Fourier transform emission spectroscopy: The B 4Σ−–X 4Σ− transition of BC

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Abstract
The gas‐phase emission spectrum of BC was recorded using a high resolution Fourier transform spectrometer. The BC radical was produced by sputtering in a composite‐wall hollow cathode discharge lamp. The Δv=0 vibrational sequence of the B 4Σ−– X 4Σ− transition near 5590 Å was rotationally analyzed. A set of spectroscopic constants were derived for the 0–0, 1–1, 2–2, and 3–3 vibrational bands, including re =1.491 16(34) Å for the X 4Σ− state and re =1.460 23(29) Å for the B 4Σ− state.