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  • 1
    Electronic Resource
    Electronic Resource
    A theoretical investigation of the low-lying electronic states of the molecule BeH+ (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 7237-7244 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A theoretical study at the multireference singles and doubles configuration-interaction level is reported for the six lowest electronic states of BeH+. Of the four new states described, the 1Π and 3Π are bound states supporting at least 8 and 12 vibrational levels, respectively. Two 3Σ+ states are repulsive. For the two known 1Σ+ states improved results are also presented. For all these states, dipole moments and transition moments have been computed. For the bound states, besides the vibrational levels, transition probabilities, radiative lifetimes, vibrationally averaged dipole moments, and a set of spectroscopic constants are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460207
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  • 2
    Electronic Resource
    Electronic Resource
    Cross sections and photoelectron asymmetry parameters for photoionization of H2O (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 2362-2366 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The iterative Schwinger variational method is used to obtain cross sections and photoelectron asymmetry parameters for photoionization of the three outermost valence orbitals (1b1, 3a1, and 1b2) of H2O for photon energies from near threshold to 50 eV. A comparison of these calculated results with available experimental data is encouraging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457977
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  • 3
    Electronic Resource
    Electronic Resource
    Studies of the photoionization cross sections of CH4 (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 2998-3001 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present cross sections and asymmetry parameters for photoionization of the 1t2 orbital of CH4 using static-exchange continuum orbitals of CH+4 to represent the photoelectron wave function. The calculations are done in the fixed-nuclei approximation at a single internuclear geometry. To approximate the near-threshold behavior of these cross sections, we assumed that the photoelectron spectrum is a composite of three electronic bands associated with the Jahn–Teller components of the distorted ion. The resulting cross sections reproduce the sharp rise seen at threshold in the experimental data and are in good agreement with experiment at higher energy. The agreement between the calculated and measured photoelectron asymmetry parameters is, however, less satisfactory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455006
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  • 4
    Electronic Resource
    Electronic Resource
    Stabilization of Z pinch by velocity shear (2000)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 7 (2000), S. 4632-4643 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A numerical experiment is run to assess the stabilization of ideal magnetohydrodynamic (MHD) instabilities by externally applied velocity shear. A Z pinch, unstable to both kink and interchange (sausage) instabilities, is subjected to an external force that drives sheared mass flow along the axis. The turbulence from the MHD instabilities is found to be suppressed significantly with increasing Mach number of the flow. At sonic Mach numbers of 4–5, the "discharge" is seen to have recovered to its laminar state in more than 95% of the volume, there being a small residual wobble at the center of the column. For lower Mach numbers, the wobble becomes more significant. This is consistent with analytic theories that predict supersonic sheared flows are needed to stabilize MHD instability. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1316086
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  • 5
    Electronic Resource
    Electronic Resource
    Kinetic modes in a hot magnetized and weakly collisional plasma (1999)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 6 (1999), S. 2323-2331 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Velocity space perturbations associated with low-frequency waves launched in a weakly collisional plasma are shown to consist of a discrete spectrum of modes. Collisions are modeled using an energy and momentum conserving one-dimensional Fokker–Planck operator. The linearized Vlasov–Poisson–Fokker–Planck system of equations is solved by expanding the perturbed ion-distribution function in terms of Hermite polynomials, from which an eigenvalue problem is set up. The eigenvalues and eigenvectors yield the ion acoustic mode that is weakly damped [J. Dougherty, Physics of Fluids 7, 1788 (1964)], as well as a discrete spectrum of kinetic modes. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.873504
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  • 6
    Electronic Resource
    Electronic Resource
    Ripple method: An application of the square-wave excitation method for heat-capacity measurements (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 1176-1181 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An extension of the square-wave excitation method for measuring heat capacity is reported. In particular, attention is focused on the limit where the period of the heat pulse excitation is much smaller than the thermal relaxation time of the calorimeter-sample system. In this limit, one finds that the thermal ripple induced by the heat pulse is inversely proportional to the heat capacity. This technique allows one to do real-time heat-capacity measurements as in the conventional ac technique with the same instrumentation as the square-wave method. The ripple method is demonstrated with a measurement of the heat capacity of strained Al near its superconducting phase transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139745
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  • 7
    Electronic Resource
    Electronic Resource
    On the low-lying electronic states of the molecule BeN (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 9086-9093 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using the multireference singles and doubles configuration-interaction approach, this study presents for the first time reliable theoretical evidence of the existence of a new molecular species, BeN. Potential-energy curves, vibrational energy spacings, dissociation energies, dipole moments, and the associated spectroscopic constants are reported for the first ten lowest electronic states. Comparisons with other isoelectronic diatomics are presented. Perturbative effects are expected to play a non-negligible role in the spectroscopy of this molecule due to the closeness of the electronic and vibrational states. The global picture of the electronic states presented will certainly be an important aid to the experimentalist to search for this molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461187
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetoresistance of the random anisotropic Co70.4Fe4.6Si15B10 alloy : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6387-6389 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Longitudinal magnetoresistance measurements in Co70.4Fe4.6Si15B10 are reported for applied magnetic fields H varying from 0 to ±15 Oe. Two regimes were observed: one which increases with H2 and another which decreases with M2 for higher fields. The maximum in the magnetoresistance is observed for H=2.4 Oe for samples annealed for 15 min at 573 K in a transverse magnetic field of 2 kOe. The measured variation in R(H) from H=0 to 2.4 was about 0.2%. The value of H=2.4 is nearly the same field where a field-induced transition in the magnetization was observed. For samples annealed in the absence of the magnetic field the H2 term is the only one observed. The present results can be accounted for by the rotational model for uniaxial transverse anisotropy and the results are also in agreement with the random anisotropy model used to discuss the irreversibility and the field-induced transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352659
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  • 9
    Electronic Resource
    Electronic Resource
    Photoionization cross sections and asymmetry parameters for silane (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 7228-7232 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present calculated results of photoionization cross sections and photoelectron angular distributions for ionization out of the two outermost 2t2 and 3a1 valence orbitals of silane for photon energies ranging from near threshold to 50 eV. The iterative Schwinger variational method in the exact static-exchange level is applied to obtain the continuum photoelectron orbitals. A generally good agreement is observed between our calculated cross sections and the experimental data available in the literature. In addition, a striking similarity has been observed between the photoionization properties of the 1t2 orbital of methane and the 2t2 orbital of silane. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478626
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  • 10
    Electronic Resource
    Electronic Resource
    Giant ac magnetoresistance in the soft ferromagnet Co70.4Fe4.6Si15B10 : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6563-6565 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: ac magnetoresistance (MR) measurements performed in thin ribbons of the amorphous soft ferromagnet Co70.4Fe4.6Si15B10 are reported with a longitudinal dc applied magnetic field H varying from 0 to ±15 Oe. The dependence of the MR with the frequency f of the measuring ac current was investigated for 0.4≤f≤100 kHz. No significant frequency dependence in the resistivity ρ for H=0 and H=±15 Oe was found. For intermediate values of H, ρ(H) presents a peak in H which increases linearly in frequency. The MR peak in H at room temperature varies from typical values of 0.13% in the low-frequency range to a giant value of 27% at 100 kHz. Two possible sources for the frequency dependence of the magnetoresistance in amorphous alloys are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356919
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