Abstract
We present limited results concerning the largest anticrossing (≈ 0.5 T, fwhm) observed in the series of anticrossing spectra à 1Au ν′3 = 0–3, K′ = N′= I′ = 0 in the gaseous acetylene molecule (C2H2). By analyzing the fluorescence 7.15 T, we deduce the anticrossing parameters in a two-level model. The Landé g factor shows this anticrossing results from a large coupling of a S1 (Ã) level with a zeroth-order triplet level. This agrees well with our previous hypothesis of the existence of a triplet linear isomerization barrier in the vicinity of the energy range studied (≈ 45500 cm−1).
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