Now showing items 1-10 of 491
Laser‐driven hydrodynamic perturbation in an overdense Z‐pinch plasma
(The American Institute of Physics, 1979-04)
Holographic interferometry of the interaction of a radially incident intense CO2 laser beam (1011 W/cm2, 38‐nsec FWHM pulse) with an overdense helium Z‐pinch plasma (ne≳1019 e/cm3, Te∼20 eV, L=100 μm) has indicated the ...
Ionization Rates in (AlxGa1−x)As
(The American Institute of Physics, 1970-10)
The ionization rates of (AlxGa1−x) As have been measured as a function of the Al content and the results are presented here. Values of both A and b are found to increase with Al content. It is also found that for low values ...
Measurements of molecular hyperpolarizabilities for ethylene, butadiene, hexatriene, and benzene
(The American Institute of Physics, 1978-12-15)
Third‐order polarizabilities are measured in the gas phase using dc electric‐field induced optical second‐ harmonic generation and are found to be positive in each case.
Density and Current Density as Coordinates for a System of Interacting Bosons at Absolute Zero
(The American Institute of Physics, 1971-06)
The quantum field Hamiltonian expressed in terms of density and current density variables has been employed together with the equal‐time commutation relations among these variables to find the ground state energy and the ...
Conductivity of a system of metallic particles dispersed in an insulating medium
(The American Institute of Physics, 1973-06)
The variation of the conductivity of metal‐particle—insulator systems with the volume percent of metal is explained in terms of an ``effective medium'' theory.
Jet production by a gluon source in QCD
(Elsevier, 1978-12-25)
The properties of jets produced by a gluon source are examined in QCD. We give a simple derivation of the jet opening angle (up to an undetermined constant) using arguments of general applicability. At asymptotic energies, ...
Obtaining real parts of scattering amplitudes directly from cross section data using derivative analyticity relations
(Elsevier, 1974-04-15)
We show that one can obtain real parts of scattering amplitudes by knowing the imaginary parts at only nearby energies. This is accomplished by re-casting the dispersion integral into an equivalent form which we will calla ...
Euclidean Fermi fields with a hermitean Feynman-Kac-Nelson formula. I
(Springer-Verlag, 1974-03)
We construct free, Euclidean, spin one-half, quantum fields with the following properties: (i) CAR; (ii) Symanzik positivity; (iii) Osterwalder-Schrader positivity; (iv) no doubling of particle or spin states. They admit ...
Measurement of sonic velocity in liquid Refrigerant 12
(The American Institute of Physics, 1977-08)
The sonic velocity in subcooled liquid Refrigerant 12 (CCl2F2) was measured at 26.7 °C using an apparatus designed to investigate transients associated with pipe blowdown. The mean value for sonic velocity obtained from ...
Behavior of Gas Bubbles in Viscoelastic Materials in a Creep Process
(The American Institute of Physics, 1972-07)
This paper investigates the dynamic behavior of a spherical bubble situated in viscoelastic (or elasticoviscous) materials in a creep process. Both the diffusion of the dissolved gas in the material and the thermodynamic ...