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

Wim Ubachs; Gerard Meyer; J.J. ter Meulen; A. Dymanus

doi:10.1063/1.450284

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

Wim Ubachs^*, Gerard Meyer, J.J. ter Meulen, A. Dymanus

^*Corresponding author for this work

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Abstract

From a laser induced fluorescence (LIF) experiment on a molecular beam 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 ²∑⁺, υ=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 ₂∑₊ 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.

Original language	English
Pages (from-to)	3032-3041
Number of pages	10
Journal	Journal of Chemical Physics
Volume	84
Issue number	6
DOIs	https://doi.org/10.1063/1.450284
Publication status	Published - 15 Mar 1986

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title = "Hyperfine structure and lifetime of the C 2∑+, v=0 state of CH",

abstract = "From a laser induced fluorescence (LIF) experiment on a molecular beam of CH, we have obtained the b and c hyperfine constants, the γ and γD spin-rotation constants as well as accurate values for the rotational constants B, D, and H for the C 2∑+, υ=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 2∑+ 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.",

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AU - Ubachs, Wim

AU - Meyer, Gerard

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AU - Dymanus, A.

PY - 1986/3/15

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N2 - From a laser induced fluorescence (LIF) experiment on a molecular beam of CH, we have obtained the b and c hyperfine constants, the γ and γD spin-rotation constants as well as accurate values for the rotational constants B, D, and H for the C 2∑+, υ=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 2∑+ 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.

AB - From a laser induced fluorescence (LIF) experiment on a molecular beam of CH, we have obtained the b and c hyperfine constants, the γ and γD spin-rotation constants as well as accurate values for the rotational constants B, D, and H for the C 2∑+, υ=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 2∑+ 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.

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