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- W2068743417 abstract "We demonstrate an application of two-color resonant four-wave mixing spectroscopy to detect highly predissociative levels of CH in the B 2Σ− state in a hostile environment of an oxyacetylene flame. The probe and grating wavelengths are in resonance with the A 2Δ–X 2Π and B 2Σ−–X 2Π systems, respectively. We measured 49 previously unobserved rovibronic lines of the 0–0 band and 38 additional lines of the 1–0 band of the B 2Σ−–X 2Π system to access rotational quantum number N′ up to 21 and 13 of v′=0 and 1 in the B 2Σ− state, respectively. Inclusion of additional line positions measured for the 0–0 and the 1–0 bands yields spectral parameters of the B 2Σ− state significantly improved over those obtained previously with only nonpredissociative lines; one additional centrifugal–distortion parameter Lv is evaluated significantly. Although power saturation is significant even at smallest practical laser energies, we estimated lifetimes through the power dependence of linewidths. The lifetimes of the highest measurable level of B 2Σ− (v′=0 and 1) are 3±1 (N′=20) and 8±2 (N′=11) ps, respectively." @default.
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- W2068743417 date "1998-09-08" @default.
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- W2068743417 title "Highly predissociative levels of CH B 2Σ− state detected with two-color resonant four-wave mixing spectroscopy" @default.
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- W2068743417 doi "https://doi.org/10.1063/1.476982" @default.
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