Molecular constants and term values for the hydroxyl radical, OH: The X2Π ( v = 8, 12), A2Σ + ( v = 4–9), B2Σ + ( v = 0, 1), and C2Σ + ( v = 0, 1) states

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Line position data obtained recently for the OH X 2Π (12, 8) vibration-rotation band and the B ← X (0, 12) transition are employed in a least-squares analysis to provide the first molecular parameters for the X ( v = 12) level. The molecular parameters are estimated using a procedure in which these data are fitted simultaneously in combination with other recent data for the A ← X (4, 2) transition and older data for bands of the C → A and B → A systems. The X ( v = 12)Λ-doubling parameters are in excellent agreement with ab initio results. A table of term values is presented for the X 2Π ( v = 8, 12), A 2Σ + ( v = 4–9), B 2Σ + ( v = 0, 1), and C 2Σ + ( v = 0, 1) levels.