Abstract
The (0,0) vibronic band of NiCl system H near 12 259 cm−1 was recorded at high resolution in absorption using intracavity laser spectroscopy (ILS) and in emission by Fourier transform (FT) spectroscopy. Though it was originally assigned in 1962 as the (1,1) vibronic band of 2Π3/2–X2Δ5/2, we have shown that this transition is the (0,0) vibronic band associated with a newly identified 2Σ+ excited state and the X2Π3/2 ground state. The molecular constants for the new 2Σ+ electronic state were derived from the rotational analysis. For the ILS absorption spectra, the NiCl molecules were produced in a nickel hollow cathode, operated with a small amount of CCl4. Line positions were referenced to iodine spectra observed from a heated extracavity cell using the intracavity laser as the light source. For the FT spectra, excited NiCl molecules were produced in a King-type carbon tube furnace.
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