## Niels Bohr on the Application of the Quantum Theory to Atomic Structure, Part 1, The Fundamental Postulates, Part 1Niels Bohr (1885-1962) was a Danish physicist who played a key role in the development of atomic theory and quantum mechanics, he was awarded the Nobel Prize for Physics in 1922. First published in 1924, this concise volume provides an English translation of a 1923 German language essay which appeared in the Zeitschrift für Physik journal. It concerns itself with the fundamental postulates of quantum theory, aiming to present the principles of the theory in such a way that their application appears free from contradiction. This book will be of value to anyone with an interest in Bohr's contribution to physics. |

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absorption according adiabatic invariance Adiabatic Principle appearing application assumption Chapter classical electrodynamics classical mechanics classical theory conceptions connection conservation of energy consider contact transformation Correspondence Principle corresponding vibration deﬁned deﬁnition degree of periodicity degrees of freedom described diﬁerence discussed Ehrenfest Einstein electromagnetic radiation electrons emission of radiation equations of motion essential exchange of energy external ﬁeld external forces fact ﬁeld of force ﬁeld of radiation ﬁnd ﬁrst approximation ﬁxation ﬁxed ﬁxing the stationary formal frequency fur Phys harmonic components inﬂuence isolated atomic system large quantum numbers limiting region magnetic ﬁeld mean value mechanical mentioned microperiodic momentum multiply periodic character multiply periodic systems nature particles periodic properties perturbed system Planck’s constant possible present problem processes of radiation processes of transition quantities quantum theory question radiative processes regarded region of large secular perturbations signiﬁcance simple so-called spectra spectral lines stability tion undisturbed motion undisturbed system uniformising variables wave-system