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  • 1
    Electronic Resource
    Electronic Resource
    From classical to quantum mechanics with hard chaos (1988)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 92 (1988), S. 3154-3163 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100322a026
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  • 2
    Electronic Resource
    Electronic Resource
    Thermodynamics of a quadrupolar hard diatomic fluid using a perturbation theory with nonspherical reference system (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 4636-4642 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100348a046
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of alkali-metal counterion identity on the sphere-to-rod transition in alkyl sulfate micelles (1989)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 8354-8366 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100363a014
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  • 4
    Electronic Resource
    Electronic Resource
    Terahertz time-domain measurement of the conductivity and superconducting band gap in niobium (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 2238-2241 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We measure the complex conductivity of thin superconducting niobium films using coherent time-domain terahertz spectroscopy. Both real and imaginary part of the conductivity are measured simultaneously without referring to the Kramers–Kronig relations. We also measure the superconducting band gap directly from the onset of absorption and compare our results with theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349415
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  • 5
    Electronic Resource
    Electronic Resource
    A reference hypernetted-chain equation for soft potentials. Atomic and molecular Lennard-Jones systems (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 2724-2732 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A recently proposed reference hypernetted-chain equation based on a semiphenomenological bridge function due to Verlet is reformulated for atomic and molecular Lennard-Jones liquids. In this new approximation we treat the size of the reference-system hard particles as a function of density and temperature through a functional relationship presented herein. The theory yields excellent results for the structure and thermodynamics of atomic Lennard-Jones liquids over a wide range of temperature and density and is quite satisfactory for Lennard-Jones homonuclear diatomics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463062
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  • 6
    Electronic Resource
    Electronic Resource
    Observation of torsional motion in the ground-state cation of jet-cooled tolane by two-color threshold photoelectron spectroscopy (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 1649-1654 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: High-resolution threshold photoelectron spectra of jet-cooled tolane (C6H5–C≡C–C6H5) have been obtained by two-color (1+1') resonantly enhanced multiphoton ionization via the S1 state {1B1u(ππ*)}. From the threshold photoelectron spectra, the adiabatic ionization energy has been determined to be Ia = 63 917 ± 3 cm−1 (7.9243±0.0004 eV). A vibrational progression due to torsional motion in the cation ground state was observed up to its fifth quantum level with a fundamental frequency of 54 cm−1, showing small anharmonicity. From these results, we have evaluated the potential barrier height to the torsional motion to be 1980±60 cm−1. The threshold photoelectron spectra obtained via several S1 vibronic levels exhibit dominant peaks due to the Δv=0 ionization transitions. This fact indicates that no significant change occurs in molecular structure upon photoionization with removal of the antibonding π electron from the S1 state. Threshold photoelectron bands arising from formally forbidden odd quantum transitions in the torsional mode were also clearly observed with small intensities. The mechanism of the appearance of such a nontotally symmetric mode is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463153
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamic light scattering by aqueous solutions of rodlike fd-virus particles (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 6284-6289 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Dynamic light scattering (DLS) measurements on aqueous solutions of rodlike fd-virus particles (length=880 nm, diameter=9 nm) below and above the overlap concentration c*=1 particle/length3 are reported. In samples with screened Coulomb interaction the short-time behavior of the time correlation functions does not show a significant concentration dependence, in contrast to samples at very low ionic strength (strong Coulomb interaction), where the short-time behavior is dominated by the static structure factor S(q). In this case S(q) derived by DLS methods, using an equation that has been proved for interacting spherical particles and weakly interacting rods, is in excellent agreement with S(q) determined by static light scattering (SLS) up to a particle concentration of about 5c*. Above significant deviations are found. At very low ionic strength the existence of a distinct very long tail in the time correlation function as previously reported can be confirmed, but the new experiments suggest that this is due to dust particles and aggregates and not to the interaction between the fd particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461548
