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Utilizing the first Born approximation and an eikonal/closure approximation plus Bethe's generalized-oscillator-strength (GOS) formalism, we evaluate s - and p -shell ionization of Ne and Ar. Partial-wave contributions to the GOS are calculated using an analytic independent-particle model (IPM)...
A quantum-lattice-gas model of He 3 - He 4 mixtures is proposed which includes the effects of the Bose and Fermi statistics. The effect of the hard-core interaction between all particles is included by altering the commutation relations of the field operators. The phase diagram of the model is...
Average-electron-density measurements in a neon discharge afterglow have been made using a T M 010 microwave cavity. The quartz and Pyrex tubes have a 2.18-cm inner diameter and are 90 cm long ( Λ 2 = 0.206 cm 2 ) with hollow nickel and molybdenum cylindrical electrodes. The gas pressure is 0.5...
We have measured the optical-excitation function and polarization of the 4227-Å line, using crossed electron and calcium beams, for electron energies from threshold to 1400 eV. In the high-energy region, from 100-450 times the threshold energy, we have used the Bethe theory to normalize our...
A measurement is presented of the anisotropic liquid-structure factor of p - n -octyloxybenzylidene- p ′ -toluidine in the nematic phase using monochromatic Cu K α radiation. This material has a smectic A phase at lower temperature and exhibits strong pretransition scattering in the nematic...
An approximate form of the Faddeev equations has been applied to the charge-transfer process in proton-hydrogen collisions. The effect of coupling with the direct channel has been taken into account. This formalism satisfies the unitarity condition below the breakup threshold. Results for the...
The radiative decay of metastable nsnp P 0 3 atomic states is found to occur only by odd-parity multiphoton modes such as E 1 M 1 and 3 E 1 , in the absence of hyperfine structure. A detailed calculation of the E 1 M 1 rates for several members of the Be sequence is presented, in the...
A molecular theory of collective modes in liquid crystals is developed in the large-wave-vector regime with the use of a self-consistent-field method. The effects of orientational ordering on the translational collective modes are derived. A soft mode is obtained.
The behavior of interacting electrons is dominated by the Coulomb repulsion in the limit of zero interparticle separation. Hence, in this limit the derivative of the two-particle correlation function is equal to the two-particle correlation function itself divided by the Bohr radius. Because...
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