Journal•ISSN: 0953-4075

# Journal of Physics B

IOP Publishing

About: Journal of Physics B is an academic journal published by IOP Publishing. The journal publishes majorly in the area(s): Ionization & Excited state. It has an ISSN identifier of 0953-4075. Over the lifetime, 25080 publications have been published receiving 447171 citations. The journal is also known as: J. Phys. B & Journal of physics. B, Atomic, molecular, and optical physics.

Topics: Ionization, Excited state, Electron, Scattering, Ion

##### Papers published on a yearly basis

##### Papers

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TL;DR: In this article, the authors reported the observation of very high-order odd harmonics of rare gases at an intensity of about 1013 W cm-2 in the XUV range (32.2 nm).

Abstract: The authors report the observation of very-high-order odd harmonics of Nd:YAG laser radiation in rare gases at an intensity of about 1013 W cm-2. Harmonic light as high as the 33rd harmonic in the XUV range (32.2 nm) is generated in argon. The key point is that the harmonic intensity falls slowly beyond the fifth harmonic as the order increases. Finally, a UV continuum, beginning at 350 nm and extending down towards the short wavelength region is apparent in xenon.

1,240 citations

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TL;DR: In this paper, the Schrodinger equation for an atom in an electromagnetic field is solved with sufficient accuracy to obtain probabilities for multiple absorption of photons from a monochromatic laser beam of arbitrary intensity or frequency.

Abstract: Applying a space translation operation, the Schrodinger equation for an atom in an electromagnetic field is solved with sufficient accuracy to obtain probabilities for multiple absorption of photons from a monochromatic laser beam of arbitrary intensity or frequency. It is shown that the derived expression for the N-photon T-matrix contains the usual single photon matrix elements given by the perturbation theory and that the perturbative result is obtained in the limit of low intensity. Other explicit examples are considered. The conditions of applicability of the method are specified.

811 citations

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TL;DR: In this paper, the exact form of the three-body Coulomb wave function in the asymptotic region where the separation of all particles tends to infinity was derived using a modification of the method of Pluvinage (1951).

Abstract: A derivation is given of the exact form of the three-body Coulomb wavefunction in the asymptotic region where the separation of all particles tends to infinity. Using a modification of the method of Pluvinage (1951), an approximate three-body scattering wavefunction is derived that satisfies this boundary condition. Triply-differential cross sections (TDCS) for electron impact ionisation of atomic hydrogen calculated with this scattering wavefunction, which contains no free parameters, show excellent agreement with measurements at impact energies greater than 150 eV. The corresponding TDCS for positron impact ionisation are also presented.

526 citations

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TL;DR: The theoretical description and experimental methods and results for above-threshold ionization (ATI) by few-cycle pulses are reviewed in this article, where a pulse is referred to as a fewcycle pulse if its detailed shape, parametrized by its carrier-envelope phase, affects its interaction with matter.

Abstract: The theoretical description and the experimental methods and results for above-threshold ionization (ATI) by few-cycle pulses are reviewed. A pulse is referred to as a few-cycle pulse if its detailed shape, parametrized by its carrier-envelope phase, affects its interaction with matter. Angular-resolved ATI spectra are analysed with the customary strong-field approximation (SFA) as well as the numerical solution of the time-dependent Schrodinger equation (TDSE). After a general discussion of the characteristics and the description of few-cycle pulses, the behaviour of the ATI spectrum under spatial inversion is related to the shape of the laser field. The ATI spectrum both for the direct and for the rescattered electrons in the context of the SFA is evaluated by numerical integration and by the method of steepest descent (saddle-point integration), and the results are compared. The saddle-point method is modified to avoid the singularity of the dipole transition matrix element at the steepest-descent times. With the help of the saddle-point method and its classical limit, namely the simple-man model, the various features of the ATI spectrum, their behaviour under inversion, the cut-offs and the presence or absence of ATI peaks are analysed as a function of the carrier-envelope phase of the few-cycle laser field. All features observed in the spectra can be explained in terms of a few quantum orbits and their superposition. The validity of the SFA and the concept of quantum orbits are established by comparing the ATI spectra with those obtained numerically from the ab initio solution of the TDSE.

515 citations

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TL;DR: In this paper, the spectral properties of Hamilton operators perturbed by a complex absorbing potential (CAP) were studied and the errors in the calculation of complex resonance energies caused by the additional CAP and by finite basis set representation were examined.

Abstract: The spectral properties of Hamilton operators perturbed by a complex absorbing potential (CAP) are studied. For a wide class of CAPS proper eigenvalues of the perturbed Hamilton operator converge to Siegert resonance eigenvalues of the unperturbed Hamiltonian with decreasing CAP strength. The errors in the calculation of complex resonance energies caused by the additional CAP and by finite basis set representation are examined. In order to minimize these errors a scheme of approximations is provided. The application of this method allows for the use of real L2 basis sets. The feasibility and accuracy of the proposed method is demonstrated by calculations of resonance energies of a model potential and of the 2 Pi g shape resonance of N2.

490 citations