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  • American Institute of Physics (AIP)  (4,672)
  • 1985-1989  (4,672)
  • 1
    Electronic Resource
    Electronic Resource
    Vibrational spectra of methylthiirane (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1140-1146 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrational Raman, infrared absorption, and infrared circular dichroism (VCD) spectra were measured for methylthiirane. Ab inito vibrational frequencies were calculated with a 6-31G basis, and vibrational assignments were suggested by comparing the experimental and theoretical data. These assignments were used for the interpretation of the experimental VCD spectrum of (R)-methylthiirane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452257
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  • 2
    Electronic Resource
    Electronic Resource
    rf-induction plasma apparatus for generating submicron particles of metals (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1328-1333 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A unique apparatus is described for generating submicron particles of metals over a narrow-size distribution range. Coarse particles of the metal were injected into the tail flame of an argon rf-induction plasma torch, where they were vaporized. The vapor was gas quenched, producing a metallic smoke of fine spheroidal particles. The system collection units separated the fine particles (∼0.3-μm diameter) from the heavier particles (≥1-μm diameter) while the material was finely dispersed and moving in the gas stream.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140986
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  • 3
    Electronic Resource
    Electronic Resource
    Properties and characterization of codeposited boron nitride and carbon materials (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 5109-5118 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The physical properties of carbon-boron nitride (C-BN) prepared from mixtures of BCl3, NH3, and selected hydrocarbons by codeposition methods have been investigated using x-ray diffraction, electron diffraction, transmission electron spectroscopy, x-ray photoelectron spectroscopy, Raman scattering, optical reflectivity, thermal conductivity, thermopower, and electrical resistivity. Taken collectively, the results of these experiments indicate that the compression-annealed C-BN materials studied here consist of separated domains of pyrolytic boronated graphite and pyrolytic boron nitride, while as-deposited samples may possibly be a single-phase mixture of C, B, and N. As-deposited materials containing more than 20% carbon were found to be more highly oriented than unannealed pyrolytic graphite, and the crystallinity of these materials was greatly enhanced by uniaxial compression annealing. Results of the thermal conductivity, thermopower, and electrical resistivity measurements are consistent with a network of turbostratic graphite BN domains with some conduction paths for charge carrier transport between the domains. Increasing the carbon concentration from 20% to 60% leads to an increased linkage between the conducting domains and a percolation conducting network is established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343188
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  • 4
    Electronic Resource
    Electronic Resource
    Study of field-driven wall-configuration conversions for laminated Permalloy in the easy-axis state (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4036-4038 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Laminated Permalloy, with edge-curling walls replacing closure domains, has been proposed to increase permeability and reduce wall noise in recording. However, in structures meeting the criteria for Slonczewski's "easy-axis'' state, normal walls often coexist with edge-curling walls. We have used our laser magneto-optic microscope to study inductive-head-yoke shaped elements of two and four Permalloy layers separated by nonmagnetic, metallic spacers. In the four-magnetic-layer sample a state with a single wall, terminating at the edge-curling regions and lying along the easy-axis direction, is often observed on the top and bottom layers. Some elements may be driven into an easy-axis state with no observed domain walls. The two-magnetic-layer sample also exhibited simultaneous one-wall structures on the top and bottom layers. The other stable configuration was a no-wall state on the top layer and a two-wall (three-domain) state on the lower layer. These "coupled'' states were exceptionally stable in both samples; fields on the order of 300 Oe were required to switch between configurations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340541
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  • 5
    Electronic Resource
    Electronic Resource
    Laser performance of LiSrAlF6:Cr3+ (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 1051-1056 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have lased the new material, LiSrAlF6:Cr3+ (Cr3+:LiSAF). The single crystals were grown by the horizontal zone melting technique. The spectroscopic properties of Cr3+:LiSAF are similar to those of other low-field Cr3+-doped systems, although the emission cross section is strongly π polarized and is also somewhat larger than has been measured for other fluoride hosts. The free-running lasing wavelength of Cr3+:LiSAF is 825 nm, and the tuning range extends from at least 780 to 920 nm. Using Kr laser pumping, we obtained slope efficiencies of 36% and 14% by utilizing output couplings of 4.8% and 0.8%, respectively. On the basis of these results, the extrapolated maximum efficiency of 53% is determined, to be compared to the quantum defect-limited value of 78%. It is concluded that a moderate level of excited state absorption (ESA) loss is responsible for the reduced efficiency of the Cr3+:LiSAF system. This contrasts with the related results previously obtained for LiCaAlF6:Cr3+, where it was concluded that the effects of ESA were negligible [IEEE J. Quantum Electron. QE-24, 2243 (1988)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343491
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  • 6
    Electronic Resource
    Electronic Resource
