2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/210992Recently a new time-evolution picture of the Dirac quantum mechanics was defined in charts with spatially flat Robertson-Walker metrics, under the name of Schrödinger picture [I. I. Cotăescu, arXiv:0708.0734] . In the present paper new Dirac quantum modes are found in moving charts of the de Sitter spacetime using the technical advantages offered by this picture. The principal result is a new set of energy eigenspinors which behave as polarized plane waves and form a complete system of orthonormalized solutions of the free Dirac equation.15 pages, no figuresGeneral Relativity and Quantum Cosmologytext