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The precise measurement of molecular vibrational transition frequencies isuseful in the search for variation in the proton-to-electron mass ratio {\mu}.Homonuclear diatomic molecules are particularly advantageous for precisemeasurement because of the small Stark shift. This paper discusses the Starkand Zeeman shifts in the 16O2+ vibrational transition frequencies.To search forthe variation {\mu}(<10-17/yr), the X2{\Pi}1/2(v,J)=(0,1/2)-(v',1/2)(v'>1)intransition frequencies are much more advantageous than the transitionfrequencies between the X2{\Pi}1/2 v=21 and a4{\Pi}1/2 v=0 states, whosesensitivity to the variation in {\mu} is high because of the accidentaldegeneracy.

Accuracy estimation of the 16O2+ transition frequencies targeting the search for the variation in mp/me