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Articles 1 - 9 of 9
Full-Text Articles in Physics
Stabilization Of Bound State Decay In An Intense Monochromatic High-Frequency Field, N. L. Manakov, M. V. Frolov, Bogdan Borca, Anthony F. Starace
Stabilization Of Bound State Decay In An Intense Monochromatic High-Frequency Field, N. L. Manakov, M. V. Frolov, Bogdan Borca, Anthony F. Starace
Anthony F. Starace Publications
The formalism of complex quasienergies is used for exact calculation of the field-dependent decay rate for a weakly bound particle (in the model of a three-dimensional zero-range potential) in a strong monochromatic laser field. It is shown that the adiabatic (quasistationary) stabilization regime in this model occurs at frequencies ω exceeding the binding energy and only in a limited intensity range. A simple estimate is obtained for the critical field of stabilization breakdown. The effect may be observed for the decay of H– ions in the field of a neodymium laser of femtosecond duration.
Control Of Intense Laser- Atom Processes With Strong Static Fields, Dejan B. Milosevic, Anthony F. Starace
Control Of Intense Laser- Atom Processes With Strong Static Fields, Dejan B. Milosevic, Anthony F. Starace
Anthony F. Starace Publications
Atomic processes in the presence of intense fields continue to attract a great deal of attention [1-3]. Key goals of research in this area are to increase the intensities and frequencies of coherent light produced in these processes. In two recent works [4,5] we have demonstrated theoretically the possibility of controlling intense laser-atom interaction processes by employing strong, but experimentally feasible, static electric or magnetic fields. Thus, in Ref. [4] we demonstrated how a strong static electric field may induce a high-energy plateau for scattered x-ray photons in laser-assisted, x-ray-atom scattering in which the incident x-rays were assumed to have …
Control Of High-Harmonic Generation And Laser-Assisted X-Ray-Atom Scattering With Static Electric And Magnetic Fields, D. B. Milošević, Anthony F. Starace
Control Of High-Harmonic Generation And Laser-Assisted X-Ray-Atom Scattering With Static Electric And Magnetic Fields, D. B. Milošević, Anthony F. Starace
Anthony F. Starace Publications
We consider the use of strong static fields to control two related atomic processes: laser-assisted x-ray-atom scattering (XAS) and high-harmonic generation (HHG). We first analyze the laser field intensity dependence of the differential cross section (DCS) plateau structures for the laser-assisted XAS process in the presence of a static electric field as a function of the number of photons exchanged with the laser field. Besides the recently discovered (Milošević, D.B. and Starace, A.F., 1998, Phys. Rev. Lett., 81, 5097) extended plateau for absorbed photons, which indicates a substantial increase of the scattered x-ray energies, a new plateau, having many …
Two-Photon Detachment Cross Sections And Dynamic Polarizability Of H- Using A Variationally Stable, Coupled-Channel Hyperspherical Approach, Mauro Masili, Anthony F. Starace
Two-Photon Detachment Cross Sections And Dynamic Polarizability Of H- Using A Variationally Stable, Coupled-Channel Hyperspherical Approach, Mauro Masili, Anthony F. Starace
Anthony F. Starace Publications
We present a generalization of the variationally stable method of Gao and Starace [B. Gao and A. F. Starace, Phys. Rev. Lett. 61, 404 (1988); Phys. Rev. A 39, 4550 (1989)] for two-electron atoms and ions that incorporates a coupled-channel adiabatic hyperspherical approach. Using this approach, we report results for two-photon detachment of H-, in which we have coupled one, two, three, and four adiabatic hyperspherical channels within each term level of the initial, intermediate, and final states. We present results also for the dynamic polarizability of H- as well as for the one-photon detachment cross section. …
Static-Electric-Field-Induced Polarization Effects In Harmonic Generation, Bogdan Borca, A.V. Flegel, M.V. Frolov, N. L. Manakov, Dejan B. Milosevic, Anthony F. Starace
Static-Electric-Field-Induced Polarization Effects In Harmonic Generation, Bogdan Borca, A.V. Flegel, M.V. Frolov, N. L. Manakov, Dejan B. Milosevic, Anthony F. Starace
Anthony F. Starace Publications
Two static-electric-field-induced effects on harmonic generation are demonstrated analytically and numerically: elliptic dichroism (in which the harmonic yield is different for right and left elliptically polarized laser fields) and elliptical polarization of harmonics produced by linearly polarized driving laser fields. Both effects stem from interference of real and imaginary parts of the nonlinear atomic susceptibilities. Possibilities for experimentally measuring these effects are discussed.
