Results 211 to 220 of about 75,849 (264)

Positron lifetime calculation for the elements of the periodic table

Journal of Physics Condensed Matter, 2007
Theoretical positron lifetime values have been calculated systematically for most of the elements of the Periodic Table. Self-consistent and non-self-consistent schemes have been used for the calculation of the electronic structure in the solid, as well as different parameterizations for the positron enhancement factor and correlation energy.
F Plazaola
exaly   +5 more sources

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Calculation of the lifetimes for intermediate Rydberg states

Physical Review B, 1989
Using a model we have previously developed, we have investigated the lifetime of the first five members of the Rydberg series that can exist in the vicinity of a metallic surface. We found that we enter quickly into the asymptotic regime, the whole process scaling finally as 1/n/sup 3/ and allowing one in principle to resolve the entire series.
, de Andres PL, , Echenique, , Flores
openaire   +2 more sources

Calculation of the Lifetime of a Metastable System

Physical Review, 1968
We have compared, in the context of a soluble model, two approximate methods of calculating the lifetime of a metastable state with the "exact" method. The exact method involves the usual relation $T=2\ensuremath{\hbar}{\ensuremath{\Gamma}}^{\ensuremath{-}1}$ between the lifetime $T$ of a metastable state and the displacement $\frac{\ensuremath{\Gamma}}
L. Celenza, W. Tobocman
openaire   +1 more source

Lifetime calculations in Yb II

Journal of Physics B: Atomic, Molecular and Optical Physics, 1998
Oscillator strengths and lifetime values for Yb II levels have been calculated within the framework of a pseudo-relativistic Hartree-Fock (HFR) approximation combined with a least-squares fitting of the calculated eigenvalues to the observed energy levels.
E Biémont, J-F Dutrieux, I Martin, P Quinet   +3 more
openaire   +1 more source

Calculation of Auger Lifetimes in HgCdTe

Journal of Electronic Materials, 2011
Band-to-band Auger recombination mechanisms in HgCdTe are investigated as functions of temperature in the small modulation limit by using realistic electronic structures obtained by empirical pseudopotential calculations and their corresponding wavevector-dependent dielectric functions. The calculated Auger lifetimes are compared with the semiempirical
Francesco Bertazzi, Michele Goano, Enrico Bellotti   +2 more
openaire   +1 more source

Positronium lifetime calculation

Physical Review D, 1993
A new approach to a positronium lifetime calculation is proposed. The method is completely relativistic and gauge invariant. The full positronium width is determined through several parameters connected with a dynamics of forming the bound state. These parameters play the same role as structure functions in the case of inclusive deep-inelastic lepton ...
openaire   +2 more sources

WKB Approach to Calculating the Lifetime of Quasistationary States

Physical Review Letters, 2000
A novel WKB approach to calculating the lifetime of quasistationary states in the potential wells of the form V(x)=P(x)-muQ(x), where P(x) is the radial part of the potential for the spherically symmetric harmonic oscillator or the hydrogen atom and Q(x) is a polynomial, is suggested.
J, Zamastil, J, Cízek, L, Skála
openaire   +2 more sources

Calculation of the lifetime of a Davydov soliton at finite temperature

Physical Review Letters, 1989
The standard Davydov Hamiltonian can be partially diagonalized using a method due to Eremko, Gaididei, and Vakhnenko. The complete Hamiltonian in this partially diagonalized form, hower, includes a term omitted by these authors. Using this term in a first-order perturbation-theory calculation results in an estimate of the lifetime of a Davydov soliton ...
, Cottingham, , Schweitzer
exaly   +3 more sources

On the Pekar and Perlin Calculation of F‐Center Lifetimes

physica status solidi (b), 1963
AbstractIn a recent paper PEKAR and PERLIN presented a calculation, based upon PEKAR's continuum theory of the F‐center, of the radiative lifetime of the first excited level of the F‐center. Their results are in order‐of‐magnitude agreement with the experimental results of SWANK and BROWN. In this paper we argue that such agreement is fortuitous and is
W. Beall Fowler, D. L. Dexter
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First-principles calculation of positron lifetimes in solids

Physical Review B, 1991
We present a first-principles approach for calculating the positron lifetime in metals. Convenient expressions are provided for the electron-positron correlation function and the enhancement factor. Calculations on a wide range of elemental metals and some monovacancies are found to be in excellent agreement with experiment. The approximations inherent
, Sterne, , Kaiser
openaire   +2 more sources