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  • 1
    Electronic Resource
    Electronic Resource
    Lamb dip and infrared–radio frequency double resonance spectroscopy of 188OsO4 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2509-2512 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The frequency of seven rovibrational transitions in the ν3 band, Q branch of 188OsO4 have been measured with high accuracy. The spectrometer used consists of two CO2 lasers [∼3 W on the 10R(0)], the first of which is stabilized on the 4.3 μm fluorescence Lamb dip of the CO2 and the second on the saturated absorption dip of the rovibrational transitions of 188OsO4. The OsO4 transition frequencies are obtained combining the known frequency of the first laser with the measured frequency of the beat note between the two laser beams. For the assignment of the transitions the recent Fourier transform analysis by Bobin et al. [J. Mol. Spectrosc. 122, 229 (1987)] was used. The access to the 10R(0) laser line has made it possible to investigate, for the first time, the Q branch of the ν3 band of OsO4 in a sub-Doppler regime. Furthermore, the tetrahedral fine structure in the ground and in the ν3 state has been analyzed using the infrared–radio frequency double resonance technique. The tetrahedral splitting constants, Dt for the ground state and Z3t for the ν3 state, have been calculated with higher accuracy than in previous works.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459875
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of high-frequency rotational transitions of H2O+ in its ground state by far-infrared laser magnetic resonance (LMR) spectroscopy (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 9744-9752 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Thirteen new rotational transitions of H2O+ in the (0,0,0) level of the X˜ 2B1 state have been measured in the wavenumber region between 80 and 200 cm−1 (50 and 120 μm) by far-infrared laser magnetic resonance (LMR) spectroscopy. LMR data measured previously between 25 and 90 cm−1 (110 and 400 μm), as well as optical and infrared combination differences, have been combined with the new LMR data in a weighted least-squares analysis using an A-reduced expression of the rotational-fine structure Hamiltonian. Thirty-two molecular constants were simultaneously determined, some sextic centrifugal distortion parameters and some quartic and sextic spin-rotation parameters for the first time. From this improved set of molecular parameters, very accurate calculations of rotational term values and zero-field predictions of the 111–000 transition, including hyperfine structure, have been performed. Moreover, the electronic g-tensors and the hyperfine coupling constants are consistent with ab initio calculations which had been carried out for these constants. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477644
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  • 3
    Electronic Resource
    Electronic Resource
    The far infrared spectrum of magnesium hydride (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 1935-1937 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational spectrum of MgH in its ground 2∑ state has been observed for the first time using a new tunable far infrared spectrometer. The molecular constants derived are of sufficient accuracy to permit astrophysical identification of this species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450445
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  • 4
    Electronic Resource
    Electronic Resource
    Far-infrared self-broadening and pressure shift measurements of methyl cyanide (1993)
    Springer
    International journal of infrared and millimeter waves 14 (1993), S. 1643-1655 
    Details
    ISSN: 1572-9559
    Keywords: far-infrared spectrometer ; methyl cyanide ; pressure broadening ; pressure shift
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Pressure shifts and self-broadening parameters of the J=43←42, J=44←43, J=56←55 and J=68←67 sub-bands of the1A1 ground state of CH3C14N up to K=10 were determined using the NIST tunable far-infrared (TuFIR) spectrometer. The pressure shift agrees well with theoretical predictions made using Anderson-Tsao-Curnutte theory. The self-broadening parameter shows the expected K depencence. However, the predictions are systematically too large for decreasing J. The influence of the TuFIR power spectrum on the derived experimental parameters was evaluated and a comparison was made between two-wave and three-wave mixing spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02096222
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  • 5
    Electronic Resource
    Electronic Resource
    New Far-Infrared Laser Lines and Frequency Measurements of Acetaldehyde and Vinyl Fluoride (1998)
    Springer
    International journal of infrared and millimeter waves 19 (1998), S. 719-726 
    Details
    ISSN: 1572-9559
    Keywords: far-infrared laser ; frequency measurement ; acetaldehyde (CH3CHO) ; vinyl fluoride (CH2CHF) ; cw CO2 laser ; new lines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Eight far-infrared laser lines have been obtained by optically pumping acetaldehyde (CH3CHO) and nine by pumping vinyl fluoride (CH2CHF) with a cw CO2 laser. The far-infrared laser structure used a metal-dielectric waveguide cavity. This is the first reported observation of four of the laser lines in acetaldehyde. In this work, we measure the frequency, optimum pressure of operation, relative intensity, relative polarization, and pump offset from CO2 laser-line center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022646225018
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  • 6
    Electronic Resource
    Electronic Resource
