Spectroscopic observation of isotopic fractionation in an expanding laser induced plasma (LIP) plume

Abstract

This study investigates isotopic fractionation in laser-induced plasma using calibration-free LAMIS. Fractionation proves to be a transient early-time phenomenon linked to plasma expansion. ¹⁰B enrichment is observed at the plume periphery and later relaxes to the bulk composition. Variations across different atmospheres and laser wavelengths were also analysed, offering insights for optimizing laser-based isotopic measurements.