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Communication dans un congrès

Nonlinear properties and collisional spectra in hydrogen-(heavy) noble-gas-atom mixtures

Abstract :

In a series of previously published works the phenomenon of collision induced
nonlinear hyper-Rayleigh scattering of light (CIHRS) was studied on the basis of the numerical
quantum chemistry (QC) methods confronted with a theoretical approach. A class of super-
molecular systems composed of hydrogen (H 2 ) and lighter inert gas atoms (Rg) was considered.
In this report a development of this research work is presented with more massive and highly
polarizable, Kr and Xe, perturbers involved. The collision-induced hyperpolarizability tensorial
values, Δβ obtained by means of the QC ab initio methods are applied in order to produce
the CIHRS spectral distributions; the influence of Δβ features on the line shapes is compared
with the earlier theoretical predictions. Namely, the validity of the multipole-induced-multipole
(MIM) mechanism is assessed. In particular, its relevance to reproduce long-range functional
behavior of the so-called symmetry adapted (SA) components of the hyperpolarizability tensor
Δβ(R) is discussed. A thorough analysis of the translational CIHRS spectra is then performed
to identify the role of the hyperpolarizability spatial distribution in forming particular sections
of the line shapes. An extension of the dipole-induced-quadrupole analytical model is suggested
and tested with regard to its ability to reproduce more accurate profiles.

Type de document :
Communication dans un congrès
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https://hal.univ-angers.fr/hal-03208328
Contributeur : Okina Université d'Angers <>
Soumis le : lundi 26 avril 2021 - 14:39:00
Dernière modification le : mardi 27 avril 2021 - 03:30:41

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Waldemar Głaz, Tadeusz Bancewicz, George Maroulis, Anastasios Haskopoulos, Jean-Luc Godet. Nonlinear properties and collisional spectra in hydrogen-(heavy) noble-gas-atom mixtures. XXI International Conference on Spectral Line Shapes (ICSLS 2012), 2012, Bristol, United Kingdom. pp.012044, ⟨10.1088/1742-6596/397/1/012044⟩. ⟨hal-03208328⟩

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