Benny's paper has just been accepted for publication on ChemPhysChem. This is the link to the paper. In this work, we comprehensively examined the profiles of adiabat-to-diabat transformation angle of circular trajectories in 2-dimensional space within the seam space of vibrational degrees of freedom. There are two types of profiles, the Renner-Teller-type and the pseudo-Jahn-Teller-type. So, Renner-Teller-type problems exist not only for linear or tetragonally symmetric systems. Seen below is the TOC graphic of the paper. It shows that when a trajectory grazes a tangential touching, the adiabat-to-diabat angle undergoes a sharp zigzag variation. This is in contrast to the sharp monotonic increase or decrease when a trajectory grazes a conical intersection.

Benny is a co-supervised student in our group. He is from Professor Marcel Nooijen's group at the University of Waterloo. This work is a collaboration between the Nooijen group and us.