BORN, M. (+) V. A. FOCK.

Beweis des Adiabatensatzes.

Berlin, Springer, 1928. 8vo. Bound in full cloth with gilt lettering to spine, In "Zeitschrift für Physik", Band 51, 1928. Entire issue offered. Embossed stamp to title page and library label pasted on to pasted down front free end-paper, otherwise fine. Pp. 165-80. [Entire volume: VII, (1) 903 pp].

First appearance of Born and Fock's important paper in which they introduced their adiabatic theorem, a concept in quantum mechanics which they stated as follows: " A physical system remains in its instantaneous eigenstate if a given perturbation is acting on it slowly enough and if there is a gap between the eigenvalue and the rest of the Hamiltonian's spectrum." (From the present paper).
The concept of this theorem deals with the time-dependent Hamiltonian - a subject of Quantum dynamics - where the Hamiltonian changes with time.

The present issue also contain Gamow's "Zur Quantentheorie des Atomkernes" containing the first direct calculation of the Geiger-Nuttall law.

Order-nr.: 50601