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  • 1
    Electronic Resource
    Electronic Resource
    Spectra of the rare gas hydrides. IV. Three new bands of argon deuteride involving a low-lying "p'' Rydberg state (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 7093-7110 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Three fairly strong emission bands of ArD at 6100, 6900, and 10 200 cm−1 have been studied at high resolution. They show very different structures: the first exhibits only Q-form branches, the second P, R, O, and S-form branches, and the third Q, S, and O-form branches. The rotational analysis of each of these bands is not trivial, mainly because the upper state of the first which proved to be also the lower state of the second and third is strongly affected by l uncoupling [i.e., transition to Hund's case (d)] and as a result the usual method of combination differences cannot be applied in their analysis. However, more sophisticated combination differences have been found between the three bands which lead to unambiguous assignments of rotational quantum numbers and thus to rotational constants. It was found that the upper state of the 6100 cm−1 band can be most conveniently represented as a p(2Σ,2Π) complex. This assumption, together with the theoretical selection rules for such a case, led to a full understanding of the structure of the three bands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463535
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  • 2
    Electronic Resource
    Electronic Resource
    The far infrared spectrum of C3O2 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 2299-2316 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The far infrared spectrum of carbon suboxide, 12C316O2, has been recorded at a resolution of 0.003 cm−1 in the region from 15 to 130 cm−1 with a Bomem interferometer. Altogether 18 bands involving the excitation of up to 8 quanta in the low frequency quasilinear bending mode ν7 were analyzed rotationally. A total of 1320 far infrared lines together with 231 microwave lines taken from Karyakin et al. [J. Mol. Spectrosc. 94, 283 (1982)] have been fitted to an effective model. Improved effective constants have been obtained for all the l sublevels of v7=0 to 4 and for l=1 of v7=5. Constants have been obtained for the first time for the levels 53 and 55 and some of the l sublevels of v7=6, 7, and 8. Data for the lower lying levels were fitted to a realistic linear model and some data were also fitted to a bent model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460938
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  • 3
    Electronic Resource
    Electronic Resource
    The bending vibrational levels in C2D2 (X˜ 1Σ+g) (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 3407-3414 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Improved sets of data have been recorded and analyzed in order to study the bending rovibrational energy levels of C2D2, in the regions of the ν5–ν4 difference band (FIR) and of the ν5 fundamental band (IR). A matrix model is setup to deal with a Darling–Dennison coupling between sets of bending levels as well as with the usual l-type resonances. A simultaneous fit of the new data together with earlier microwave measurements produces an extended set of very accurate parameters, including for the first time in C2D2 s45 and qkt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459763
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  • 4
    Electronic Resource
    Electronic Resource
    The torsional spectrum of CD3CD3 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2387-2394 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The far-infrared spectrum of gaseous CD3CD3 has been measured in the region of the torsional fundamental under relatively large pressure-path length conditions. The observations were made using a modified Bomem spectrometer at a resolution of 0.016 cm−1, an absorption path of 20 m, and a gas temperature and pressure of 168 K and 80 Torr, respectively. The prominent features of the spectrum are the P, Q, and R branches of the torsional fundamental (v4=1←0) and the Q branch of the first torsional overtone (v4=2←1). The P and R branches of the fundamental consist of peaks about 0.2 cm−1 wide due to unresolved structure. In addition, a very high resolution (0.0014 cm−1) spectrum of the lowest lying degenerate fundamental ν9 of CD3CD3 was obtained. From the combined intensity and frequency analyses of the far-infrared spectrum and 442 lower state combination differences in ν9 and its associated hot band ν9+ν4−ν4, the effective leading coefficients V˜3=989.10(68) cm−1 and V˜6=9.47(29) cm−1 in the Fourier expansion of the hindering potential were determined. The rotational constant B was found to be 13 802.658(39) MHz and four distortion parameters were obtained. The torsional dipole constants μ⊥ and μ(parallel)−μ⊥ were determined to be 7.41(74) and −19.9(2.0) μD, respectively. The experimental values of μ⊥ and μ(parallel)−μ⊥ are shown to be in good agreement with values calculated from theoretical expressions. The shape of the torsional bands can be reproduced in detail with the model adopted here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459862
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  • 5
    Electronic Resource
    Electronic Resource
