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Zur Quantentheorie der Strahlung

Albert Einstein
- Vol. 18, pp 47
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TLDR
In this paper, the spectral distribution curve of temperature radiation was shown to be similar to the velocity distribution of the electromagnetic spectrum of a single photon, and the formal similarity of spectral distribution curves to Maxwell's velocity distribution curve was revealed.
Abstract
The formal similarity of the spectral distribution curve of temperature radiation to Maxwell’s velocity distribution curve is too striking to have remained hidden very long.

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Citations
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Dynamical theory of an atom with two or three levels interacting with quantized cavity fields

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The semiclassical theory of laser cooling

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