Abstract
Using a Ramsey-type setup, the lambda-doublet transition in the J=1,Ω=1 level of the a3Πstate of CO was measured to be 394064870(10)Hz. In a molecular beam apparatus, a beam of metastable CO is prepared in a single quantum level by expanding CO into vacuum and exciting the molecules using a narrow-band UV laser system. After passing two microwave zones that are separated by 50cm, the molecules are state-selectively deflected and detected 1 meter downstream on a position sensitive detector. In order to keep the molecules in a single mJB level, a magnetic bias field is applied. We find the field-free transition frequency by taking the average of the mJB=+1→mJB=+1 and mJB=-1→mJB=-1 transitions, which have an almost equal but opposite Zeeman shift. The accuracy of this proof-of-principle experiment is a factor of 100 more accurate than the previous best value obtained for this transition.
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