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  • American Institute of Physics (AIP)  (8)
  • American Association for the Advancement of Science  (4)
  • 1995-1999  (12)
  • 1
    Electronic Resource
    Electronic Resource
    Thermal stress in a trigonal crystal rod (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 3159-3167 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The thermally induced stresses and strains in a freely supported long trigonal crystal rectangular rod are presented. Careful grouping of the stress, strain relationships casts the equations into the form of the usual logarithmic potential solution with new coefficients that are simple functions of the stiffness matrix elements. Then a logarithmic potential solution is used to find analytic expressions for the particular stresses. Addition of two ordinary isothermal stress fields allows the particular stresses to be corrected so that (a) the surface stresses average to zero on each lateral boundary and (b) the plane strain condition is removed and the average longitudinal stress and its moments are zero. A method to zero the residual surface stress is mentioned and numerical test cases and an example are given. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369655
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  • 2
    Electronic Resource
    Electronic Resource
    Addendum: "Optical distortion and birefringence in a heated trigonal crystal rod" [J. Appl. Phys. 85, 7037 (1999)] (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 5318-5318 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371434
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal stress in a trigonal crystal rod: Second corrected solution (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 3605-3608 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The surface thermal stresses from an earlier article for a rectangular trigonal crystal rod with zero average stress on each lateral surface are developed into Fourier series and ordinary (T=0) stress solutions are added to attempt to zero the remaining surface stress. To first zero the surface tensile stress, these stresses are developed as sine series so the shear stresses must be developed as cosine series. This leads to stress "swapping" between surfaces as a residual shear stress remains. Another computer code like the one developed for the earlier article has been generated to add these correcting stresses to the original stresses. For a chosen symmetric temperature distribution, iteration of a process to correct the stresses has converged to nearly zero remaining stress on the lateral surfaces. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371266
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  • 4
    Electronic Resource
    Electronic Resource
    Novel high-power and coherent semiconductor laser with a shaped unstable resonator (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 2048-2050 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe a novel high power semiconductor laser that employs a shaped unstable resonator waveguide to maintain fundamental spatial mode operation at high power levels. We call this device the SHUR (shaped unstable resonator) laser. By photoetching and regrowth we locate a secondary, nonplanar antiguide, beneath the main part of the waveguide. The lasing mode couples to this secondary guide and experiences lateral antiguiding, which is the basis of the unstable resonator action. Prototype versions of the SHUR laser show a maximum pulsed output power of 770 mW per facet. The focused beam is dominated by a single lobe that contains 47% of the output power. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113688
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  • 5
    Electronic Resource
    Electronic Resource
    Pressure dependence and metastable state formation in the photolysis of dichlorine monoxide (Cl2O) (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 2857-2868 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation of dichlorine monoxide (Cl2O) was studied using broadband flash photolysis to investigate the influence of variations in the photolysis wavelength domain, bath gas pressure and bath gas identity on the yield and temporal dependence of the ClO product. ClO yields were independent of bath gas pressure when the photolysis spectral band extended to 200 nm (quartz cutoff) but for photolysis restricted to wavelengths longer than about 250 nm, ClO yields decreased with increasing bath gas pressure and there was a pressure-dependent delay in the formation of ClO. Under these conditions, a weak, highly structured absorption spectrum was observed in the range 16 600–26 000 cm−1 with a lifetime on the order of 500 ms. A portion of the spectrum could be analyzed (22 000–26 000 cm−1) which showed progressions having differences of 283, 443, and 505 cm−1. Ab initio calculations were performed to evaluate vertical excitation energies and oscillator strengths from the lowest-energy singlet (X 1A1) or triplet (1 3B1) states to various excited states. The calculations indicated that the 2 3A2←1 3B1 transition has an unusually large oscillator strength. The transition energy, 3.05 eV, is consistent with the observed metastable spectrum. The observed pressure dependence of ClO formation could be modeled using a mechanism which assumed that Cl2O excitation at wavelengths longer than about 300 nm leads to rapid intersystem crossing to two metastable states in the triplet manifold. These states undergo competitive dissociation to ClO+Cl and collisional relaxation to the ground state. The dynamics of Cl2O may serve as a model for other molecules of importance in the earth's lower stratosphere such as ClONO2 where filtering of the solar spectrum by ozone restricts photolysis to the weak tail of the absorption continuum. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471109
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  • 6
    Electronic Resource
    Electronic Resource
    The rotational spectrum and molecular properties of bromine dioxide, OBrO (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 8292-8302 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The rotational spectrum of the OBrO radical has been observed in the gas phase over the solid products of the O+Br2 reaction. Spectra have been measured for both O79BrO and O81BrO in their (000), (010), and (020) vibrational states in selected regions between 88 and 627 GHz spanning the quantum numbers 1≤N≤61 and 0≤Ka≤14. The spectra are well described by a Hamiltonian which includes centrifugal distortion effects for fine and hyperfine terms. The molecular structure, the dipole moment, and the harmonic force field have been derived, and they, as well as fine and hyperfine structure constants, are compared with data of related molecules and electron spin resonance data from OBrO isolated in cryogenic salt matrices. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475030
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  • 7
    Electronic Resource
    Electronic Resource
    Optical distortion and birefringence in a heated trigonal crystal rod (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 7037-7042 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Analytic expressions for the optical distortion and the fractional polarization purity loss when a perfectly plane, perfectly linearly polarized moderate power laser beam traverses a heated, rectangular trigonal class 3m, 32, or 3¯m crystal rod are given. The expressions are in terms of the crystal physical parameters of the rod, as well as the local stresses and strains that are developed in the rod by heating from the beam. When the crystal temperature variation is symmetric in the rod's transverse coordinates, these expressions become analytic in the temperature variation and two simple temperature integrals. An example with a symmetric temperature variation in a lithium niobate crystal is given. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370509
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  • 8
    Electronic Resource
    Electronic Resource
    The OBrO C(2A2)←X(2B1) absorption spectrum (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 2300-2307 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The highly structured visible absorption spectrum of the bromine dioxide radical, OBrO, has been observed in the 15 500–26 000 cm−1 region. The spectrum is dominated by a long progression in the Br–O symmetric stretching motion (ν1′) and a series of short progressions built on the bending mode (ν2′); there are no features associated with the excitation of the antisymmetric stretching mode (ν3′). The spectrum also contains numerous transitions originating from the (0,1,0) and (1,0,0) vibrational levels of the electronic ground state, X(2B1). A simultaneous fit to all of the observed vibronic features yielded the frequencies ν1″=799.4 cm−1, ν2″=317.5 cm−1, ω1′=641.5 cm−1, ω2′=210.7 cm−1, and a band origin T0=15 863 cm−1. Franck–Condon simulations combined with ab initio calculations of the four lowest OBrO doublet electronic states identify the spectrum as arising from the C(2A2)←X(2B1) electronic transition. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474606
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  • 9
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    Isotopic Fractionation of Stratospheric Nitrous Oxide (1997)
    American Association for the Advancement of Science
    Details
    Publication Date: 1997-12-05
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science
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  • 10
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    Structure of the VHL-ElonginC-ElonginB Complex: Implications for VHL Tumor Suppressor Function (1999)
    American Association for the Advancement of Science
    Details
    Publication Date: 1999-04-16
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science
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