In this paper we investigate the single and double ionization signals of H2 molecules, with fixed and moving nuclei, as a function of laser intensity, for two different values of laser wavelength =390 nm and =780 nm, using an approach for evaluating the ionization signals which allows the investigation of rela- tively long-lasting pulses. The He system is first investigated to benchmark our calculation against already known results. We confirm the evidence of nonsequentiality in the ionization processes of all the systems investigated. Furthermore, we show that the nuclei motion enhances the double ionization signals by means of a mechanism which is very similar to a charge-resonant enhanced ionization CREI effect Zuo and Bandrauk, Phys. Rev. A 52, R2511 1995
The time-dependent wave function of a nanoring driven by a laser field is obtained by exploiting the symmetries\ud inherent to the system and used for studying the properties of the electromagnetic radiation emitted by the\ud nanoring as a function of the polarization state of the laser. The diffused radiation has the characteristics of\ud high-order-harmonic generation. For a noncircularly polarized laser field an extension of the expected cutoff\ud position is evident, indicating that nanorings are efficient sources of radiation. The polarization state of the\ud emitted harmonics can be opportunely controlled by varying the parameters of the pump field. The profile of\ud the absorbed angular moment shows that a magnetic moment can be induced depending on the polarization of\ud the driven field
In this work we study harmonic emission from structured quantum rings (SQRs). In SQRs, electrons trapped in two-dimensional structures are further confined by an external potential composed of N scattering centers arranged on a circle. We build a suitable one-dimensional model Hamiltonian describing this class of systems and analytically solve the associated Schödinger equation. We find that the solution can be expressed in terms of Mathieu functions and focus on the specific case of N = 6. By exactly solving the time-dependent Schödinger equation, we then show how the harmonic response to linearly polarized lasers strongly depends on the ring physical parameters. The results illustrate how the additional degrees of freedom introduced by these parameters, provide important handles to control the emitted spectrum that in some cases extends into the XUV region.
Abstract:: Laurel woodlands in the Madonie mountains (Sicily) are characterized by the presence of Laurus nobilis, Rhamnus lojaconoi and Vitis vinifera subsp. sylvestris. The results of a phytosociological study are presented, and a new endemic association, Rhamno lojaconoi-Lauretum nobilis, is described. Present Mediterranean laurel communities are the result of an adaptive response by Tertiary laurel forest to the peculiar microclimatic conditions that characterize the refugia where they persist. These refugia have been recently considered as a priority habitat under the Directive 92/43/EEC, and their plant communities are very vulnerable. Protection measures of the studied laurel populations are necessary, with particular reference to the bulking up of R. lojaconoi through in situ and ex situ propagation. A multivariate analysis of 63 relevés from all the Sicilian laurel communities described so far and additional 65 relevés from all over southern Europe and the Mediterranean basin bears out the autonomy of the new association, showing at the same time some oristic afnities between Sicilian, southern Italian, Spanish and Iberian associations. Their syntaxonomic treatment is discussed.
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