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  • 1
    Electronic Resource
    Electronic Resource
    Oxygen doping in close-spaced-sublimed CdTe thin films for photovoltaic cells (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 3607-3609 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Efficient CdTe/CdS thin film solar cells have been the recent focus, in which the CdTe layers were reported by close-spaced sublimation, and oxygen was used to control the p-type conductivity of the deposited films. Both the fundamental gap and the impurity level were determined by the wavelength modulation reflectance spectroscopy, which demonstrates that while oxygen atoms have an ionization energy of about 0.1 eV, they do not behave as a simple shallow acceptor. This finding is supported by the electrical characterization. The oxygen concentration incorporated in the CdTe thin films were found to be in the range of 1019–1020 cm−3 by the IR measurements, while a carrier concentration between 1010 and 1012 cm−3 was obtained by Hall measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336792
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  • 2
    Electronic Resource
    Electronic Resource
    Rotational analysis of A˜ 2A1↔X˜ 2E electronic transition of the jet-cooled methylthio radical (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 6852-6857 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A set of molecular parameters describing both the X˜ and A˜ states of CH3S, has been obtained by a joint fitting of the rotationally resolved electronic transitions observed in a free-jet-cooled laser-induced fluorescence study of CH3S and an earlier microwave study of its X˜ state. The present work shows that because of incomplete information, nearly all of the previously reported molecular parameters for CH3S must be significantly revised. The present observations show an unusual electronic structure for the radical, characterized by a short C–S bond distance and peculiar methyl group geometry in the ground state. The C–S bond is observed to lengthen markedly in the excited A˜ state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456258
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  • 3
    Electronic Resource
    Electronic Resource
    The rotational energy accommodation of NO formed in the catalytic oxidation of NH3 over Pt(111) (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 2861-2865 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rotational energy distributions of the desorbing NO product from the NH3+O2 reaction on a Pt(111) single crystal have been measured using the laser-induced fluorescence technique in conjunction with an UHV apparatus. Over the surface temperature range 800–1300 K, the rotational temperature of NO was found to remain virtually constant near 400 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454990
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  • 4
    Electronic Resource
    Electronic Resource
    Nonperturbative theory of temperature-dependent optical dephasing in crystals. IV. Microscopic model for pseudolocal phonons (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 54-59 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We continue our study of the optical dephasing of impurities by phonons. The pure dephasing contribution to the homogeneous linewidth is calculated to all orders in the excitation–phonon interaction. We introduce a microscopic model for the pseudolocal phonon spectral density when the impurity is in the ground electronic state. This microscopic model improves upon our previous phenomenological model. The model is applied to several experimental systems—in all cases, the theoretical results provide a reasonably accurate description of the temperature-dependent linewidth with no adjustable parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453603
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  • 5
    Electronic Resource
    Electronic Resource
    Laser-induced emission of CH3O in solid argon (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 81-86 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The A 2A1−X 2E fluorescence of CH3O in solid Ar in the wavelength range 310–420 nm has been studied either by simultaneous laser photolysis and excitation of CH3ONO in the Ar matrix or by laser excitation of the products deposited from the reactions of microwave-discharged CF4 with CH3OH diluted by Ar. The spectrum showed an extensive progression in C–O stretching (ν3). The zero-phonon lines of 12CH3O and 13CH3O yielded unambiguous vibrational assignments with ν00=31 291, ω‘e=1051, and ω‘ex‘e=6.5 cm−1 for 12CH3O. Observation of several weak combination bands also yielded ν‘2=1356, ν‘4=2758, and ν‘5=1406 cm−1. The laser excitation spectra in the 273–322 nm region also exhibited an intense progression in C–O stretching with ω'e=657 and ω'ex'e=4.4 cm−1 for 12CH3O. Additional wave numbers ν'2=1308 and ν'5=1410 cm−1 were also obtained from the combination bands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456471
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  • 6
    Electronic Resource
    Electronic Resource
    A comparison of rotational energy accommodation in catalytically produced OD and OH radicals desorbing from a smooth Pt(111) single crystal (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 432-440 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rotational energy distributions of OD and OH radical reaction products desorbing from a smooth Pt(111) single crystal surface have been measured under closely similar experimental conditions by using the laser-induced fluorescence technique in conjunction with an UHV apparatus. Over the temperature ranges studied, nearly full rotational energy accommodation was observed for OD with a rotational to surface temperature ratio, Tr/Ts =0.96±0.04, and a somewhat lower ratio of 0.86±0.05 was obtained for OH. For both OD and OH the spin–orbit temperatures were the same as the rotational temperatures and no preference for any lambda-doublet state was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454620
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  • 7
    Electronic Resource
    Electronic Resource
    Spectroscopic characterization of mesogen order in discotic liquid crystal (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 5950-5955 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Infrared and Raman spectra of the discotic liquid crystal molecules benzene–hexa-hexanoate (BH6), benzene–hexa-heptanoate (BH7), benzene–hexa-octanoate (BH8), and benzene–hexa-nananoate (BH9), and of mixtures of BH7 with BH8, are reported as a function of temperature. The 1615 cm−1 infrared band is strong in the Raman spectrum of BH7 and is taken as a characteristic of and diagnostic for central core disorder in all these molecules and mixtures. The aliphatic side chains are shown to disorder at much lower temperatures than the central core, and order in the central core is shown to remain throughout the liquid crystalline region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455546
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  • 8
    Electronic Resource
    Electronic Resource
    Study of the transit time of pressure propagation in an acoustic delay line (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 3063-3065 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A fast sensor was used as a vacuum gauge to measure the transit time of a gas pressure through an acoustic delay line (ADL). The results were compared with the predictions of two theoretical models. We found that in the rupture pressure range of 101 to 104 Pa, the predictions of Jean and Rauss' model, based on the assumption that the flow of gas be a gas fluid, set lower boundaries for the observed transit times; while the predictions of our model, based on the molecular motion, set the upper ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138992
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  • 9
    Electronic Resource
    Electronic Resource
    Apparatus and technique for reconstruction of flaws using model-based elastic wave inverse ultrasonic scattering (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 3089-3098 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An automated multiviewing ultrasonic apparatus and signal processing routine have been developed for utilization in nondestructive evaluation (NDE) of materials. The instrument has been developed to take advantage of recent advances in long and intermediate wavelength inverse scattering of elastic waves, and provides a 3-D reconstruction of a flaw. Although the reconstruction obtained does not contain fine details of the flaw's structure, it provides sufficient information about the flaw (size, orientation, and selected materials properties) so that failure-predictive decisions can be made.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139211
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  • 10
    Electronic Resource
    Electronic Resource
    Nonperturbative theory of temperature-dependent optical dephasing in crystals. II. Pseudolocal phonons (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 2097-2106 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We continue our discussion of the nonperturbative theory of zero-phonon impurity lines in crystals formulated by Osad'ko and more recently by us. In Paper I of this series we evaluated our general results for the linewidth and shift for models of electronic coupling to both acoustic and optical phonons. Here we evaluate our general results for a simple model of electronic coupling to a pseudolocal phonon. The pseudolocal phonon is characterized by its frequency and lifetime in both the ground and excited electronic states. In addition to providing exact analytic expressions (reduced to quadrature) for the width and shift, we derive an approximate analytic expression for the linewidth that is bi-Arrhenius, with activation energies corresponding to the ground and excited state pseudolocal phonon frequencies. We discuss how our theoretical approach and results are related to the exchange theory of Harris, the optical Redfield theory of deBree and Wiersma, and the perturbation theory of Small and Jones and Zewail. In Paper III of this series, we compare the results of this paper and of Paper I to experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449352
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