2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/165939We model combined photoassociation and Feshbach resonances in a Bose-Einstein condensate. When the magnetic field is far-off resonance, cross coupling between the two target molecules--enabled by the shared dissociation continuum--leads to an anomalous dispersive shift in the position of laser resonance, as well as unprecedented elimination and enhancement of resonant photoassociation via quantum interference. For off-resonant lasers, a dispersive shift and quantum interference appear similarly in resonant three-body Feshbach losses, except that the Feshbach node is tunable with intensity.4 pages, 2 figs, 22+ refs; v2 improved abstract, refined discussion of exptl motivation, improved word choice in discussion of future work; to appear in Phys. Rev. LettAtomic PhysicsChemical Physicstext