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  • Articles  (33)
  • Springer  (22)
  • American Institute of Physics (AIP)  (11)
  • 1990-1994  (33)
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  • Articles  (33)
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  • 1
    Electronic Resource
    Electronic Resource
    Organometallic vapor-phase epitaxy of Hg1−xCdxTe on {211}-oriented substrates (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 204-210 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Hg1−xCdxTe layers have been grown by organometallic vapor-phase epitaxy at 350 °C on {211}-oriented substrates, including CdTe, (CdZn)Te, and GaAs, with the emphasis on lattice matching for improved structural quality films. Characterization included optical microscopy, x-ray diffraction, Fourier transform infrared spectroscopy, and detailed field and temperature Hall measurements. The (211)B-oriented epilayers combine the structural quality of (100) including the absence of twinning with the flat topography of (111)B-oriented films. The crystal quality improved to that of the substrate with the closer lattice matching of (CdZn)Te, the mismatch taken up with lattice inclination on the high step density surface. A tighter control of the substrates' Zn content than exists at present is required for ultimate lattice matching to Hg0.2Cd0.8Te. As-grown Hg1−xCdxTe on (CdZn)Te (211)B substrates is p type with carrier levels in the 1–6 × 1016-cm−3 range for compositions greater than 0.20 and with no indication of mixed conduction behavior due to inversion layers or growth-related surface or interface layers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350743
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  • 2
    Electronic Resource
    Electronic Resource
    Fundamental stretching frequencies in 1H13C14N– –1H19F: J-dependent predissociative excited state lifetimes in ν3 (C≡N) stretching vibration (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 3980-3990 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Static gas phase rovibrational analyses have been used to determine the four fundamental stretching band origin frequencies (in cm−1) of 1H13C14N– – –1H19F: ν1=3716.100(3), ν2=3292.1029(3), ν3=2088.9209(7), ν4=167.407(5). Estimated lifetimes in the ν1 and ν3 vibrationally predissociating states are determined to be τ(ν1)=0.052(7) ns; and τ(ν3)=1.1(3) ns, J'≤16; τ(ν3)=0.32(5) ns, J'≥17. The availability of a higher HF rotational energy channel is proposed as a possible mechanism for explaining this sudden change in excited state lifetime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460805
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  • 3
    Electronic Resource
    Electronic Resource
    Inversion of experimental data and ab initio studies of a pseudo-atom–diatom model for the vibrational dynamics of HCN–HF (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 2209-2223 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Spectroscopic data was inverted to generate simplified atom–diatom intermolecular potentials for the hydrogen bonded dimer HCN–HF. Both the HF ν1=0 and ν1=1 adiabatic surfaces of this complex involving the hydrogen bond stretch (ν4) and the high frequency HF bend (ν6) degrees of freedom were considered. Adiabatic separation of angular and radial degrees of freedom allowed a modified vibrational Rydberg–Klein–Rees (RKR) inversion to give effective radial potentials for each bending state. The final potential at a sequence of intermolecular separations was obtained by requiring agreement between the eigenvalues of the angular Hamiltonian and the effective radial potentials which were obtained from the RKR inversion. Potentials obtained from the inversion procedure were tested by a variational calculation with a basis set that consisted of products of preoptimized radial and angular eigenfunctions. Transition frequencies included in the inversion procedure were reproduced to better than 1 cm−1, respective rotational constants were predicted within 0.15% of the experimental value and predicted intensities were in qualitative agreement with experimental results. Ab initio potentials were also calculated using second order Møller–Plesset perturbation theory to treat electron correlation effects and with a triple-zeta-valence basis set plus two sets of polarization functions. The energies were computed at geometries where the potential had been determined by the inversion procedure. A total of 264 geometries were considered. A correction for basis set superposition errors led to good agreement between ab initio and experimental values of the well depth. We calculated the bound states of the ab initio surfaces assuming the adiabatic separation of the ν1 mode from the ν4 and the ν6 modes. The transition frequencies calculated from the ab initio surface differed from the experimental energies by less than 20 cm−1 even for highly excited overtones. Both the potentials obtained from the inversion procedure and from the ab initio calculations were modified to predict the spectrum of HCN–DF.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463112
