2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/93951A systematic method for calculating higher-order corrections of the relativistic semiclassical fixed-energy amplitude is given. The central scheme in computing corrections of all orders is related to a time ordering operation of an operator involving the Van Vleck determinant. This study provides us a new viewpoint for quantization.8 pages, ReVTeX, no figuresQuantum Physicstext