  We propose an experimentally realizable scheme to produce triatomic
ultralong-range Rydberg molecules (TURM), formed in ultracold KRb traps. A near
resonant coupling of the non-zero quantum defect Rydberg levels with the KRb
molecule in N=0 and N=2 rotational levels, is engineered which exploits the
unique Rydberg electron-molecule anisotropic dipole interaction. This near
resonant coupling enhances the TURM binding and produces favorable
Franck-Condon factors. Schemes for both postassium and rubidium excitations are
demonstrated.
