Relative transition probabilities and the electronic transition moment in the A-X system of OH

Abstract Relative transition probabilities (branching ratios) for the vibrational levels v ′ = 0, 1 and 2 of the A-X system of the OH molecule have been measured using resonance fluorescence of individual rotational levels, selectively excited by a frequency doubled tunable dye laser. The results are utilized as part of the criteria in a critical assessment of previous experimental and theoretical investigations of the A-X transition probabilities, with the conclusion that a linear form of the electronic transition moment R e ( r ) best describes this system.

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