Spin-Forbidden Decay of the Dication HS2(+)

摘要

The lifetimes of the low-lying vibrational levels of the X2 II state of therecently identified dication HS2(+) are considered. The stability of this state is attributable to a barrier formed from the avoided crossing of (2) II states asymptotically characterized as H(+) + S(+) and H + S2(+). As a result of this barrier, the nonrelativistic X2 II potential energy curve supports several quasibound vibrational levels that are long lived with respect to tunneling. However, this is not the principal decay mechanism.