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  • 1
    Electronic Resource
    Electronic Resource
    Predissociation linewidths of the (1,0)–(12,0) Schumann–Runge absorption bands of O2 in the wavelength region 179–202 nm (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 842-849 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A nonlinear least-squares method of retrieving predissociation linewidths from the experimental absolute absorption cross sections of Yoshino et al. [Planet. Space Sci. 31, 339 (1983)] has been applied to the (1,0)–(12,0) Schumann–Runge bands of oxygen. Predissociation linewidths deduced for the Schumann–Runge bands are larger than the theoretical predictions of Julienne [J. Mol. Spectrosc. 63, 60 (1976)] and the latest measurements of Lewis et al. [J. Quant. Spectrosc. Radiat. Transfer 36, 187 (1986)]. The larger linewidths found will have an impact on calculations of solar flux penetration into the Earth's atmosphere and of the photodissociation rates of trace species in the upper atmosphere. Systematic variation of predissociation linewidths with rotational quantum number is observed in the bands (v',0) with v'=6, 8, 9, 11, and 12.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458117
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  • 2
    Electronic Resource
    Electronic Resource
    Comment on predissociation of O2 in the B state (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 6538-6540 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457372
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  • 3
    Electronic Resource
    Electronic Resource
    Predissociation of oxygen in the B 3Σ−u state (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 1787-1792 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The predissociation linewidths and level shifts of vibrational levels of three oxygen isotopic molecules 16O2, 16O18O, and 18O2 arising from the interactions of the B 3Σ−u state with the four repulsive states 5Πu, 3Σ+u, 3Πu, and 1Πu, have been calculated. A set of parameters characterizing these interactions has been determined. Good agreement between calculated and experimental predissociation widths and shifts has been obtained for all the three isotopic molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463165
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  • 4
    Electronic Resource
    Electronic Resource
    Predissociation linewidths of the (3,0)–(11,0) Schumann–Runge absorption bands of 18O2 and 16O 18O in the wavelength region 180–196 nm (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 5539-5543 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Predissociation linewidths of the (3,0)–(11,0) Schumman–Runge bands of 18O2 and 16O 18O in the wavelength region 180–196 nm have been obtained from the published measurements of the absolute absorption cross sections of Yoshino et al. [Planet. Space Sci. 36, 1201 (1988); 37, 419 (1989)] and spectroscopic constants of these molecules of Cheung et al. [J. Mol. Spectrosc. 131, 96 (1988); 134, 362 (1989)]. The linewidths are determined as parameters in the nonlinear least-squares fitting of calculated to measured cross sections. Predissociation maxima are found at upper vibrational levels with v'=4, 7, and 10 for 18O2 and for 16O 18O. Our predissociation linewidths are mostly greater than previous experimental values for both isotopic molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459623
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  • 5
    Electronic Resource
    Electronic Resource
    Rotational dependence of the predissociation linewidths of the Schumann–Runge bands of O2 (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 1086-1092 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The predissociation linewidths of vibrational levels v=0 –12 for 16O2, 16O18O, and 18O2 molecules in the B 3Σu− state with rotational quantum numbers N≤20 have been calculated taking into account the spin–orbit interactions of the B 3Σu− state with the 5Πu, 3Σu+, 3Πu, and 1Πu states, and the rotational coupling with the 3Πu state. The predissociation linewidths exhibit systematic variations with rotational quantum number for different vibrational levels. Good agreement between most of the calculated and experimental linewidths has been obtained for all three isotopic molecules, with the exception of the set of linewidths of 16O2 for v=0 and 2. The agreement can be improved by adjustment of the 1Πu potential and the strength of the spin–orbit interaction between the B 3Σu− and 1Πu states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466204
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  • 6
    Electronic Resource
    Electronic Resource
    Study of electrical characteristics of polyoxides grown by rapid thermal oxdidation (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1675-1677 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin (∼18 nm) polyoxide films have been grown on phosphorus-implanted polycrystalline silicon (poly-Si) by rapid thermal oxdiation (RTO). With an emphasis on the bias polarity dependence, we have studied the electrical characteristics of polyoxides, such as leakage current, breakdown field, and charge trapping. In comparison with polyoxides grown in conventional furnace, RTO polyoxides exhibit a significantly reduced leakage current. In addition, the dielectric breakdown strength and breakdown field distribution have been improved. When electrons were injected from the top poly-Si/SiO2 interface, RTO polyoxide shows a reduced trapping rate. However, when electrons were injected from the SiO2/bottom poly-Si interface, RTO polyoxide shows an increased trapping rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104135
