The TaO+ molecular ion is proposed as a candidate system for detecting
signatures of charge parity (CP) violating physics beyond the
standard model of elementary particles. The electron electric dipole moment
(EDM) effective electric field Eeff​=20.2[cmGV​], the nucleon-electron scalar-pseudoscalar (ne-SPS) interaction
constant WS​=17.7 [kHz] and the nuclear magnetic quadrupole interaction
constant WM​=0.45 [ecm21033Hz​] are
found to be sizeable P,T-odd enhancements. The ratio of the leptonic
and semi-leptonic enhancements differs strongly from the one for the ThO system
which may provide improved limits on the electron EDM, de​, and the SPS
coupling constant, CS​. TaO+ is found to have a 3Δ1​ electronic
ground state like the previously proposed ThF+ molecular ion, but an order
of magnitude smaller parallel G-tensor component which makes it less vulnerable
to systematic errors in experiment.Comment: 9 pages, 1 figur