A photodetachment experiment is performed on the v=0→v=0OH detachment threshold. The weak O and S branches provide a signal strong enough to make amplitude measurements on all five O,P,Q,R, and S branches possible, which are used to fix the formulas for their relative intensities. Photodetachment microscopy is applied to 15 different thresholds of the P,Q, and R branches. The quantitative analysis of the interference patterns obtained does not show any effect of the dipole moment of OH, but yields a new measurement of the rotational parameters of OH(v=0) and of the electron affinity of the molecule. The new recommended value for the electron affinity of O116H is 14 740.982(7) cm−1 or 1.827 648 7(11) eV.

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