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  • 1
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    The pressure broadening of NO2 in the millimeter and submillimeter wave spectral region (1990)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Pressure-broadening parameters for 19 transitions of the millimeter and submillimeter wave spectrum of NO2 have been obtained experimentally. Results for broadening by N2, O2, and He are presented and compared with earlier theoretical calculations of the N2 and O2 parameters. A discussion of the relation between theoretical calculations and experimental measurements is presented.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073); 43; 365-369
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  • 2
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    Laboratory measurement of the P(2,1) submillimeter transition frequency of H3O(+) (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The molecular ion H3O(+) is predicted to be an important component of the gas phase of interstellar clouds where it is calculated to be one of the most abundant molecular ions. Its detection would provide an indirect method of determining the abundance of the crucial species H2O. This fundamental molecule has no convenient low-lying transitions in the microwave or millimeter regions of the spectrum which can be excited under the normal low temperature conditions present in the interstellar medium. It is believed that the P(2,1) transition of H3O(+) in absorption at a frequency of 307 192.41 (5) MHz has been detected. The H3O(+) ion was produced in a magnetically enhanced negative glow discharge source.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics (ISSN 0021-9606); 83; 1428
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  • 3
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    Measurement of the J = 0-1 rotational transitions of three isotopes of ArD(+) (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The rotational transitions of all three isotopic species of ArD(+) in samples containing the Ar isotopes in their natural abundances have been measured by means of millimeter and submillimeter techniques that employ a magnetically enhanced abnormal glow discharge. All three transition frequency measurements were made from digitally averaged signals detected through a lock-in amplifier with a 10-msec time constant. The Ar-4OD(+) transition was easily visible in real time on an oscilloscope with SNR of about 15. It is noted that the observed transition of Ar-38D(+) is more than five orders of magnitude weaker than that due to HCO(+).
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics (ISSN 0021-9606); 79; Aug. 15
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  • 4
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    Millimeter and submillimeter spectra of HCO/+/ and DCO/+/ (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The J = 0-1 transitions of six different isotopic forms of the HCO(+) molecular ion, which were investigated by Woods et al. (1975), are considered. The extension of this work into the shorter millimeter and submillimeter region is reported here, as is the measurement of these spectra through J = 4-5 for HCO(+) and J = 5-6 for DCO(+). It is noted that these measurements can be used to determine accurate rotational constants and rest frequencies for these astrophysically important species. Tables listing the observed rotational constants and spectral constants of HCO(+) and DCO(+) are included.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 75; Oct. 15
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  • 5
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    Prediction and assignment of the FIR spectrum of hydrogen peroxide (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Millimeter and submillimeter microwave studies are used to predict and assign the FIR rotational-torsional spectrum of hydrogen peroxide. Special attention is given to the strong Q-branch features that have recently been used by Traub and Chance to place an upper limit on the atmospheric abundance of hydrogen peroxide. In addition, 67 new transitions are reported in the 400-1000 GHz region.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073); 32; 325-333
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  • 6
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    The millimeter and submillimeter spectrum of NO2 - A study of electronic effects in a nonsinglet light asymmetric rotor (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 77; July 1
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  • 7
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    The laboratory millimeter and submillimeter spectrum of HCO (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The rotational absorption frequencies of 68 new lines from the HCO radical in its ground electronic state have been measured in the millimeter and submillimeter spectral region. The large zero-field data set acquired has allowed the complex spectrum of this light asymmetric rotor with unpaired electronic spin and magnetic hyperfine interactions to be completely analyzed to within experimental accuracy for the first time. The wide range of states observed provides a highly accurate map of the rotational frequencies of the formyl radical, which should enable the abundance and excitation of interstellar HCO to be examined in detail.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics (ISSN 0021-9606); 80; 95-101
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  • 8
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    Millimeter and submillimeter spectrum of NO+ (1982)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Chemical Physics; 77; Oct. 15
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  • 9
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    The submillimeter-wave spectrum of propionitrile (C2H5CN) (1994)
    In:  Other Sources
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    Publication Date: 2019-08-27
    Description: The laboratory millimeter-wave and submillimeter-wave rotational spectrum of propionitrile (ethyl cyanide, C2H5CN) in its ground vibrational state has been extended through J = 70 and K(sub a) = 36. Transitions measured in this study are in the frequency range 250-610 GHz. A fit of 952 transitions including 732 new measurements to a Watson A-reduced Hamiltonian has yielded a complete set of quartic and sextic distortion constants, in addition to six octic distortion constants. Internal rotation and hyperfine splittings have not been resolved, so they are not included in the analysis. Predicted transition frequencies for a large number of additional transitions of interest to radioastronomers are provided.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: The Astrophysical Journal: Supplement Series (ISSN 0067-0049); 93; 2; p. 589-610
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  • 10
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    An extension of the high-resolution millimeter- and submillimeter-wave spectrum of methanol to high angular momentum quantum numbers (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The high-resolution laboratory millimeter- and submillimeter-wave spectra of C-12H(3)OH and C-13H(3)OH have been extended to include transitions involving significantly higher angular momentum quantum numbers than studied previously. For C-12H(3)OH, the data set now includes 549 A torsional substate transitions and 524 E torsional substate transitions through J is not greater than 24, exclusive of blends. For C-13H(3)OH the data set now includes 453 A torsional substate transitions and 440 E torsional substate transitions through J is not greater than 24, exclusive of blends. The extended internal axis method Hamiltonian has been used to analyze the transitions to experimental accuracy. The molecular constants determined by this approach have been used to predict accurately the frequencies of many transitions through J = 25 not measured in the laboratory.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Astrophysical Journal Supplement Series (ISSN 0067-0049); 82; 1, Se; 405-444
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