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In this work we report the modification of the normal Auger line shape under the action of an intense x-ray radiation. Under strong Rabi-type coupling of the core, the Auger line profile develops into a doublet structure with an e...
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In this work we report the modification of the normal Auger line shape under the action of an intense x-ray radiation. Under strong Rabi-type coupling of the core, the Auger line profile develops into a doublet structure with an energy separation mainly determined by the relative strength of the Rabi coupling. In addition, we find that the charge resolved ion yields can be controlled by judicious choice of the x-ray frequency.
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The influence of nonlinear interference effects (NIEF) on the radiation redistribution functions is investigated in terms of the atomic density matrix formalism. The ion motion is considered within the model microfield method. The...
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The influence of nonlinear interference effects (NIEF) on the radiation redistribution functions is investigated in terms of the atomic density matrix formalism. The ion motion is considered within the model microfield method. The particular calculations have been performed for the spectral doublet (1s2s) S-1-(1s4p) P-1,(1s2s) S-1-(1s4d) D-1 of helium-like ion Al11+ in hot dense plasmas (T = 350 eV, N-e = 10(19)-10(20) cm(-3)). Taking account of both NIEF and ion dynamics is essential in the line centre and the nearest wings of the scattered radiation. [References: 15]
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We present a theoretical investigation, in the effective-mass approximation, of exciton mixing and 1s - 2p(+/-) internal transitions of neutral magnetoexcitons in GaAs-Ga1-xAlxAs quantum wells. Theoretical results are obtained by ...
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We present a theoretical investigation, in the effective-mass approximation, of exciton mixing and 1s - 2p(+/-) internal transitions of neutral magnetoexcitons in GaAs-Ga1-xAlxAs quantum wells. Theoretical results are obtained by diagonalizing the Kohn-Luttinger Hamiltonian in the presence of an external magnetic field along the growth direction of the quantum well, with mixing of appropriate light- and heavy-hole exciton states taken into account. We first perform the exciton calculations in the diagonal approximation, and take the exciton-envelope wave functions as linear combinations of products of hole and electron quantum-well states with Gaussian functions. Effects of exciton mixing are then calculated within perturbation theory. Theoretical results for the exciton internal transitions from 1s-like to 2p(+/-)-like magnetoexciton states in GaAs-Ga1-xAlxAs quantum wells, with well widths of 80 Angstrom, 100 Angstrom, 125 Angstrom, 150 Angstrom and 200 Angstrom, are found in overall agreement with optically detected resonance measurements. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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Electroabsorption spectra of merocyanine (PMC) produced by an photochromic reaction of spiropyran (SP) in a PMMA polymer film have been measured. The intensity of the sharp absorption band assigned as an aggregate of PMC was found...
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Electroabsorption spectra of merocyanine (PMC) produced by an photochromic reaction of spiropyran (SP) in a PMMA polymer film have been measured. The intensity of the sharp absorption band assigned as an aggregate of PMC was found to be remarkably reduced by an external electric field. The photochromic reaction from the aggregate of PMC to SP is suggested to be markedly enhanced by an electric field. [References: 9]
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Precise theoretical transmission coefficients calculations provide an extremely good account of individual Wannier-Stark states splitting and localization effects, resolved recently in a highly accurate experiment for four and fiv...
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Precise theoretical transmission coefficients calculations provide an extremely good account of individual Wannier-Stark states splitting and localization effects, resolved recently in a highly accurate experiment for four and five period finite superlattices. At the same time, we show that the so-called Wannier-Stark ladders, predicted for nfinite systems are absent for finite superlattices. The observed energy levels are nothing else than the intra miniband energy levels.
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The cross sections of the Rydberg electron L-mixing in a hydrogen atom and a hydrogen-like ion are calculated for slow collisions with atomic ions H*(n, L) +A(+) = H*(n, L') +A(+) without variation of the principal quantum number ...
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The cross sections of the Rydberg electron L-mixing in a hydrogen atom and a hydrogen-like ion are calculated for slow collisions with atomic ions H*(n, L) +A(+) = H*(n, L') +A(+) without variation of the principal quantum number n. The probability of the L-mixing L -> L' is associated with the quantum interference of the wave functions of adiabatic states, i.e., with the mixing of the time phases of these functions exp(-i integral E-k (t)dt). The effective cross section of such L-mixing for the states with n = 28 are 4-5 orders of magnitude greater than the cross sections determined in previous investigations. The expansion coefficients of spherical Coulomb wave functions in terms of parabolic ones and vice versa, which are necessary for cletennining cross sections, are calculated on the basis of a comprehensive analysis of the spatial properties of these functions.
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We consider the energy levels of a Stark family, in the parameter j, of quartic double wells with perturbation parameter g: H(g, j) = p(2) + x(2)(1 - gx)(2) - j (gx - 1/2). For non-even j (and for the symmetric case j = 0) we prov...
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We consider the energy levels of a Stark family, in the parameter j, of quartic double wells with perturbation parameter g: H(g, j) = p(2) + x(2)(1 - gx)(2) - j (gx - 1/2). For non-even j (and for the symmetric case j = 0) we prove analyticity in the full Nevanlinna disk Rg(-2) > R(-1) of the g(2)-plane, as predicted by Crutchfield. By means of an approximation we give a heuristic estimate of the asymptotic small g behaviour, showing the relation between the avoided crossings and the failure of the usual perturbation series. [References: 19]
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We use the theory of Kolyvagin systems to prove (most of) a refined class number formula conjectured by Darmon. We show that, for every odd prime p, each side of Darmon's conjectured formula (indexed by positive integers n) is 'al...
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We use the theory of Kolyvagin systems to prove (most of) a refined class number formula conjectured by Darmon. We show that, for every odd prime p, each side of Darmon's conjectured formula (indexed by positive integers n) is 'almost' a p-adic Kolyvagin system as n varies. Using the fact that the space of Kolyvagin systems is free of rank one over Z(p), we show that Darmon's formula for arbitrary n follows from the case n = 1, which in turn follows from classical formulas.
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