Exact Analytic Relation Between Quantum Defects And Scattering Phases With Applications To Green’S Functions In Quantum Defect Theory, V. E. Chernov, N. L. Manakov, Anthony F. Starace
Exact Analytic Relation Between Quantum Defects And Scattering Phases With Applications To Green’S Functions In Quantum Defect Theory, V. E. Chernov, N. L. Manakov, Anthony F. Starace
Anthony F. Starace Publications
The relation between the quantum defects, μλ, and scattering phases, δλ, in the single-channel Quantum Defect Theory (QDT) is discussed with an emphasis on their analyticity properties for both integer and noninteger values of the orbital angular momentum parameter λ. To derive an accurate relation between μλ and δλ for asymptotically-Coulomb potentials, the QDT is formally developed for the Whittaker equation in its general form “perturbed” by an additional short-range potential. The derived relations demonstrate that μλ is a complex function for above-threshold energies, which is analogous to the fact that δ …
Factorized Representation For Parity-Projected Wigner DJ (Β) Matrices, N.L. Manakov, A.V. Meremianin, Anthony F. Starace
Factorized Representation For Parity-Projected Wigner DJ (Β) Matrices, N.L. Manakov, A.V. Meremianin, Anthony F. Starace
Anthony F. Starace Publications
An alternative representation for the parity-projected Wigner dj(β) rotation matrix is derived as the product of two triangular matrices composed of Gegenbauer polynomials with negative and positive upper indices, respectively. We relate this representation for dj(β) to the one presented by Matveenko [Phys. Rev. A 59, 1034 (1999)], which, in contrast with our result, requires for its evaluation a matrix inversion. In addition, identities for bilinear sums of Gegenbauer polynomials are derived. This work is based on our recently introduced invariant representations for finite rotation matrices [Phys. Rev. A 57, 3233 (1998)].
Mirroring And Mimicking Of Partial Cross Sections In The Vicinity Of A Resonance, Chien-Nan Liu, Anthony F. Starace
Mirroring And Mimicking Of Partial Cross Sections In The Vicinity Of A Resonance, Chien-Nan Liu, Anthony F. Starace
Anthony F. Starace Publications
We review recent analytical work on mirroring and mimicking behavior of resonance profiles in different partial cross sections. This work is related to the work of Fano and Cooper on resonance profiles in total cross sections and that of Starace on resonance profiles in partial cross sections. Applications of the new theories (describing mirroring and mimicking behavior) to recent experimental measurements and theoretical predictions for photoionization, photodetachment, and Auger spectroscopy in the vicinity of resonance structures are discussed.
Interaction Of Laser Radiation With A Negative Ion In The Presence Of A Strong Static Electric Field, N. L. Manakov, M. V. Frolov, Anthony F. Starace, Ilya I. Fabrikant
Interaction Of Laser Radiation With A Negative Ion In The Presence Of A Strong Static Electric Field, N. L. Manakov, M. V. Frolov, Anthony F. Starace, Ilya I. Fabrikant
Anthony F. Starace Publications
This paper provides a general theoretical description of a weakly bound atomic system (a negative ion) interacting simultaneously with two (generally strong) fields, a static electric field and a monochromatic laser field having an arbitrary elliptical polarization. The zero-range δ-potential is used to model the interaction of a bound electron in a negative ion as well as the interaction of a detached electron with the residual atom. Our treatment combines the quasistationary (complex energy) and quasienergy (Floquet) approaches. This quasistationary, quasienergy state (QQES) formalism is the most appropriate one for analysing a decaying quantum system under the influence of a …