    Overtone and hot-band assignments in the 2{ν3, ν6} levels of CHD3 (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 5508-5518 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Assignments have been carried out for the 2ν3/(ν3+ν6)/2ν6 (triad)←ground state overtone bands and the triad←ν3/ν6 hot-band system of CHD3. A vibrational extrapolation method, using correspondences between a spherical-tensor formalism and the more conventional description of symmetric-rotor spectra, was used to facilitate the assignment and analysis of these bands. The resulting assignments have been confirmed by time-resolved double-resonance measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467169
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  • 6
    Electronic Resource
    Electronic Resource
    Intensity analysis of the torsional spectrum of CH3CH3 (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 3981-3988 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The far-infrared spectrum of gaseous CH3CH3 has been measured in the region of the torsional fundamental under relatively large pressure-path length conditions. Observations were made at resolutions of 0.08, 0.02, and 0.016 cm−1 and under various experimental conditions using two different Fourier transform spectrometers. In addition, a very high resolution (0.0014 cm−1) spectrum of the lowest lying degenerate fundamental ν9 was obtained. From a frequency analysis of the far-infrared spectrum and 737 lower state combination differences in ν9 and its associated hot band ν9+ν4−ν4, an improved set of torsion–rotation parameters was obtained. An intensity analysis of the torsional bands was carried out to obtain torsional dipole moments. The torsional dipole components μ⊥ and (μ(parallel)−μ⊥ ) were determined to be 9.37(70) and −31.7(2.0) μD, respectively. These experimental values are in good agreement with calculated values of μ⊥=10.13 μD and (μ(parallel)−μ⊥ )=−35.10 μD. The shape of the torsional bands can be reproduced in detail with the model adopted here.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462937
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  • 7
    Electronic Resource
    Electronic Resource
    Torsion-rotation far-infrared spectrum of O-18 methanol (1994)
    Springer
    International journal of infrared and millimeter waves 15 (1994), S. 2021-2030 
    Details
    ISSN: 1572-9559
    Keywords: far-infrared ; FT spectroscopy ; methanol ; torsion ; CH3 18OH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract High-resolution Fourier transform spectra have been recorded from 15–470 cm−1 for the far-infrared trosion-rotation band of O-18 methanol in the vibrational ground state. So far, 57 subbands have been assigned in the 15–220 cm−1 region for a wide range of rotational and torsional states, and their J-independent origins have been determined to an estimated accuracy of ±0.01 cm−1. The observed origins were found to deviate in many cases by several tenths of a cm−1 from the values calculated with the previous molecular parameters. Together with 4 known microwave origins, the new data have been fitted to a model torsion-rotation Hamiltonian in order to refine the set ofb-type molecular constants for the ground state. With the new parameter set, the experimental subband origins are reproduced with an rms error of ±0.02 cm−1, representing a substantial improvement over the earlier situation. The spectroscopic results have also been of great assistance with our assignments of optically-pumped FIR laser emission in CH3 18OH, in providing FIR data for checking the identification of the IR-pump/FIR-laser transition systems through combination loop relations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02096274
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  • 8
    Electronic Resource
    Electronic Resource
    Far infrared spectrum of CD3OH methanol from 40–220 CM−1 (1993)
    Springer
    International journal of infrared and millimeter waves 14 (1993), S. 1727-1753 
    Details
    ISSN: 1572-9559
    Keywords: Far-infrared (FIR) ; spectra ; methanol ; CD3OH ; torsion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Fourier transform far-infrared (FTFIR) spectrum of CD3OH has been obtained from 40–220 cm−1 at a resolution of 0.002 cm−1, and partially analyzed. Numerousb-type branches have been assigned in the spectrum, ranging over torsional states fromn=0 to 3. The branches have been fitted toJ(J+1) power-series energy expansions in order to obtainJ-independent branch origins. These in turn have been fitted to the torsion-rotation Hamiltonian, and improved molecular constants have been obtained for the ground vibrational state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02101329
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  • 9
    Electronic Resource
    Electronic Resource
    Assignments of far-infrared laser lines in the CO-stretching state of 0–18 methanol (1994)
    Springer
    International journal of infrared and millimeter waves 15 (1994), S. 1883-1906 
    Details
    ISSN: 1572-9559
    Keywords: far-infrared (FIR) lasers ; FTIR spectroscopy ; methanol ; torsion ; CH3 18OH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Far-infrared (FIR) laser and infrared pump transitions of the O-18 isotopic species of methanol have been assigned for a number of CO2 laser pump lines with the aid of high-resolution Fourier transform spectra in the FIR and CO-stretch band regions. The structures of the FIR laser energy level systems and the transition assignments were established through the use of closed transition combination loops, which also yield improved accuracies for the FIR laser wavenumbers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02096057
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