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  • 7
    Electronic Resource
    Electronic Resource
    Isotopic dependence of predissociation linewidths in the Schumann-Runge bands of oxygen (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 2369-2371 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: It is demonstrated that, according to semi-classical theory, the isotopic dependence of the predissociation linewidths in the Schumann-Runge bands of oxygen cannot be removed by simple scaling of the reduced mass. This is in contrast to the isotopic dependence of the predissociated vibrational energy levels. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469660
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  • 8
    Electronic Resource
    Electronic Resource
    Methyl and tert-butyl reorientation and distributions of activation energies in molecular solids. A nuclear spin-relaxation study in 2,4- and 2,5-di-tert-butylhydroxybenzene (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 1959-1968 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have measured proton Zeeman relaxation rates R in the 2,4- and 2,5-isomers of di-tert-butylhydroxybenzene (DTHB) in the solid state. R was measured as a function of temperature T at proton Larmor frequencies of ω/2π=8.50, 22.5, and 53.0 MHz. The T ranges were from 78 K to just below the melting points of 2,4- and 2,5-DTHB, 385 and 323 K, respectively. The 2,5-DTHB R vs T and ω can be interpreted qualitatively in terms of three Bloembergen–Purcell–Pound (BPP) spectral densities, one for each of the three types of rotors in the molecule. The quantitative agreement is poor but a good fit is obtained using either a Davidson–Cole (DC) or Frölich spectral density, still preserving the three rotor types. The implications of this are discussed. The BPP and DC spectral densities fail completely in interpreting R vs T and ω for 2,4-DTHB whereas good quantitative fits are obtained using a Frölich spectral density. The distributions of activation energies characterizing the three rotor types are so wide for the Frölich spectral density fit of the 2,4-DTHB data that the individual rotor types lose their identity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.450403
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  • 9
    Electronic Resource
    Electronic Resource
    Laser spectroscopy of NiBr: Ground and low-lying electronic states (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 117 (2002), S. 3694-3700 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Four electronic states of NiBr have been studied using the technique of laser vaporization/reaction with supersonic cooling and laser induced fluorescence (LIF) spectroscopy. NiBr molecules were produced by reacting laser ablated nickel atoms and ethyl bromide (C2H5Br). High resolution LIF spectrum between 724 and 810 nm was recorded, which consists of the (2,0), (1,0), and (0,0) bands of the [13.2] 2Π3/2–X 2Π3/2 system and the [13.2] 2Π3/2–A 2Δ5/2 system, and also the (v,0) with v=0–4 bands of the [12.6] 2Σ+–X 2Π3/2 system. Spectra of four isotopic molecules: 58Ni79Br, 58Ni81Br, 60Ni79Br, and 60Ni81Br were observed and analyzed. Least squares fit of rotationally resolved transition lines yielded accurate molecular constants for the X 2Π3/2, A 2Δ5/2, [12.6] 2Σ+, and [13.2] 2Π3/2 electronic states of NiBr. The bond length, r0, measured for the X 2Π3/2 and A 2Δ5/2 states is 2.196 28 and 2.164 45 Å, respectively. A molecular orbital diagram has been constructed to explain the four observed electronic states. This work represents the first high-resolution spectroscopic study of NiBr. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1494777
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  • 10
    Electronic Resource
    Electronic Resource
    Predicted predissociation linewidths in the Schumann–Runge bands of O2 compared with recent high resolution measurements (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 7969-7975 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We derive and use new parameters to quantify the semiempirical expressions of Julienne and Krauss [J. Mol. Spectrosc. 56, 270 (1975)] for the 5Πu, 3Σu+, 3Πu, and 1Πu potentials that predissociate the rovibrational levels of the B 3Σu− state of O2. Using the new parameters in the model of Julienne and Krauss we evaluate fine-structure predissociation linewidths for the Schumann–Runge bands that terminate on the v=13,14 rovibrational levels of the B 3Σu− state. We compare these linewidths and those calculated with several existing sets of parameters with the measurements of Dooley et al. [J. Chem. Phys. 109, 3856 (1998)]. We also show the deperturbing effect of the level shifts, calculated with the new parameters, on the energies of the rotationless v=0–17 vibrational levels of the B 3Σu− state. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1361255
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