2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87458The highly excited stretching vibrational energy levels and the intensities of infrared transitions in tetrahedral molecules are studied in a U(2) algebraic model. Its applications to silane and silicon tetrafluoride are presented with smaller standard deviations than those of other models.Revtex, 6 pages, no figure, to appear in Int. J. Theor. PhysChemical Physicstext