In search for a shorter radiative lifetime, we focus on the dipole-allowed transition. As the last candidate for an OCC we consider a three-level cycle with the 1 2 Π excited state decaying to the ground 1 2 ∆ and an intermediate 1 2 Σ states. The FCFs on the 1 2 Π 1/2 → 1 2 ∆ 3/2 transition single out zirconium and scandium cations where the sum of the first four FCFs reaches 0.9999; the titanium cations also reach such saturation by adding the fifth FCF (see Section S4 in the SI). In all these cations, the excited state decays significantly (> 10 %)