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  • 1
    Electronic Resource
    Electronic Resource
    Vibration-induced first-order Stark effect in tetrahedral molecules: SiH4 and SiF4 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 730-737 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The vibration-induced permanent dipole moments in SiH4 and in SiF4 have been determined by measuring the first-order Stark effect on the infrared vibration–rotation lines in the triply degenerate ν4 and ν3 fundamental bands, respectively. Microwave modulation sidebands on CO2 laser lines were generated with sufficient power and spectral purity to be used as the frequency-tunable infrared source for the sub-Doppler saturation Lamb dip measurements. Theory is also presented for calculating the dipole moment matrix elements in the excited vibrational state. From the observed Stark splittings, the vibration-induced permanent dipole moment P has been determined to be 1.46(5)×10−2 D for SiH4 in the v4=1 state, and 4.21(12)×10−2 D for SiF4 in the v3=1 state. In addition, Watson's coefficient for the rotation-induced permanent dipole moment θxyz has been determined to be 2.97(19)×10−5 D in SiH4 (v4=1).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454152
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  • 2
    Electronic Resource
    Electronic Resource
    Vibrationally induced nuclear quadrupole coupling in the v3=1 state of 189OsO4 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5644-5648 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electric nuclear quadrupole hyperfine structure arising from a quadrupolar nucleus at the center of tetrahedral molecules, such as 189OsO4, is symmetry forbidden. However, through vibration–rotation distortion a small nuclear quadrupole coupling is induced. The hyperfine structure due to the vibrationally induced eqQ has been measured for a number of P- and R-branch transitions in the ν3 fundamental of 189OsO4, by using inverse Lamb dip spectroscopy. Microwave modulation sidebands of CO2 laser lines have been used as the tunable infrared radiation. From the analysis of the observed hyperfine structure patterns, the values of the scalar and tensor coupling constants have been determined to be χVs=−4.103±0.048 MHz and χVt=−3.090±0.059 MHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453537
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  • 3
    Electronic Resource
    Electronic Resource
    Dissociation of CD3I at 248 nm studied by diode laser absorption spectroscopy (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 6234-6242 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Transient diode laser absorption spectroscopy has been used to monitor the rotational and vibrational populations of CD3 radicals following photodissociation of CD3I by 248 nm light. Rotational lines in the ν2=1–0, 2–1, 3–2, and 4–3 bands have been analyzed to give time-dependent CD3 populations following photodissociation of 100 mTorr samples of neat CD3I. Prompt absorption signals are small, but positive for all observed rotational lines of all observed bands, providing clear evidence against population inversion in the low levels of the ν2 vibration of methyl photoproducts. The vibrational population distribution in ν2 a few μs after photodissociation is 4:3:2 for v=0:1:2 with about 20% uncertainties. A strong variation in time dependence with rotational level is consistent with an initially hot rotational distribution (≥2000 K) that cools on the μs time scale of methyl translational moderation in the bath of undissociated methyl iodide. We believe the origin of the rotational excitation to be translation–rotation energy transfer, rather than the photodissociation itself. Time-resolved Doppler line shapes provide an independent view of the translational energy loss.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456340
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  • 4
    Electronic Resource
    Electronic Resource
    Diode laser spectroscopy of the ν2 band of CD3 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 5300-5306 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: CD3 radicals were generated by excimer laser photolysis (248 nm) of CD3 I, and the transient populations detected by diode laser absorption using a gated integrator signal averager. The v2 =1←0, 2←1, and 3←2 bands of the CD3 radical were observed, and band center frequencies were determined to be 457.8133(11), 507.9311(19), and 542.4510(29) cm−1, respectively. Observed transitions were fitted, by least squares analysis, to yield rotational and centrifugal distortion constants and spin–rotation parameters, and results are compared to theory. Measurements were also carried out of the time dependence of the vibration–rotation level populations as a function of vibrational excitation and spin component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454588
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  • 5
    Electronic Resource
    Electronic Resource
    Extended measurements of the ν2 band of CD3 and the determination of the vibrational potential function for methyl (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2125-2133 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Measurements in the ν2 (umbrella) vibrational spectrum of CD3 are reported. The data include transitions up to and including the v2=4–3 bands and cover a wider range of rotational excitation than has been previously reported [Frye, Sears, and Leitner, J. Chem. Phys. 88, 5300 (1988)]. The spectroscopic data have been combined with all previously published data pertaining to the methyl radical and an estimate of the vibrational potential function for the species has been made. From this, we predict the positions of so far unobserved vibrational bands for all the various symmetric isotopic modifications and also extract an equilibrium structure. Preliminary results on the population distribution of v2 levels produced on the photofragmentation of acetone-d6 at 193 nm are reported and it is suggested that the methyl v3=1 and v3=0 levels may be produced in this reaction with a population inversion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456006
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  • 6
    Electronic Resource
    Electronic Resource
    Room-temperature growth of AlN thin films by laser ablation (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 2234-2236 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Excimer laser ablation of compressed AlN powder has been used to grow thin AlN films at room temperature on a variety of substrates. The films have a band gap of 6.15 eV as measured by UV absorption. Examination with a scanning electron microscope and an optical microscope shows that the films are smooth. The IR spectrum has an absorption characteristic of AlN. Growth rates are extremely rapid, exceeding 70 nm/min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107040
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