Abstract
The mass-resolved, one-color, 2+1 resonance-enhanced multiphoton ionization (REMPI) spectrum of the BF radical between 304 and 337 nm is reported and rotationally analyzed. The B 1∑+ (3s)←←X 1∑+ origin is observed to have a strong Q branch and much weaker O and S branches. Since they are forbidden in one photon, these rotational branches have not been previously observed. This is the first REMPI study of any boron-containing radical. We find that 2+1 REMPI is a convenient method for the detection of boron monofluoride, having sensitivity better than 108 cm−3.
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