    Far infrared laser frequencies of CH3OD and N2H4 (1991)
    Springer
    International journal of infrared and millimeter waves 12 (1991), S. 1161-1166 
    Details
    ISSN: 1572-9559
    Keywords: CH3OD ; N2H4 ; molecular laser lines ; laser frequency measurements ; optically pumped far infrared lasers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The frequencies of 26 laser lines with wavelengths between 57 and 534 μm have been measured in the optically pumped laser gases CH3OD and N2H4. A pair of stabilized cw 12CO 2 lasers was used as a frequency standard for the heterodyne frequency measurements. Seven of the 26 lines are new.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01008558
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  • 7
    Electronic Resource
    Electronic Resource
    Optically-Pumped Far-Infrared Laser Lines in Hydrazine, Methanol, Heavy Water, and Ammonia: New Laser Lines and Frequency Measurements (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 725-730 
    Details
    ISSN: 1572-9559
    Keywords: hydrazine ; methanol ; heavy water ; ammonia ; new far-infrared laser lines ; optically pumped far-infrared laser ; laser frequencies ; relative intensity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A far-infrared laser cavity designed to favor short-wavelength laser lines was used to generate optically-pumped far-infrared laser radiation. New far-infrared laser lines were discovered in hydrazine, heavy water, ammonia, and several short-wavelength lines previously discovered in methanol were observed. Wavelength, frequency, and relative intensity measurements were performed on laser lines in the wavelength range 42.4 to 253.7 μm. Each far-infrared frequency measurement was obtained by mixing the far-infrared radiation with radiation from two reference CO2 lasers and from a microwave synthesizer in a metal-insulator-metal diode. The pump laser was a high-Q Fabry Perot resonator oscillating on 275 grating-selected laser lines including regular, sequence, and hot band lines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026456425454
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  • 8
    Electronic Resource
    Electronic Resource
    Laser Lines and Frequency Measurements of Fully Deuterated Isotopomers of Methanol (1998)
    Springer
    International journal of infrared and millimeter waves 19 (1998), S. 465-473 
    Details
    ISSN: 1572-9559
    Keywords: 12CD3OD ; 13CD3OD ; fully deuterated isotopomers ; new laser lines ; far-infrared laser ; frequency measurement ; CO2 laser pump
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fully deuterated isotopomers of methanol (12CD3OD and 13CD3OD) were optically pumped with a CO2 laser. Five new far-infrared laser lines were discovered in 12CD3OD and 25 in 13CD3OD in the range 43.697 to 719.426 μm. The frequencies of these new and some previously reported laser lines, the pump offset, the relative polarization, the relative intensity, and the optimum pressure of operation were measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022511827416
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  • 9
    Electronic Resource
    Electronic Resource
    Optically-Pumped Far-Infrared Laser Lines of Methanol Isotopomers: 12CH3OH, 12CH3OD, and 12CH2DOH (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 731-737 
    Details
    ISSN: 1572-9559
    Keywords: 12CD3OH ; 12CH3OD ; 12CH2DOH ; new far-infrared laser lines ; optically-pumped far-infrared laser ; laser frequencies ; relative intensity ; relative polarization ; pump-frequency offset
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Twenty-seven new far-infrared laser lines from the isotopomers of methanol: 12CD3OH, 12CH3OD, and 12CH2DOH, were obtained by optically-pumping the molecules with an efficient cw CO2 laser. The CO2 laser provided pumping from regular, sequence, and hot-band CO2 laser transitions. The 2-m long far-infrared cavity was a metal-dielectric waveguide closed by two, flat end mirrors. Several short-wavelength (below 100 μm) lines were observed. The frequencies of 28 laser lines observed in this cavity (including new lines and already known lines) were measured with a fractional uncertainty limited by the fractional resetability of the far-infrared laser cavity, of 2 parts in 107.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026408509524
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  • 10
    Electronic Resource
    Electronic Resource
    Optically Pumped Far-Infrared Laser Lines of Methanol Isotopomers: 12CD3OH, 12CH3OD, and 12CH2DOH (2000)
    Springer
    International journal of infrared and millimeter waves 21 (2000), S. 477-483 
    Details
    ISSN: 1572-9559
    Keywords: 12CD3OH ; 12CH3OD ; 12CH2DOH ; new far-infrared laser lines ; optically pumped far-infrared laser ; laser frequencies ; relative intensity ; relative polarization ; pump-frequency offset
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Twenty-seven new FIR, far-infrared, laser lines from the isotopomers of methanol: 12CD3OH, 12CH3OD, and 12CH2DOH, were obtained by optically pumping the molecules with an efficient cw CO2 laser. The CO2 laser provided pumping from regular, sequence, and hot-band CO2 laser transitions. The 2 m long far-infrared cavity was a metal-dielectric waveguide closed by two, flat end mirrors. Several short-wavelength (below 100 μm) lines were observed. The frequencies of 28 laser lines observed in this cavity (including new lines and already known lines) were measured with a fractional uncertainty limited by the fractional resetability of the far-infrared laser cavity, of 2 parts in 107.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006667300438
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