Hyperfine structure and lifetime of the C 2Σ+, v=0 state of CH

Ubachs, Wim; Meijer, Gerard; Meulen, J. J. ter; Dymanus, A.

doi:/10.1063/1.450284

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Hyperfine structure and lifetime of the C ²Σ⁺, v=0 state of CH

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Ubachs, W., Meijer, G., Meulen, J. J. t., & Dymanus, A. (1986). Hyperfine structure and lifetime of the C ²Σ⁺, v=0 state of CH. The Journal of Chemical Physics, 84(6), 3032-3041. doi:/10.1063/1.450284.

Cite as: https://hdl.handle.net/21.11116/0000-000C-2296-4

Abstract

From a laser induced fluorescence (LIF) experiment on a molecularbeam of CH, we have obtained the b and c hyperfine constants, the γ and γ_D spin‐rotation constants as well as accurate values for the rotational constants B, D, and H for the C ²Σ⁺, v=0 state. From measurements of the linewidths, that are partially caused by predissociation, and by comparing relative line intensities, we determined different lifetimes for upper (F₁) and lower (F₂) ρ‐doublet states of the C ²Σ⁺ state. For the F₁ states we find a constant lifetime of 3.7±1.0 ns, that is independent of N, while for the F₂ states we observed an increase in lifetime for higher N up to 8.0±1.5 ns for N=11.