 μm and 60 μm. Two of them have been identified as torsional n=1→0 transitions in the CO stretch vibration. Together with lines previously reported in the literature they are the basis for an identification of 41 FIR lines associated with torsionally excited states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009691
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