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The Stark deceleration of OH radicals in both low-field-seeking andhigh-field-seeking levels of the rovibronic ${}^2\Pi_{3/2},v=0,J=3/2$ groundstate is demonstrated using a single experimental setup. Applyingalternating-gradient focusing, OH radicals in their low-field-seeking${}^2\Pi_{3/2},v=0,J=3/2,f$ state have been decelerated from 345 m/s to 239m/s, removing 50 % of the kinetic energy using only 27 deceleration stages. Thealternating-gradient decelerator allows to independently control longitudinaland transverse manipulation of the molecules. Optimized high-voltage switchingsequences for the alternating-gradient deceleration are applied, in order toadjust the dynamic focusing strength in every deceleration stage to thechanging velocity over the deceleration process. In addition we have alsodecelerated OH radicals in their high-field-seeking ${}^2\Pi_{3/2},v=0,J=3/2,e$state from 355 m/s to 316 m/s. For the states involved, a real crossing ofhyperfine levels occurs at 640 V/cm, which is examined by varying a biasvoltage applied to the electrodes.

Stark deceleration of OH radicals in low-field-seeking and high-field-seeking quantum states