    The spectrum of highly ionized praseodymium and dysprosium from the Texas tokamak plasma in the 50–250-A(ring) range (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 3644-3649 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spectra of highly ionized praseodymium and dysprosium recorded from the Texas tokamak (TEXT) plasma have been analyzed in the 50–250-A(ring) range. The spectra contain high-intensity continuum bands in the region below 100 A(ring) and bright individual lines above this wavelength. Lines of highly ionized praseodymium and dysprosium have been identified. The highest ionization state reached in the 1-keV central electron temperature tokamak plasma was Cu i-like Pr xxxi. The composition of the bands is explained in terms of a new theoretical approach developed to treat large unresolved transition arrays. The brightness of the continuum is compared with that of intense spectral lines emitted in the same wavelength range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336744
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  • 7
    Electronic Resource
    Electronic Resource
    Electronic states of semiconductor clusters: Homogeneous and inhomogeneous broadening of the optical spectrum (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 4001-4011 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The homogeneous (single-cluster) and inhomogeneous contributions to the low temperature electronic absorption spectrum of 35–50 A(ring) diameter CdSe clusters are separated using transient photophysical hole burning. The clusters have the cubic bulk crystal structure, but their electronic states are strongly quantum confined. The inhomogeneous broadening of these features arises because the spectrum depends upon cluster size and shape, and the samples contain similar, but not identical, clusters. The homogeneous spectrum, which consists of a peak 140 cm−1 (17 meV) wide, with a phonon sideband and continuum absorption to higher energy, is compared to a simple molecular orbital model. Electron–vibration coupling, which is enhanced in small clusters, contributes to the substantial broadening of the homogeneous spectrum. The inhomogeneous width of the lowest allowed optical transition was found to be 940 cm−1, or seven times the homogeneous width, in the most monodisperse sample.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454833
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  • 8
    Electronic Resource
    Electronic Resource
    Excited state absorption of Sm2+ in SrF2 and SrCl2 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6751-6756 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The excited state absorption spectrum of Sm2+ diluted as an impurity in the single crystal hosts SrF2 and SrCl2 has been observed. The absorption peaks associated with the 5D0(4f6) excited state were found to be displaced by approximately 3000 cm−1 from the absorption bands arising from the 7F0(4f6) ground state when the 5D0–7F0 energy was taken into account. The observed peak separation is ascribed to the 4f–5d exchange interaction. From the measured peak positions and band intensities, the exchange energy for the Sm2+ impurity in the two host crystals was determined to be about the same order of magnitude as that expected for the free ion. The implications of the properties of the excited state absorption bands for the performance of CaF2:Sm2+ and SrF2:Sm2+ lasers are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454420
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  • 9
    Electronic Resource
    Electronic Resource
    The ideally polarizable interface: Integral equations (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 892-898 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The integral equations used in the microscopic theory of the electric double layer are extended to the case of an impermeable interface separating two conducting media (ionic solutions or plasma). This system is a model for an ideally polarizable interface. Exact relations are given for the contact values of the one particle density function, and also for the pair correlation functions. We solve numerically the Poisson–Boltzmann (PB), the hypernetted chain (HNC), and mean spherical (MSA) approximations, and compare the results to the exact solution of the one component plasma in two dimensions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449504
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  • 10
    Electronic Resource
    Electronic Resource
    Rotation-induced vibrational mixing in X˜ 1A1 formaldehyde: Non−negligible dynamical consequences of rotation (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 1688-1701 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Individual rotation-vibration levels of the formaldehyde X˜ 1A1 state with 7400〈Evib〈8600 cm−1 have been examined by the stimulated emission pumping (SEP) technique. At low values of the rotational quantum number (J≤3), the SEP spectra were simple. The only vibrational levels which appeared in the spectra were those expected either to have large Franck–Condon overlap with the A˜ 41 level or to have appreciable Fermi resonance with a nearby Franck–Condon allowed level. At higher J and Ka values, the spectra rapidly became more complex and the observed level densities at J≈10, Ka≈2 were several times larger than the known total density of vibrational levels. This increase in the density of spectrally accessible vibrational levels was a result of rotation-induced mixing of the anharmonic vibrational basis functions (Coriolis coupling) which compromised the "goodness'' of both vibrational and Ka quantum numbers. Coriolis matrix elements computed in a harmonic normal mode basis set qualitatively confirmed the importance of rotation-vibration mixing. The failure to obtain quantitative agreement is attributed to anharmonic effects. The rotation-dependent vibrational mixing effects observed in the SEP spectra indicate the importance of rotation in intramolecular vibrational dynamics and mode-selective vibrational excitation. Rotation significantly diminishes the structural differences (manifest in Franck–Condon factors, rotational constants, electric dipole moments) between rotationless vibrational levels and promotes an averaging of the character of near degenerate vibrational levels together with a partial destruction of the Ka rotational quantum number. This means that the onset of the quasicontinuum in infrared multiphoton dissociation and the inhomogeneous widths of high overtone bands would be very different for excitation out of a single low vs high J level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448401
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