Bemerkung betreffs der spezifischen Wärme zweiatomiger Gase, pp. 451-7 in: Verhandlungen der Deutschen Physikalischen Gesellschaft im Jahre 1913, Nr. 11. THE ADIABATIC HYPOTHESIS

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First edition, complete journal issue in original printed wrappers, of the first formulation of Ehrenfest's 'Adiabatic Hypothesis' of quantum theory. "Two important heuristic principles have guided quantum physicists during the period 1913-1925, viz. Ehrenfest's Adiabatic Hypothesis and Bohr's Principle of Correspondence. The Adiabatic Hypothesis, first formulated by Ehrenfest in 1913 [in this paper], says: 'If a system be affected in a reversible adiabatic way, allowed motions are transformed into allowed motions'" (Van der Waerden, Sources of Quantum Mechanics, pp. 3-4). "In a series of papers that appeared from 1913 to 1916, Ehrenfest studied the possibility of generalizing the notion of quantization, previously applied only to oscillators. He showed that every periodic system possesses a property invariant under slow (adiabatic) changes in its parameters: the ratio of the kinetic energy, averaged over one period, to the frequency. Ehrenfest proposed that only such adiabatic invariants could properly be quantized and also that when the parameters of a quantized system are changed adiabatically, the allowed quantum states of the original system continue to be the allowed quantum states. Ehrenfest and his student J. M. Burgers showed that this adiabatic principle encompassed the various quantization methods introduced independently by a variety of physicists. The adiabatic principle was widely used and highly prized as one of the few reliable guides to progress during the difficult years of the old quantum theory, when even the laws of conservation of energy and momentum were suspect" (DSB). 8vo (228 x 152 mm). Original printed wrappers (faint rubber stamp to front wrapper). N° de ref. del artículo ABE-1601916221750

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