Resonant two-photon ionization spectroscopy of NiC

Brugh, Dale J.; Morse, Michael D.
December 2002
Journal of Chemical Physics;12/15/2002, Vol. 117 Issue 23, p10703
Academic Journal
A spectroscopic investigation of jet-cooled diatomic NiC has revealed a complex pattern of vibronic levels in the wave number range from 21 700 to 27 000 cm[sup -1]. Of the more than 50 vibronic bands observed, 31 have been rotationally resolved and analyzed. All are Ω' = 0[sup +] ← Ω' = 0[sup +] transitions, consistent with the calculated ¹Σ[sup +] ground state of this molecule. Through the observation of vibrational hot bands in the spectra, these measurements have established that ω'[sub e] = 875.155 cm[sup -1], ω[sub e]x[sub e]=5.38 cm[sup -1], B[sub e] = 0.640 38(14) cm[sup -1], α[sub e] = 0.004 44(36) cm[sup -1], and r[sub e] = 1.6273(2) Å for [sup 58]Ni[sup 12]C. Several possible electronic band systems are observed, but the identification of these is hampered by extensive perturbations among the excited states. The observation of long-lived vibronic states as far to the blue as 26 951 cm[sup -1] indicates that D[sub 0](NiC) ≥3.34 eV, and the ionization energy of NiC has been determined to fall in the range IE(NiC) = 8.73 ± 0.39 eV. A discussion of these results, in the context of work on other 3 d transition metal carbides is also presented.


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