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  • 4
    Electronic Resource
    Electronic Resource
    Continuous-wave supersonic jet diode laser spectroscopy and dynamics of Ar–DCl: Rovibrational analysis of ν1 and ν1+ν12 and the effect of Coriolis coupling in the spectrum of ν1+2ν02 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 3175-3181 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ν1 fundamental and ν1+ν12 intermolecular combination bands of the van der Waals dimer Ar–DCl have been observed using a sensitive tunable diode laser continuous-wave (cw) supersonic jet spectrometer. The experimental results are compared with frequency and intensity predictions based on variational calculations using the H6(3) potential of Hutson. A possible assignment of the ν1+2ν02 combination band is proposed on the basis of anomalous intensity predictions from these calculations. The calculations indicate that the R branch of the ν1+2ν02 combination band is much stronger than the P branch due to a strong Coriolis mixing of the ν1+2ν02 and ν1+ν12 states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460874
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  • 5
    Electronic Resource
    Electronic Resource
    The accurate determination of spectroscopic constants for a dark vibrational state: The Coriolis coupled ν4 and ν6 bands of D11BF2 (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 4266-4278 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The high resolution infrared spectrum of deuterated difluoroborane, DBF2, has been recorded from 700 to 912 cm−1. At low resolution, the only observable bands in this region belong to the c-type, out-of-plane deuterium motion, ν4, of the two B isotopomers. Upon analysis of the ν4 fundamental in D11BF2, a large perturbation was observed due to a ΔK=±1 Coriolis interaction with a dark vibrational state. The dark state was presumed to be the unseen, a-type, in-plane D–B rocking fundamental, ν6. A novel method of upper state energy level interlacing was used to determine A, B+C and T0 for the dark excited state, 61, the band origin, rotational and centrifugal distortion constants for the 41 state, and ξ4,6b (≈2ζ4,6bB). Based upon these constants, ν6 transitions were predicted and located in the region of the perturbation. Experimentally determined Coriolis, rotational, and centrifugal distortion constants are reported. The experimental results are compared with the results from ab initio calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466080
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  • 6
    Electronic Resource
    Electronic Resource
    Spectroscopic characterization of the hydrogen bonded OC–HI in supersonic jets (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 1761-1767 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The hydrogen bond OC–HI has been characterized using high resolution microwave and infrared spectroscopies in supersonic seeded molecular jets. Ground state molecular parameters of the 16O12C–HI and 16O13C–HI isotopic species determined by the pulsed-nozzle Fourier transform microwave supersonic jet technique include: for 16O12C–HI, B0 (MHz)=900.9522(1), DJ (kHz)=2.519(1), CN (kHz)=0.94(18), χ(MHz)=−1346.238(13), χJ (kHz)=−8.27(31). The corresponding values for 16O13C–HI are 882.5997(2), 2.404(2), 0.87(19), −1349.481(17), and −7.76(28). This analysis is consistent only with a linear equilibrium dimer structure in which the proton is bound to the carbon atom of carbon monoxide. Other derived dimer parameters include: r(C–I)=4.271(2) A(ring), αav=24.8°, kσ(N m−1)=1.713. Infrared diode laser investigations provide a band origin frequency ν0 of 2148.549 040(29) cm−1 for the ν2 C≡O stretching fundamental vibration. This corresponds to a blue shift of 5.277 28(37) cm−1 relative to free monomer CO. Excited state molecular constants B2=898.2728(33) MHz. and DJ(2)=2.614(24) kHz are also determined. Line profiles are consistent with an excited state lifetime ≥0.54 ns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464264
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  • 7
    Electronic Resource
    Electronic Resource
