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- W1993138234 abstract "Measurements of multiple rotational lines in the (1, 0) band of the A2Πi − X2Σ+ “red” system of the cyanogen radical (CN) at sub-Doppler resolution are reported. The CN radical was produced by 193 nm photodissociation of NCCN (ethane dinitrile) and detected with a Ti:sapphire ring laser operating near 10 900 cm−1. The sample was exposed to a weak, frequency-modulated probe beam and a strong, counterpropagating bleach laser beam. Demodulated probe laser signals display absorption and dispersion features derived from Doppler-free saturation of the hyperfine components as the laser scans across the central region of a Doppler-broadened rotational line spectrum. Hyperfine-resolved transition frequencies were combined with known ground-state X2Σ hyperfine term values to determine A2Π state hyperfine term values, which were analyzed in terms of an effective Hamiltonian for the A2Π state. All the expected hyperfine and 14N quadrupolar parameters were determined and their values analyzed in terms of a simple molecular orbital picture of the bonding in the radical. Higher sensitivity obtained with 400 kHz amplitude modulation of the bleach laser and additional phase-sensitive detection allowed hyperfine splittings in some rotational lines of 13C14N to be observed in natural abundance. Excited state hyperfine splittings were determined for a selection of rotational states, but not enough to determine the 13C hyperfine parameters." @default.
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- W1993138234 date "2009-02-01" @default.
- W1993138234 modified "2023-09-26" @default.
- W1993138234 title "Sub-Doppler laser absorption spectroscopy of the A2Πi−X2Σ+ (1,0) band of CN: Measurement of the 14N hyperfine parameters in A2Π CN" @default.
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- W1993138234 doi "https://doi.org/10.1016/j.jms.2008.11.003" @default.
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