Time resolved transient absorption probing of a laser plasma II

During the last two decades dense rare gases have attracted a great number of workers due to their potentiality as laser media. In this respect a detailed knowledge of plasma kinetics is of great importance. A recent study of kinetics and decay processes in argon has shown that the 4s atomic levels act as decay steps. The present communication reports on a method allowing the kinetic study of an argon plasma by transient visible absorption spectroscopy from the frrst 4s-level manifold. The plasma is created by focusing a pulsed YAG laser in argon at variable pressure, typically in the atmospheric range. The probe beam is obtained by irradiating with a second YAG laser a dye cell operated in the broad band regime 121. The light is analyzed with a 2.5-m Ebert spectrometer equipped with an EG&G optical multichannel analyzer (OMA).License CC-BY-NC-ND. --------- French law about open access and open science: https://www.legifrance.gouv.fr/affichTexte.do?cidTexte=JORFTEXT000033202746&categorieLien=id ----------------------- LOI n° 2016-1321 du 7 octobre 2016 pour une République numérique - Article 30