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  • American Institute of Physics (AIP)  (17)
  • 2015-2019  (1)
  • 1985-1989  (16)
  • 1950-1954
  • 1
    Electronic Resource
    Electronic Resource
    The spectroscopy and molecular dynamics of the high frequency ν16 intermolecular vibrations in HCN---HF and DCN---DF (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 2775-2780 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Gas phase rovibrational analysis of the high frequency intermolecular hydrogen bonded bending overtone 2ν06 [ν0=1132.4783(2) cm−1] in HCN---HF and its corresponding perdeuterated fundamental ν16 [ν0=409.1660(2) cm−1] are reported. Evaluated rovibrational parameters provide the basis for quantitative modeling of the molecular dynamics associated with this vibration. A quantum mechanical calculation permits determination of the quadratic and quartic force constants K66=537(17) and K6666=4.98(12) cm−1 which in turn are used to estimate the pertinent cubic band stretching interaction constants K466=−149.3(50) cm−1 and account for the unexpected behavior in the rotational constant B16. Second order expansion of the vibrational term energies, give X46=−21.61(2), X67=−7.694(1), X66=−14.84(90), g66=−31.04(90) cm−1, neglecting corrections for Fermi resonance. The common isotopic species equilibrium rotational constant Be is evaluated to be 3681.1(11) MHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455030
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  • 2
    Electronic Resource
    Electronic Resource
    Diode laser spectroscopy of the hydrogen bond vibration ν2 OC---HF in a continuous wave supersonic jet (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3335-3339 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The high resolution spectrum of the ν2 (C≡O) stretching vibration in the hydrogen bonded dimer, OC---HF, has been recorded in a continuous wave (cw) supersonic molecular jet using a diode laser spectrometer. Spectroscopic analysis gives the following rovibrational parameters (in cm−1): ν0=2167.69 9 04(11); B0=0.102 200 647(13); D0J =3.244(18)×10−7; B2=0.101 552 5(15); D2J =3.449(36)×10−7. Investigation of observed line profiles allows a lower limit of 0.68 ns to be made for the excited state vibrational predissociative lifetime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457642
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  • 3
    Electronic Resource
    Electronic Resource
    Microphone detection of the predissociation of iodine in a supersonic beam (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4902-4908 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Use of a condenser microphone as a detector in laser–molecular beam studies of excited state molecular dynamics is demonstrated through the observation of predissociation in iodine seeded in a supersonic helium beam. Resultant beam loss with the absorption of cw dye laser radiation in individual rotational lines of the 127I2B 3Π+0u−X 1Σ+g (25,0) transition is measured by the on-axis microphone and shows partially resolved hyperfine structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338357
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  • 4
    Electronic Resource
    Electronic Resource
    A photoluminescence comparison of CdTe thin films grown by molecular-beam epitaxy, metalorganic chemical vapor deposition, and sputtering in ultrahigh vacuum (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 2595-2600 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High perfection CdTe thin films have been grown on (001) InSb and CdTe substrates by molecular-beam epitaxy, metalorganic chemical vapor deposition (MOCVD), and sputtering in ultrahigh vacuum techniques. The quality of the as-grown CdTe films are characterized by 2-K photoluminescence. The spectra show strong and sharp exciton transitions and weak 1.40–1.50-eV defect-related bands. Radiative defect densities of lower than 0.002 are realized. High-resolution spectroscopy shows that the full width at half maximum of the principal bound exciton lines is about 0.1 meV. Such small ρ values and narrow photoluminescence lines have not been previously reported. The largest luminescence efficiency is observed for MOCVD-CdTe films grown on CdTe substrates. A variety of impurities appear to be responsible for the observed radiative transitions in these three kinds of CdTe films. We attempt to assign the observed impurity related lines by a comparison with "known'' impurities in bulk CdTe spectra given in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341648
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  • 5
    Electronic Resource
    Electronic Resource
    Simple color center laser optothermal molecular beam spectrometer for high-resolution infrared spectroscopy (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 1-5 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A broadband tunable single-frequency color center laser optothermal molecular beam spectrometer has been constructed. K components have been resolved for P(18) to R(11) rovibrational transitions in ν1 CH3C≡C–H. The observed transition linewidths are demonstrated to be ≤6 MHz and are determined with a relative precision of ≤10 MHz over the 15-cm−1 frequency segment scanned.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139110
