Strong Evidence of Plasma-like Behavior for Ion-Solid Collisions

TL;DR

This study reveals plasma-like behavior in ion-solid collisions by analyzing charge state distributions in thin carbon foils, showing Lorentzian profiles indicative of tenuous plasma formation.

Contribution

It demonstrates that ion-solid collisions produce plasma characteristics in the bulk, confirmed through x-ray spectroscopy and theoretical approaches.

Findings

Charge state distributions exhibit Lorentzian profiles.

Ion-solid collisions form tenuous plasma in the bulk.

Surface and bulk charge states can be distinguished.

Abstract

Charge state distributions of various projectile ions passing through thin carbon foils have been studied in the energy range of 0.7-3.0 MeV/u using x-ray spectroscopy. This technique is found to be appropriate to segregate the charge state distribution in the bulk from that of the surface by measuring the charge changing phenomena right at the interaction zone i.e. at t=0. This observation has been confirmed by different theoretical approaches. Surprisingly, it is found that the charge state distribution measured in the bulk, exhibits Lorentzian profile which is an important characteristic of any plasma. The occurrence of such behaviour suggests that ion-solid collisions constitute tenuous plasma in the bulk of the solid target. Thus, this work is expected to have practical implications in various fields, in particular, plasma physics and astrophysics.