2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/101392We demonstrate that an effect other than anharmonicity can severely distort the spectroscopic signatures of quantum mechanical systems. This is done through an analytic calculation of the spectroscopic response of a simple system, a charged torsional pendulum. One may look for these effects in the optical data of real systems when for example a significant rocking component of rigid polyhedra plays a significant role in the lattice dynamics.13 pages (preprint format), 4 FiguresPhysics EducationOpticstext