Relaxation of 6 2P3/2 metastable and 6 2P1/2 ground state atomic thallium produced in the photodissociation of thallium halide vapors at high densities

D. A. Scott*, J. A. Piper

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Decay rates of the 6 2P3/2 metastable and 6 2P1/2 ground state atomic thallium densities produced in UV photodissociation (at λ 193, 222, 249, 308, and 353 nm) of TlI, TlBr, and TlCl molecular vapors have been measured for vapor densities from 10 13 to 1017 cm-3. Dominant relaxation processes have been identified as (i) for the metastable state, collisional deexcitation by thallium halide molecules at high halide densities (≥1015 cm-3) and by free halogens and trace impurities at lower halide densities and (ii) for the ground state, diffusion in the ambient (argon/thallium halide) gas at high halide densities and volume reassociation under certain conditions at low halide densities. Cross sections and diffusion coefficients are evaluated.

Original languageEnglish
Pages (from-to)6504-6509
Number of pages6
JournalThe Journal of Chemical Physics
Volume85
Issue number11
DOIs
Publication statusPublished - 1986

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