    Pure rotational spectrum of Kr...HCl in the excited state (1000) observed with a glow-discharge source in a pulsed-nozzle Fourier-transform microwave spectrometer (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 2783-2789 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The pure rotational spectra of the four isotopomers 84Kr...H 35Cl, 84Kr...H 37Cl, 86Kr...H 35Cl, and 84Kr...D 35Cl of the van der Waals complex of krypton and hydrogen chloride have been observed in the vibrationally excited state (1000) by incorporating a pulsed glow-discharge source of excited-state molecules into a conventional pulsed-nozzle Fourier-transform microwave spectrometer. The rotational constant B1, the centrifugal distortion constant D1, and the Cl nuclear quadrupole coupling constant χ1(Cl) are reported for each isotopomer. The time of flight of the (1000) Kr...HCl molecules between the region of vibrational excitation and the detection region of the spectrometer indicates that the vibrational predissociative lifetime of the state (1000) is τ≥400 μs. Molecular properties of (1000) Kr...HCl determined from the observed spectroscopic constants are compared with those previously available for the ground state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465051
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  • 8
    Electronic Resource
    Electronic Resource
    A cw planar jet computer-controlled tunable IR diode laser spectrometer for the investigation of hydrogen-bonded complexes (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 21-26 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An ultrasensitive computer-controlled tunable infrared diode laser cw planar supersonic jet spectrometer for second derivative detection of hydrogen-bonded complexes is described. Spectroscopic analyses of transitions in carbon monoxide monomer permit detection limits to be set at 2.9×106 molecules/cm3/quantum state. Simultaneously recorded spectra of the ν2C≡O stretching vibrations in OC—HCl and OC—HBr are presented to illustrate the performance of this supersonic jet spectrometer for investigating weakly bound hydrogen-bonded dimers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142310
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  • 9
    Electronic Resource
    Electronic Resource
    Rovibrationally resolved, Fourier-transform near infrared spectroscopy of the ν1 and ν2 vibrations of the HCl dimer in a supersonic jet (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 4593-4598 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have recorded the high-resolution (0.007 cm−1) Fourier-transform near infrared absorption spectrum of the symmetric 35Cl–35Cl, and the mixed 35Cl–37Cl isotopomers of the hydrogen chloride dimer in a supersonic jet. The spectrum was recorded under a low effective rotational temperature (≈20 K). Rovibrational analysis of the observed spectra has been performed for the K‘a=0 subbands of the ν+1 and ν−1 perpendicular-type bands centered at 2890 and 2879 cm−1, respectively. The K‘a=0 and 1 parallel-type subbands of the ν−2 at 2839 cm−1 and ν+2 at 2857 cm−1 have also been analyzed. Furthermore, we have observed and investigated the (H 35Cl)2ν+1, K‘a=1, ΔK=−1 rovibrational transition centered near 2869 cm−1. The results are compared with spectra previously recorded using difference frequency tunable laser spectrometers both in a supersonic slit jet and in an equilibrium gas phase mixture to demonstrate the advantages and limitations of the FTIR technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467446
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  • 10
    Electronic Resource
    Electronic Resource
    Investigation of the ground vibrational state structure of H35Cl trimer based on the resolved K, J substructure of the ν5 vibrational band (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 7101-7108 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The high resolution rovibrational IR spectrum of the antisymmetric H35Cl stretching ν5 vibrational band in the (H35Cl)3 isotopomer of the trimer has been measured with a tunable infrared diode laser supersonic jet spectrometer. One of the most prominent features of the spectrum is a series of strong lines each formed with pP or rR transitions, with resolved K, J substructure developing between two adjacent pP or rR heads. Analyzing the spectrum of (H35Cl)3 as the perpendicular band of an oblate symmetric rovibrator, the following molecular parameters have been obtained: ν0−C'ζ=2809.776 98(6) cm−1, B‘=6.804 14(55)×10−2 cm−1, B'=6.859 43(55) ×10−2 cm−1, C'–C‘=2.737(78)×10−4 cm−1, DJK‘=−8.40(38)×10−7 cm−1, DJK'=−8.14(38)×10−7 cm−1, DJ‘=4.26(16)×10−7 cm−1, DJ'=4.16(16)×10−7 cm−1, DK‘=4.32(22)×10−7 cm−1, DK'=4.16(22)×10−7 cm−1. A relationship among the centrifugal distortion constants establishes that the geometry of (H35Cl)3 is consistent with a dynamically averaged planar ground vibrational state. The centers of mass of the H35Cl components are separated by 3.693(1) A(ring) in this structure. Ab initio methods were also used to estimate the splitting due to the tunneling motions between clockwise (cw) and counterclockwise (ccw) identical structures. Both theoretical and experimental evidence indicate that the (HCl)3 complex has a planar equilibrium structure with no observable tunneling probability between the cw and ccw forms, thus the molecular symmetry group of the complex is proposed to be C3h(M).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466909
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