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  • 1
    Electronic Resource
    Electronic Resource
    The heat capacity and derived thermophysical properties of the high TC superconductor YBa2Cu3O7−δ from 5.3 to 350 K (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 6794-6799 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The heat capacity of the perovskite high-TC superconductor YBa2Cu3O7−δ was measured from 5.3 to 350 K in an adiabatic calorimetric cryostat. A break in the heat-capacity curve, associated with the critical temperature for superconductivity was observed between 90.09 and 92.59 K. The transition temperature was identified as 91.44 K, and ΔCp,m was calculated to be 0.559R at that temperature. The lattice heat capacity was evaluated by means of the recently developed Komada/Westrum phonon distribution model and the apparent characteristic temperature aitch-thetaKW was calculated to be 107.7 K. The excess electronic heat capacity for the superconducting phase was evaluated and the energy gap was identified as 234. R K. Excess contribution, resulting from magnetic impurities, was noted below 20 K. Thermodynamic properties at selected temperatures are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458266
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  • 2
    Electronic Resource
    Electronic Resource
    Nuclear spin relaxation in NH4ClO4 and ND4ClO4 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1203-1204 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Spin–lattice relaxation times for chlorine and deuterium isotopes in NH4ClO4 and ND4ClO4 have been measured over the temperature range 153 to 295 K. No evidence in support of the hypothesis that there is a phase transition near 180 K has been found in the results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455235
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  • 3
    Electronic Resource
    Electronic Resource
    Specific heat of a high-Tc perovskite superconductor YBa2Cu3O8−δ (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5040-5041 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Specific heat measuremnts on high transition temperature perovskite superconductor were conducted from 5.3 K to 345 K. The sample was prepared by mixing stoichiometric amounts of Yttrium oxide, BaO, and CuO so as to yield a 1:2:3 ratio of metals. T he decrease in specific heat at the transition temperature - 91 K is discussed.(AIP)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452821
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  • 4
    Electronic Resource
    Electronic Resource
    The thermodynamics of perchlorates. I. Heat capacity of ND4ClO4 from 7 to 345 K and the analysis of heat capacities and related data of NH4ClO4 and ND4ClO4 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 399-407 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The heat capacity of the orthorhombic salt: deuterated ammonium perchlorate, ND4 ClO4 , was measured from 7 to 345 K using adiabatic calorimetry. The heat capacity against temperature curve is smooth, continuous and without anomaly. Values of the standard molar thermodynamic quantities are presented up to 340 K. The heat capacities of ND4 ClO4 and NH4 ClO4 have been analyzed. The contributions to the vibrational heat capacity from the external optical modes of NH+4 or ND+4, ClO−4 and libration from the external modes of ClO−4 along with those of vibration from the internal optical modes of NH+4 or ND+4 and ClO−4, and the acoustic lattice modes for these ions have been calculated. The difference between the experimental and calculated heat capacity, called the residual heat capacity, equals the contribution from ammonium ion rotation and the thermal expansion of the lattice. With recent thermal expansion data, the correction from constant stress to constant strain has been applied and the derived rotational heat capacities of the NH+4 and ND+4 are determined to be in qualitative agreement with those derived from various rotational models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457474
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  • 5
    Electronic Resource
    Electronic Resource
    Erratum: The thermodynamics of ammonium scheelites. III. An analysis of the heat capacity and related data of deuterated ammonium perrhenate ND4ReO4 [J. Chem. Phys. 85, 5963 (1986)] (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 3759-3759 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452784
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  • 6
    Electronic Resource
    Electronic Resource
    Coupled molecular dynamics/semiempirical simulation of organic solutes in polar liquids. II. Coumarin 153 in methanol and acetonitrile (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 6834-6842 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper we present a coupled molecular dynamics/semiempirical simulation of the solvation of the dye Coumarin 153 (C153) in two solvents, methanol and acetonitrile. In order to account for the solute electronic polarizability we use a semiempirical description to determine the charge distribution of the dye during the simulation. Solute–solvent and solvent–solvent interactions are described by empirical potentials. We examine the structure of the solvation shell, the purely electrostatic part of the solute–solvent interactions, shifts of the absorption and emissions spectra and the solvation dynamics of C153 in both solvents. In contrast with our first study of naphthalene in acetonitrile, the equilibrium simulations show structural changes in the solvation shell when electronic polarizability is included. The inclusion of electronic polarizability also enhances solute–solvent electrostatic interactions. Therefore, an increase of absorption and emission redshifts is observed compared to simulations with a nonpolarizable solute. While the computed absorption shift is in excellent agreement with experimental data, the emission shift calculations fail. Possible reasons for this failure are discussed. The solvation dynamics shows a considerable slowing down compared to the nonpolarizable solute. Nonetheless, linear response is still valid in these systems. Some differences with the continuum model of solvation are pointed out. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1351876
