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Full-Text Articles in Physics
Threshold Effects On Angular Distributions For Multiphoton Detachment By Intense Elliptically Polarized Light, Bogdan Borca, M.V. Frolov, N. L. Manakov, Anthony F. Starace
Threshold Effects On Angular Distributions For Multiphoton Detachment By Intense Elliptically Polarized Light, Bogdan Borca, M.V. Frolov, N. L. Manakov, Anthony F. Starace
Anthony F. Starace Publications
Unusual threshold effects are found theoretically in the frequency and intensity dependence of angular distributions produced by an elliptically polarized laser as well as in the elliptic dichroism parameter, which measures the asymmetry of the angular distribution.
Comment On “Photodetachment In Combined Static And Dynamic Electric Fields”`, Ilya I. Fabrikant, M.V. Frolov, N. L. Manakov, Anthony F. Starace
Comment On “Photodetachment In Combined Static And Dynamic Electric Fields”`, Ilya I. Fabrikant, M.V. Frolov, N. L. Manakov, Anthony F. Starace
Anthony F. Starace Publications
The theoretical analysis of C. Rangan and A. R. P. Rau [Phys. Rev. A 61, 033405 (2000)] on the process of photodetachment of H- in a strong static electric field, which calls into question the predictions of B. Gao and A. F. Starace [Phys. Rev. A 42, 5580 (1990)] and also of M. Q. Bao et al. [Phys. Rev. A 58, 411 (1998)], is shown in this Comment to be incorrect. First, we point out that a number of assumptions of Rangan and Rau’s analysis rest on tenuous theoretical grounds. Second, we adduce two completely independent and different …
Invariant Spinor Representations Of Finite Rotation Matrices, N. L. Manakov, A. V. Meremianin, Anthony F. Starace
Invariant Spinor Representations Of Finite Rotation Matrices, N. L. Manakov, A. V. Meremianin, Anthony F. Starace
Anthony F. Starace Publications
Our recent results [N. L. Manakov et al., Phys. Rev. A 57, 3233 (1998); 61, 022103 (2000)] on the invariant representations of finite rotation matrices (FRM’s) of integer rank j (in terms of tensor products of vectors connected with a space-fixed reference frame) are generalized here for the general case of arbitrary (i.e., integer or half-integer) rank j. This extension is carried out by using new spinor representations of FRM’s in terms of specially introduced spinor-annihilation operators. We demonstrate that all widely used, standard representations of FRM’s follow as special cases of our invariant representation for particular parametrizations …
Static-Electric-Field Behavior In Negative Ion Detachment By An Intense, High-Frequency Laser Field, M. V. Frolov, N. L. Manakov, B. Borca, Anthony F. Starace
Static-Electric-Field Behavior In Negative Ion Detachment By An Intense, High-Frequency Laser Field, M. V. Frolov, N. L. Manakov, B. Borca, Anthony F. Starace
Anthony F. Starace Publications
Based upon the exact numerical solution of the complex quasienergy problem for a 3-dimensional short-range potential as well as upon analytical evaluations, we demonstrate for any finite frequency ω that the action of an ultra-intense laser field (with electric vector F(ωt)) on a weakly bound atomic system may be described by the cycle-averaging of results for an instantaneous static electric field of strength |F(ωt)|.
Dynamic Hyperpolarizability And Two-Photon Detachment In The Presence Of A Strong Static Electric Field: Application To H-, M.V. Frolov, N.L. Manakov, Anthony F. Starace
Dynamic Hyperpolarizability And Two-Photon Detachment In The Presence Of A Strong Static Electric Field: Application To H-, M.V. Frolov, N.L. Manakov, Anthony F. Starace
Anthony F. Starace Publications
Our recent analysis [J. Phys. B 33, R141 (2000)] of the problem of H- in both laser and strong static electric fields, which treated effects that are linear in the laser intensity l (e.g., the dynamic polarizability and the single-photon detachment cross section), is extended here to treat effects of higher order (∼l2) in the laser intensity (e.g., the dynamic hyperpolarizability, the two-photon detachment cross section, the linear in l corrections to the single-photon detachment rate, etc). We introduce the concept of the dynamic hyperpolarizability of an atom in the presence of a strong electric field …
Angular Distributions For Double Ionization Of Li- By An Ultrashort, Intense Laser Pulse, G. Lagmago Kamta, Anthony F. Starace
Angular Distributions For Double Ionization Of Li- By An Ultrashort, Intense Laser Pulse, G. Lagmago Kamta, Anthony F. Starace
Anthony F. Starace Publications
We predict photoelectron angular distributions for double ionization of Li- by both weak and intense ultrashort, linearly polarized laser pulses by direct numerical integration of the three-dimensional, time-dependent Schrödinger equation. Li- is treated as a two-active electron system. Near threshold, for low intensity we recover general features of angular distributions for one-photon double ionization. For the intense field (multiphoton) case, the photoelectron angular distribution changes significantly, particularly in directions parallel and perpendicular to the laser polarization axis.
Quasistationary Stabilization Of The Decay Of A Weakly-Bound Level And Its Breakdown In A Strong Laser Field, N. L. Manakov, M. V. Frolov, Bogdan Borca, Anthony F. Starace
Quasistationary Stabilization Of The Decay Of A Weakly-Bound Level And Its Breakdown In A Strong Laser Field, N. L. Manakov, M. V. Frolov, Bogdan Borca, Anthony F. Starace
Anthony F. Starace Publications
Although it was pointed out about 10 years ago that an atomic decay rate might decrease as the intensity of a high-frequency laser field increases, there still does not exist any complete understanding of either the physical origin of this interesting nonlinear phenomenon or its dependence on the atomic and field parameters. Essentially, the problem consists in that the phenomenon requires a major modification of the standard picture of photoeffect in a strong laser field. In Reference #1 the origin of this stabilization is related to a particular distortion of an atomic potential by an intense monochromatic high-frequency field. This …
Anisotropy-Induced Polarization Effects In Harmonic Generation By An Absorptive Medium, Bogdan Borca, D. B. Milosević, Anthony F. Starace, A. V. Flegel, M. V. Frolov, N. L. Manakov
Anisotropy-Induced Polarization Effects In Harmonic Generation By An Absorptive Medium, Bogdan Borca, D. B. Milosević, Anthony F. Starace, A. V. Flegel, M. V. Frolov, N. L. Manakov
Anthony F. Starace Publications
High-order harmonic generation (HHG) has become a main topic of intense laser-atom physics. Both to understand the HHG process better and to enhance its use in applications, many studies have focused on the control of HHG. Among the most recent are those concerned with the polarization characteristics of the harmonics. Other studies have focused on the use of a strong static electric field to control the intensities and plateau structure of HHG. In this paper we present results of a general formulation of the problem of HHG in the case when the generating medium is anisotropic. Our specific results are …