Energy Transfer in the 2u (1D2) Ion-Pair State of I2 by Inelastic Collisions with Noble Gas Atoms

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Abstract

We investigated the energy transfer in the 2u (1D2) ion-pair state of I2 by collision with noble gas atoms, Ar, Kr, and Xe, using an optical–optical double resonance/fluorescence detection technique. By analyzing the temporal profiles of the emission from the laser-excited 2u (1D2) state at various noble gas pressures, the quenching rate constants Formula Presented were determined to be (4.55 ± 0.42) × 10–10, (4.23 ± 0.11) × 10–10, and (6.83 ± 0.16) × 10–10 cm3 molecule–1 s–1 for quenching by Ar, Kr, and Xe, respectively. The 2g (1D2) ion-pair state, lying in the vicinity of the 2u (1D2) state, was identified as a destination state by collision with Ar and Kr. Collision with Xe provided a new reactive pathway forming the excimer XeI(B). The rate constants were determined to be Formula Presented = (9.61 ± 0.63) × 10–11 cm3 molecule–1 s–1 and Formula Presented = (4.87 ± 0.34) × 10–11 cm3 molecule–1 s–1 for the formation of the 2g (1D2) state by collision with Ar and Kr, respectively, and Formula Presented = (6.55 ± 0.19) × 10–11 cm3 molecule–1 s–1 for the formation of XeI(B). The collisional cross sections calculated from the quenching rate constants were considerably larger than the molecular size, owing to the harpoon mechanism.

Original languageEnglish
Pages (from-to)3605-3612
Number of pages8
JournalACS Omega
Volume7
Issue number4
DOIs
Publication statusPublished - 1 Feb 2022

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