Nobel prize to E. Schrödinger awarded in 1933. Co-winner P. A. M. Dirac "for the discovery of new productive forms of atomic theory''

SCHRÖDINGER 1926

Schrödinger, E.; Quantizierung als Eigenwertproblem (Erste Mitteilung) / Quantization as a Problem of Proper Values. Part I.
Annalen der Physik. Leipzig 79 (1926) 361;

Reprinted in
(translation into English) Collected papers on wave mechanics by E. Schrödinger, Glasgow (1928) 1.
Abhandlungen zur Wellenmechanik, Schrödinger (1927d) 1.
Gesammelte Abhandlungen / Collected Works, E.Schrödinger (1984c) 82.

Motivation
In this paper I wish to consider, first, the simple case of the hydrogen atom (non-relativistic and unperturbed), and show that the customary quantum conditions can be replaced by another postulate, in which the notion of "whole numbers'', merely as such, is not introduced. Rather when integralness does appear, it arises in the same natural way as it does in the case of the node-numbers of a vibrating string. The new conception is capable of generalization, and strikes, I believe, very
deeply at the true nature of the quantum rules. (Extracted from the introductory part of the paper.).

Related references More (earlier) information appears in E. Schrödinger, Phys.Zeitschr. 27 (1926) 95;
See also A. Sommerfeld, Atombau und Spectrallinien 4th ed. 775;
L. de Broglie, Ann. de Physique 3 (1925) 22;

Record comments
Creation of wave mechanics. Invention of the Schrödinger wave equation.