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of rotational constants using nuclear quadrupole hyperfine structure: The microwave spectrum and dipole moment of vinyl iodide, obtained using a computer-controlled spectrometer (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3497-3507 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The microwave spectra of vinyl iodide, CH2=CHI, in its ground and first excited vibrational states, have been measured in the frequency range 20–108 GHz. The spectrometer used was a 100 kHz Stark modulated instrument, interfaced to a Digital Micro-PDP 11/23+ computer for control and for data acquisition and storage; this interfacing is described. The spectrum contains strong a-type transitions and very weak b-type transitions; all contain 127I quadrupole hyperfine structure, with several large perturbations. A procedure specially devised for analysis of such spectra, which takes advantage of the perturbations, was applied to produce accurate values of constants that might otherwise be unobtainable, and to permit assignment of the b-type transitions. Both components of the dipole moment have been measured. The centrifugal distortion constants and inertial defects have been compared with those calculated from a published harmonic force field, modified for the out-of-plane vibrations. A partial structure has been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454729
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  • 7
    Electronic Resource
    Electronic Resource
    The gas phase infrared spectrum of ν1 and ν1−ν4 HCN---HF (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1225-1234 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A continuously tunable single frequency color center laser has been used to investigate the rovibrational static gas phase infrared spectra of the ν1 (H–F stretching vibration) and its hot bands ν1+ν17 −ν17 and ν1+ν4−ν4 in the linear dimer HCN---HF. Observed perturbations in the ν1 and ν1+ν17 −ν17 subbands results from Coriolis interactions of the excited vibrational states ν1 and ν1+ν17 with ν2+2ν4+ν17 and ν2+2ν4+2ν07 , respectively. The influence of Coriolis interactions and vibrationally predissociating excited state lifetimes of 1.06(10)×10−10 s are considered in simulation of the observed band profiles. Molecular and anharmonic cross term parameters associated with investigated vibrational states are also presented. Anharmonic crossterms X(open circle)14 , X(open circle)17 , and X(open circle)47 are evaluated as 8.0252(73), 4.2162(53), and 1.000(49) cm−1, from the available data, including the analysis from the unresolved spectra of ν1−ν4 and ν1−ν4+ν17 −ν17 . The differences of the band origins in ν1 and ν1−ν4 give a value of ν4=168.344(21) cm−1 for the local spacing of the low frequency hydrogen-bond stretching vibration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452212
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  • 8
    Electronic Resource
    Electronic Resource
    Predissociating fundamental vibrations of DCN---DF (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 2518-2524 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Gas phase rovibrational analysis of ν1, ν2, and ν3 vibrationally predissociating fundamentals arising from D–F, D–C, and C≡N stretching vibrations of DCN–DF are reported. The rotational substructure in these fundamentals and a total of five associated hot bands have been assigned, thus providing precisely determined band origin frequencies, distortion, and rotational constants. The following molecular parameters were determined for the three fundamentals (in cm−1): ν0(ν1)=2730.8909(2), ν0(ν2)=2638.1309(1), ν0(ν3)=1943.0046(3), B0=0.111 807(1), D0J =0.1946(4)×10−6, α1=0.001 449(2), α2=−0.003 00(1), α3=−0.000 399(1). The l-type doubling constants q‘7 =0.378(3)×10−3 and q7 =0.380(3)×10−3 cm−1 were determined from the observed splitting in ν2+ν17−ν17. Anharmonic cross terms X027 =−0.600(3) and X037 =−0.61(3) cm−1 were also evaluated. Lifetimes of the ν1, ν2, and ν3 excited states were demonstrated to be 5.7(6)×10−10, 5.2(5)×10−9, and 3.0(5)×10−9 s, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452104
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of dissociation energies and thermal functions of hydrogen-bond formation using high resolution FTIR spectroscopy (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5674-5680 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A technique which employs high resolution Fourier transform infrared spectroscopy is demonstrated for evaluation of hydrogen bond dissociation energies D0 and De. Results for HCN--HF give a D0=20.77(22) and De =28.77(45) kJ/mol which are compared with previously determined values obtained from microwave absolute intensity measurements and ab initio molecular orbital calculations. Rovibrational band information available for HCN--HF also permits evaluation of thermal functions of dimer formation in kJ/mol: ΔU(open circle)298.2 =20.1(2), ΔH(open circle)298.2 =22.6(2), ΔG(open circle)298.2 =59.4(2), ΔS(open circle)298.2 =−0.1235.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453542
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  • 10
    Electronic Resource
    Electronic Resource
    Erratum: Determination of dissociation energies and thermal functions of hydrogen bond formation using high resolution FTIR spectroscopy [J. Chem. Phys. 87, 5674 (1987)] (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6678-6679 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454763
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