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  • Other Sources  (7)
  • ATOMIC AND MOLECULAR PHYSICS  (7)
  • Aerospace Medicine
  • Astronomy
  • Geophysics
  • 1990-1994  (7)
  • 1
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    Cross-sections for the formation of negative ions by electron impact on silane (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Cross-sections and appearance potentials for the production of various negative ion species by electron impact on SiH4 have been measured. They are compared with two previous measurements which widely differ with each other. Hess' law has been applied to predict the various possible channels of dissociation.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: International Journal of Mass Spectrometry and Ion Processes (ISSN 0168-1176); 107; 83-89
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    NASA TECHNICAL REPORTS
  • 2
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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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  • 3
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    The submillimeter-wave spectrum of propionitrile (C2H5CN) (1994)
    In:  Other Sources
    Details
    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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  • 4
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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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  • 5
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    Theoretical infrared spectra of some model polycyclic aromatic hydrocarbons - Effect of ionization (1993)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: In order to test the hypothesis of ionized PAHs as possible carriers of the UIR bands, we realized a computational exploration on selected PAHs of small dimension in order to identify which changes ionization would induce on their IR spectra. In this study we performed ab initio calculations of the spectra of neutral and positively ionized naphthalene, anthracene, and pyrene. The results are significantly important. The frequencies in the cations are slightly shifted with respect to the neutral species, but no general conclusion can be reached from the three molecules considered. By contrast, the relative intensities of most vibrations are strongly affected by ionization, leading to a much better agreement between the calculated CH/CC vibration intensity ratios and those deduced from observations.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 408; 2; p. 530-538.
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  • 6
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    The millimeter- and submillimeter-wave spectrum of (C-13)H3OH revisited (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A total of 245 previously unobserved millimeter- and submillimeter-wave transitions of (C-13)H3OH for J not above 10 were assigned on the basis of measurements with a spectrometer which uses 40-60 GHz klystrons as fundamental radiation sources. These transitions were combined with the previously assigned 596 transitions and were analyzed using a modified internal-axis-method model which treats the symmetric (A) and degenerate (E) substates separately. As a result of the expansion of the (C-13)H3OH data set to cover the same range as the data set of a previous (C-12)H3OH analysis by Anderson et al. (1990), rigid criteria of self-consistency could be applied for the selection and the value of the constants between the isotopic species. The spectral constants obtained were used to make accurate predictions of 562 additional transitions of (C-13)H3OH for v(t) = 0, 1, 2 and rotational quantum number J equal to or less than 12.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Astrophysical Journal Supplement Series (ISSN 0067-0049); 74; 647-664
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  • 7
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    Far-infrared self-broadening in methylcyanide - Absorber-perturber resonance (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: Using tunable far-infrared spectrometers with high-frequency stability and accuracy, the self-pressure broadening and shift of CH3CN are measured. Evidence of absorber-perturber resonance effects on the collisional line shape are obtained. This tests the theoretical model and its possible improvements and also allows predictions of broadening and shift for a large class of molecules. Moreover, the resonance effect produces a theoretical temperature dependence of self-broadening that is different from what is commonly assumed.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Physical Review A (ISSN 1050-2947); 45; 9 Ma
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