Experimental proof of strong $\Pi$-$\Sigma$ mixing in the Renner-Teller and Pseudo-Jahn-Teller affected CCH${}^{+}$ (${}^3\Pi$) ion

Kim Steenbakkers, P. Bryan Changala, Weslley G. D. P. Silva +8

The ethynyl radical cation, CCH${}^{+}$ (${}^3\Pi$), offers a unique system for fundamental spectroscopic studies of non-adiabatic effects due to its open-shell linear structure and the pr…