Publication
Journal of Applied Physics
Paper

Temperature of molecular vapor in laser ablation of CuCl

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Abstract

Optical emission spectra are studied from the vapor produced by irradiation of polycrystalline CuCl, under vacuum, by pulsed excimer laser radiation at 248 and 308 nm. For fluences φ≲0.4 J/cm2 (intensity I≲20 MW/cm2), well-resolved molecular CuCl emission bands and weak atomic Cu lines are observed. At higher fluences, the CuCl emission increases and develops into a broad continuum due to the broadening and overlap of the bands, whereas the Cu atomic line emission increases more rapidly. At even higher fluences (φ≳1 J/cm2, I≳50 MW/cm2), the Cu atomic emission dominates the entire spectrum. A thermal equilibrium model is used to calculate the vibrational-rotational temperature of the emitting CuCl molecules as a function of fluence by fitting the experimentally observed emission bands. Temperatures in the range 500<T<2000 K for fluences in the range 0.27<φ<0.4 J/cm2 were obtained.

Date

01 Dec 1985

Publication

Journal of Applied Physics

Authors

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