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  • 8
    Electronic Resource
    Electronic Resource
    Vibronic coupling in the ground cationic state of naphthalene: A laser threshold photoelectron [zero kinetic energy (ZEKE)-photoelectron] spectroscopic study (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 7763-7772 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The two-color (1+1') threshold photoelectron spectra of naphthalene in a supersonic free jet have been recorded via nine vibronic levels of the S1 electronic state up to about 1420 cm−1 above the S1 band origin. The threshold photoelectron spectra recorded via the S1 band origin and via totally symmetric ag vibronic levels show significant intensity in Δν=+1 transitions in nontotally symmetric vibrations having b1g symmetry indicating that the ionization transition gains significant intensity through a vibronic coupling mechanism between the two lowest doublet cationic states. The strongest departure from the expected Δν=0 propensity in the threshold photoelectron spectra occurs through excitation of the totally symmetric 8 mode having ag symmetry indicating that a considerable displacement occurs along the normal coordinate of this 8 mode upon ionization from the S1 state. The superior resolution of the threshold photoelectron technique over conventional photoelectron methods has allowed accurate values for the fundamental vibrational frequencies of naphthalene in its ground cationic state to be determined and it has also allowed a more rigorous investigation of the vibronic coupling mechanism that occurs between the two lowest doublet cationic states. Moreover, an improved value for the adiabatic ionization energy of naphthalene of 65 687±7 cm−1 (8.1442±0.0009 eV) has been determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464584
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  • 9
    Electronic Resource
    Electronic Resource
    On the use of semiphenomenological closures in integral equations for classical fluids (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 6132-6137 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have studied two choices of semiphenomenological closures for the Ornstein–Zernike equation, both for a monoatomic Lennard-Jones fluid and a dipolar homonuclear hard diatomic fluid. One of the closures was originally proposed by Verlet for hard-sphere systems, for which is known to yield good results. A second closure is proposed by us in the frame of the reference hypernetted chain (RHNC) theory. We have described the reference systems in this closure by means of Verlet's approximation and its recent extension to systems of nonspherical particles. This second approach, which we denote by RHNC-VM (Verlet's modified), turns out to give an excellent description of the structure and thermodynamics of the Lennard-Jones fluid and very accurate predictions for the structure of the dipolar diatomic system. In this latter case the apparent superiority of hypernetted chain results for configurational energies is found to stem from fortuitous cancellation of errors in the integration of the components of the pair correlation function. Nonetheless, an approximation for the bridge function capable of accounting for the particular dielectric behavior of the dipolar diatomic fluid is still lacking.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462656
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  • 10
    Electronic Resource
    Electronic Resource
    Laser threshold photoelectron spectra of the cis and trans rotational isomers of p-dimethoxybenzene–Arn (n=0,1,2): Observation of the intermolecular van der Waals stretching and bending vibrational modes in the cation (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 4679-4689 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The cis and trans rotational isomers of p-dimethoxybenzene–Arn (n=0,1,2) have been studied in a supersonic free jet by two-color laser resonance enhanced multiphoton ionization threshold photoelectron spectroscopy. The two-color (1+1') threshold photoelectron spectra recorded via the S1 state of the cis and trans isomers of the 1:1 and 1:2 argon complexes reveal well resolved vibrational structure characteristic of the low frequency bending and stretching van der Waals vibrational modes. In the case of the trans isomer of the 1:2 complex, a very low frequency progression (11 cm−1) in a nontotally symmetric van der Waals bending mode appears in single quanta in the spectrum. The equivalent spectrum recorded for the cis isomer exhibits structure characteristic of van der Waals stretching modes as well as double quanta excitation in both totally symmetric and nontotally symmetric van der Waals bending modes. The observation of single quantum excitation in formally forbidden van der Waals vibrational modes implies the possibility of a change in the overall symmetry of the complex in the ground cationic state when compared to that in the S1 state. The adiabatic ionization energies (Ia) for the cis and trans isomers of p-dimethoxybenzene–Arn (n=0,1,2) were measured as 60 774±7 (cis; n=0), 60 687±7 (cis; n=1), 60 509±7 (cis; n=2), 60 563±7 (trans; n=0), 60 479±7 (trans; n=1), and 60 295±7 cm−1 (trans; n=2).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463869
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