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  • 7
    Electronic Resource
    Electronic Resource
    Coupled molecular dynamics/semiempirical simulation of organic solutes in polar liquids. I. Naphthalene in acetonitrile (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 114 (2001), S. 6824-6833 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In this paper we present coupled quantum mechanical/molecular dynamics simulations on the solvation of naphthalene in acetonitrile. A semiempirical treatment is introduced into classical molecular dynamics simulations to deal with the electronic polarizability of the solute. We study the structure of the solvation shell, the features of the electrostatic intermolecular interactions, the dynamics of solute and solvent molecules and the spectral shifts of the solute. For this particular system it is found that the influence of induced electrostatic interaction on the structure of the solvation shell is negligible. On the other hand, net induced dipolar contributions arise in the electrostatic interactions, in spite of the fact that the electric field is found to be inhomogeneous at the scale of the solute molecule. These induced dipolar interactions enhance the calculated absorption and emission shifts and contribute up to 40% to the electrostatic spectral shifts. They also modify or even dominate the fluctuations of the solute–solvent interaction and thus the solvation response. Both shifts and solvation dynamics are discussed in terms of dipole and quadrupole jumps. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1351875
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  • 8
    Electronic Resource
    Electronic Resource
    Self-quenching of nitrobenzoxadiazole labeled phospholipids in lipid membranes (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 6019-6027 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The emission intensity, wavelength, and lifetime of the fluorophore nitrobenzoxadiazole dipalmitoylphosphatidylethanolamine (NBD-PE) are sensitive to the local environmental structure when this species is present as a component of an amphiphilic membrane. Alterations of the physical and electrostatic structure of a membrane can result in changes in the fluorescence signal owing to changes in the extent of self-quenching of the probe. To investigate self-quenching, NBD-PE was incorporated into monolayers and vesicles composed of Egg phosphatidylcholine at concentrations of 0.1 to 50 mol %. Monolayer samples were dipcast onto glass slides at a pressure of 35 mN m−1. Both the integrated intensity per fluorophore (quantum yield) from vesicles and dipcast monolayers, and the mean fluorescence lifetime from vesicles decreased as the concentration of fluorophore in the membranes was increased. At all concentrations studied the decay of NBD-PE fluorescence was fitted to two discrete exponentials, and both lifetime components were observed to change with concentration. The complexity of the fluorescence decay did not permit the use of standard theoretical models such as the Klafter–Blumen or Stern–Volmer equations which are normally employed to describe changes in fluorescence lifetime with changes in quencher concentration. Instead, a phenomenological approach was used to develop an empirical model of fluorescence self-quenching which could describe the observed alterations in the fluorescence lifetime and intensity. The model was based on a combination of Perrin quenching and Förster energy transfer. The fluorescence data was fit by a model wherein NBD-PE formed nonemissive trap sites with a critical radius of Rc=1.0±0.1 nm (Perrin quenching), with Förster energy transfer occurring to the trap sites with an R0 value of 2.55±0.10 nm as determined from spectral overlap integrals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467112
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  • 9
    Electronic Resource
    Electronic Resource
    Kinetics of optically detected magnetic resonance of single molecules (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 7182-7191 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Various time-resolved experiments on optically detected magnetic resonance (ODMR) of single pentacene molecules in p-terphenyl at 1.8 K are described and discussed with the help of a model based on the optical-microwave Bloch equations. Intersystem crossing rates for this system are deduced from the ODMR spectra, from the fluorescence correlation function, which varies nonmonotonically with the microwave power, and from the analysis of the fluorescence recovery transients. We also discuss the enhancement of the ODMR effect on using fluorescence photons from single molecules as a time base to trigger the microwaves in fluorescence recovery experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466916
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  • 10
    Electronic Resource
    Electronic Resource
    Photon statistical properties of visible laser diodes (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 928-931 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We investigate the factorial moments and photon correlation properties of two Sharp Corporation 780-nm laser diodes and assess their suitability for use in photon counting and correlation experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139578
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