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  • Articles  (58)
  • American Chemical Society  (34)
  • American Institute of Physics (AIP)  (12)
  • Wiley  (12)
  • 1985-1989  (58)
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  • Articles  (58)
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  • 1
    Electronic Resource
    Electronic Resource
    Photophysical probes of intramolecular interactions responsible for asymmetric induction (1985)
    s.l. : American Chemical Society
    The @journal of organic chemistry 50 (1985), S. 5499-5503 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00350a012
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  • 2
    Electronic Resource
    Electronic Resource
    .beta.-Adrenoceptor activity of the stereoisomers of the bufuralol alcohol and ketone metabolites (1985)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 28 (1985), S. 1648-1651 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00149a018
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  • 3
    Electronic Resource
    Electronic Resource
    Ab initio analytic polarizability, first and second hyperpolarizabilities of large conjugated organic molecules: Applications to polyenes C4H6 to C22H24 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 385-395 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The static dipole polarizability and second hyperpolarizability tensors are calculated for polyene systems via ab initio coupled-perturbed Hartree–Fock theory. The effect of basis set augmentation on the calculated properties is explored for C4H6 and example basis sets are used to calculate the polarizability and second hyperpolarizability for the longer polyenes: C6H8, C8H10, C10H12, C12H14, C14H16,C16H18, C18H20, C20H22, C22H24. Results for the finite polyenes are extrapolated to predict the unit-cell polarizability and second hyperpolarizability of infinite polyacetylene. The working equations which take advantage of the 2n+1 theorem of perturbation theory for calculating up to the second hyperpolarizability are given, and their implementation is briefly discussed. In particular it is shown that the implementation is readily amenable to parallel processing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455480
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement and prediction of Raman Q-branch line self-broadening coefficients for CO from 400 to 1500 K (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 4059-4068 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The J and temperature dependence of the self-broadening coefficients for the Raman Q-branch lines of pure CO have been experimentally determined for Q(J) transitions with J=0–38 and for temperatures in the range 400–1500 K. It is shown that a fitting law, based on a modified exponential energy-gap model for the rates of state-to-state rotationally inelastic collisions, can account for the observed J dependence. The two parameters that determine the J dependence are found to be essentially independent of temperature. A temperature scaling function, recently proposed for N2, is added to the basic rate law, and accurate predictions of both the J and the T dependence of these coefficients and those previously reported at 298 K are obtained. This rate law model, used in conjunction with a relaxation matrix description of the Q-branch spectrum, is shown to give good agreement with the observed, partially collapsed spectrum at 2.8 atm and 295 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455764
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  • 5
    Electronic Resource
    Electronic Resource
    Broadening and shifting of the Raman Q branch of HD (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2115-2124 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The line broadening and shifting of the vibrational Q branch in pure HD has been measured for transitions J=0 to 3 at room temperature over the density range 0.8 to 10.6 amagat. The shifting and broadening coefficients have been determined with an uncertainty of ±0.2×10−3 cm−1 /amagat, which now provides a discriminating test for various semiclassical and quantal theoretical calculations. The line broadening coefficients are compared with linewidth data from other spectroscopic branches and with measurements of the rates of state-to-state rotational energy transfer. Use of an exponential gap law for the rates of rotational energy transfer allows estimates to be made of the contributions to the linewidths from rotationally inelastic, elastic vibrational dephasing, and elastic reorientation processes. This analysis suggests that rotational energy transfer occurs approximately 30% faster in v=1 than in v=0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456005
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  • 6
    Electronic Resource
    Electronic Resource
    Three interacting particles in one dimension: An algebraic approach (1988)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 29 (1988), S. 155-168 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: An algebraic formulation of the problem of three particles in one dimension is given, where the particles interact with delta function potentials of arbitrary strength and have almost arbitrary mass. An algebraic formulation is taken to mean that the steps implied from formulation to solution involve finite algebra. The canonical example is equal mass particles interacting with equal strength delta function potentials, where the Bethe ansatz holds and the solution involves only sums of products of matrices with elements that are rational functions of a complex variable. When the Bethe ansatz fails the Sommerfeld diffraction ansatz is satisfied if a condition of internal consistency is met. This condition of internal consistency requires the solution to a Riemann–Hilbert functional equation with an algebraic coefficient. The solution to this functional equation is an analytic, but not generally a meromorphic function. It is demonstrated that an asymptotic solution may be constructed within the domain of algebraic functions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.528168
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  • 7
    Electronic Resource
    Electronic Resource
    Algebraic structures of degenerate systems and the indefinite metric (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 559-572 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: It is shown that the indefinite metric structures of degenerate systems as given by Strocchi and Wightman [F. Strocchi and A. S. Wightman, J. Math. Phys. 15, 2198 (1974); 17, 1930 (1976)] arise in a natural fashion from the algebraic structure of such systems, where the latter has been developed in a C*-context by Grundling and Hurst [H. B. G. S Grundling and C. A. Hurst, Commun. Math. Phys. 98, 369 (1985)]. Auxiliary concepts like gauge equivalence are examined, and the preceding general theory is specialized to the situation of linear boson fields with linear Hermitian constraints. Two examples of this situation are given—a one-dimensional scalar boson in a periodic universe and Landau gauge electromagnetism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527641
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  • 8
    Electronic Resource
    Electronic Resource
    General mechanism for the bacterial toxicity of hypochlorous acid: abolition of ATP production (1989)
    s.l. : American Chemical Society
    Biochemistry 28 (1989), S. 9172-9178 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00449a032
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  • 9
    Electronic Resource
    Electronic Resource
    Laser-assisted chemical etching of copper (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 78-80 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Copper films several microns thick can be rapidly etched (0.1–0.5 μm/s) in a chlorine atmosphere using 308 nm pulsed excimer laser radiation. Etch rates exhibit a practical threshold of ∼0.1 J/cm2 and saturate above 0.3 J/cm2. The etching mechanism involves reaction of copper and chlorine in the time between the laser pulses to form a nonstoichiometric chloride which is thermally ablated by the laser. Photochemical effects appear to be unimportant. The etch rate increases roughly as the square root of the laser pulse rate, suggesting that reactive diffusion is a limiting factor. As the substrate temperature increases, the etch rate rises, then falls, indicating the competition of processes such as adsorption, desorption, and reaction of chlorine molecules on copper chloride surfaces. A simple model based on chemical kinetics suggests that the copper-chlorine reaction at pressures above 0.1 Torr is controlled by a physisorbed intermediate state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100128
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  • 10
    Electronic Resource
    Electronic Resource
    Photoacoustic studies of excimer laser induced ablation of polymethylmethacrylate (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 287-290 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The ablation of polymethylmethacrylate (PMMA) at both 248 and 193 nm has been studied using photoacoustic techniques. The acoustic responses of PMMA during the ablation process are resolved into a bipolar, thermal component, and a unipolar, ablative component. This latter component is correlated to the center-of-mass velocity of the ablated material. Fluence-dependent studies show that the fragment center-of-mass velocity increases with increasing fluence even after the etch rate has reached saturation. In addition, results are presented suggesting that an increase in the absorption of the laser radiation by the fragments occurs at fluences above ∼4 J/cm2 causing a change in the profile of the ablated area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341424
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