  It is known that the nonstrictly thermal character of the Hawking radiation
spectrum harmonizes Hawking radiation with black hole (BH) quasi-normal modes
(QNM). This paramount issue has been recently analyzed in the framework of both
Schwarzschild BHs (SBH) and Kerr BHs (KBH). In this assignment, we generalize
the analysis to the framework of nonextremal Reissner-Nordstr\"{o}m BHs (RNBH).
Such a generalization is important because in both SBHs and KBHs an absorbed
(or emitted) particle has only mass. Instead, in RNBHs the particle has charge
as well as mass. In doing so, we expose that for the RNBH, QNMs can be
naturally interpreted in terms of quantum levels for both particle emission and
absorption. Conjointly, we generalize some concepts concerning the RNBH's
"effective states".
