Plasmon resonance in warm dense matter

Abstract

Collective Thomson scattering with extreme ultraviolet light or x rays is shown to allow for a robust measurement of the free electron density in dense plasmas. Collective excitations like plasmons appear as maxima in the scattering signal. Their frequency position can directly be related to the free electron density. The range of applicability of the standard Gross-Bohm dispersion relation and of an improved dispersion relation in comparison to calculations based on the dielectric function in random phase approximation is investigated. More important, this well-established treatment of Thomson scattering on free electrons is generalized in the Born-Mermin approximation by including collisions. We show that, in the transition region from collective to noncollective scattering, the consideration of collisions is important.

Ion potential in warm dense matter: Wake effects due to streaming degenerate electrons

“…For example, Ref. [39] contains results for warm dense matter conditions in static Born approximation (see also references cited therein). At low densities (r s ∼ 1.5), the results substantially exceed the predictions of the analytical parametrization, Eq.…”

Influence of local-field corrections on Thomson scattering in collision-dominated two-component plasmas

“…Collisions as well as correlations modify these RPA dispersion relations leading to a shift and a broadening of the plasmon even at k < k 0 (r s ). For the conditions of warm dense matter, the plasmon dispersion in the traditional Born-Mermin approach has been studied by Thiele et al [4]. …”

“…It is well-known, see [2,3,4], that the experimental Thomson scattering cross section is related to the dynamic structure factor of all electrons in the plasma according to…”

“…Recently, Thomson scattering has been established as a diagnostic tool for high energy laser-matter interaction in particular for warm dense matter [1,2,3,4]. The Thomson signal probes the dynamic structure factor of the plasma [5].…”

Продольная Электрическая Проводимость В Квантовой Плазме С Переменной Частотой Столкновений В Рамках Подхода Мермина

“…В статье [26] диэлектрическая функция Мермина обобщается на случай двухкомпонентной плаз-мы. В работе [27] показано, что рассмотрение томпсоновского рассеяния свободных электронов является обобщением аппроксимации Борна-Мермина путем включения столкновений. В работе [28] диэлектрическая функция вычисляется в случае, когда частота столкновений зависит от частоты колебаний электромагнитного поля.…”