Titre :

Oscillatory regimes of Langmuir probe current in femtosecond laser-produced plasmas: Experimental and theoretical investigations

Auteur(s) :

Nica, P. [Auteur]
"Gheorghe Asachi" Technical University of Iasi [TUIASI]
Gurlui, S. [Auteur]
Alexandru Ioan Cuza University of Iași = Universitatea Alexandru Ioan Cuza din Iași [UAIC]
Agop, M. [Auteur]
"Gheorghe Asachi" Technical University of Iasi [TUIASI]
Focsa, Cristian [Auteur]
Laboratoire de Physique des Lasers, Atomes et Molécules - UMR 8523 [PhLAM]
Physique Moléculaire aux Interfaces [PMI]

Titre de la revue :

Applied Surface Science

Pagination :

125-132

Éditeur :

Elsevier

Date de publication :

2019

ISSN :

0169-4332

Discipline(s) HAL :

Physique [physics]/Physique [physics]/Physique des plasmas [physics.plasm-ph]

Résumé en anglais : [en]

We investigate the oscillatory regimes of the Langmuir probe current recorded for the electrical characterization of femtosecond laser-produced plasma. The influence of metallic target biasing, which can perturb the ambipolar ...
Lire la suite >We investigate the oscillatory regimes of the Langmuir probe current recorded for the electrical characterization of femtosecond laser-produced plasma. The influence of metallic target biasing, which can perturb the ambipolar electric field generated through the charge separation at early stages of the expansion, is also studied. Two distinct behaviors are evidenced, and they point to the existence of two plasma structures: a fast one consisting in promptly ejected highly charged particles, and a slow “tail” of thermalized particles. Theoretically, a non-differentiable model which involves two scale resolutions is developed. Assuming the principle of scale resolution superposition, the current density at global scale is expressed as the sum of the current density at Coulomb and the thermal scale resolutions, in agreement with the experimental data. Interestingly, the theoretical estimation of oscillation frequencies shows a correspondence with the filling factor hierarchy in the fractional quantum Hall effect.Lire moins >

Langue :

Anglais

Vulgarisation :

Non

Collections :

• Laboratoire de Physique des Lasers, Atomes et Molécules (PhLAM) - UMR 8523

Source :

Harvested from HAL