# Compositional analysis of laser produced plasma plume in front and back ablation geometries

## TL;DR

This study compares the plasma composition in front and back ablation geometries of LiF-C thin films under vacuum and argon, analyzing ionic and neutral contributions and their evolution over time.

## Contribution

It provides a detailed compositional analysis of laser-produced plasma in different ablation geometries, using novel approaches to estimate neutral abundance and ionic/neutral ratios.

## Key findings

- Ionic to neutral ratio varies with geometry and ambient conditions.
- Neutral abundance estimated using ADAS and LTE-based intensity ratios.
- Plasma composition evolution insights applicable to laser processing techniques.

## Abstract

Composition analysis of LiF-C thin film for neutral and ionic contributions in Front Ablation (FA) and Back Ablation (BA) geometries in vacuum and 2\times10-1 mbar argon has been done. Temporal evolution of ionic to neutral ratio and neutral abundance for both the geometries has been estimated. For neutral abundance, two approaches viz Atomic Data and Analysis Structure (ADAS) analysis as well as integrated intensity ratio of Li I 670.1 nm and Li I 610.3 nm lines assuming LTE conditions are explored. The present attempt will be interesting from the view point of understanding the evolution of plasma composition in various geometries/configurations of laser ablation which has important implications in various applications e.g. pulsed laser deposition and laser cleaning.