Laser photolysis of ICl. A time-resolved LMR measurement of Cl(2P 1 2) relative yield

T. S. Mashnin, A. V. Chernyshev, L. N. Krasnoperov

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Abstract

Tunable dye laser-pulsed photolysis combined with time-resolved laser magnetic resonance spectroscopy was used to probe Cl atoms after photodissociation of iodine monochloride (IC1) molecules. The 2P 1 2 (F′, M′ = 2, 2) ← 2P 3 2 (F′, M′′ = 3, 3) transition between Zeeman sublevels of the fine structure levels of Cl atoms was used to measure the relative yield of excited chlorine atoms β = [Cl(2P 1 2)]0/ ([Cl(2P 3 2)]0 + [Cl(2P 1 2)]0) following IC1 photolysis within the wavelength range 437 < λ < 532 nm and at λ = 266 nm. The maximum relative yield of excited Cl atoms (0.79 ± 0.03) was measured at λ = 480 ± 0.5 nm. At λ = 266 nm the relative yield was 0.65 ± 0.06. These experimental data combined with measured relative yields of Cl(2P 1 2) in the dissociation from the B 3Π0+ state were used to decompose the visible absorption spectrum into two components. The extinction coefficient is represented as the sum of two Gaussian components: ε{lunate}1 max = 105.8 ± - 1 ℓ mol-1 cm-1' ε{lunate}2 max = 63 ± 2 mol-1 cm-1; v01 = 21070 ± 13 cm-1; v02 = 24077 ± 27 cm-1; Δv1 = 1901 ± 18 cm-1; Δv2 = 2087 ± 49 cm-1 (1 and 2 refer to the transitions B 3Π0+ ← X 1Σ0+ and 1Π ← X 1Σ0+, respectively, T = 298 K). The main absorption is due to the transition B 3Π0+ ← X 1Σ0+.

Original languageEnglish (US)
Pages (from-to)105-109
Number of pages5
JournalChemical Physics Letters
Volume207
Issue number1
DOIs
StatePublished - May 14 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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