Laser-induced transitions between triply excited hollow states

Using complex scaling and a correlated basis constructed in terms of B splines, we calculate the ${\mathrm{Li}}^{+}$ photoion yield in the presence of a laser-induced coupling between the triply excited ${2s}^2{2p(}^2{P}^o)$ and ${2s2p}^2{(}^2{D}^e)$ resonances in lithium, the first of which is assumed to be excited by synchrotron radiation from the ground state. The laser coupling between the triply excited states is shown to lead to a significant and readily measurable modification of the line profile which provides a unique probe of the dipole strength between highly correlated triply excited states. We also present results for some higher-lying triply excited states of ${}^2{P}^o$ symmetry.