Long-range forces between two excited mercury atoms and associative ionization

James S. Cohen, Andrei Derevianko

The long-range quadrupole-quadrupole ($\sim R^{-5}$) and leading dispersion ($\sim R^{-6}$) interactions between all pairs of excited Hg($6s6p$) ${}^3{P}_0$, ${}^3{P}_1$, ${}^3{P}_2$, and $^1P…