Abstract
The first observation of yttrium monocarbide, YC, is reported. A number of vibronic bands have been observed in the 635–650 nm region. Four of these bands have been investigated at a resolution of 120 MHz, and rotational constants have been derived. The bands originate from a common lower Ω = 5 2 state which, on the basis of recent ab initio calculations [Shim, Pelino and Gingerich, J. Cheni. Phys. 97 (1992) 9240], is the lowest lying spin-orbit component of the ground 4Π i state. This state arises from a ⋯10σ 211σ 112σ 15π 3 electron configuration. The nature of the excited states is also discussed.
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