Tag: Radiation

This work is a further study of Albert Einstein’s article, “Emission and Absorption of Radiation in the Quantum Theory” (Strahlungs Emission und Absorption nach der Quantentheorie). A brilliant work published in 1916.
This work of mine is written in Italian.

  Brussi 2023_Einstein 1916 Emissione e assorbimento di radiazione

ABSTRACT
Albert Einstein’s study, “Emission and Absorption of Radiation According to Quantum Theory,” [Einstein, 1916], proposed an original interpretation for the probabilities of exchanges between atomic energy levels, predicting spontaneous emissions, as well as absorption and radiation-stimulated emissions, from molecules in thermodynamic equilibrium. This study made the coefficient associated with spontaneous emissions Aji, the absorption coefficient Bij, and the coefficient associated with stimulated emissions Bji famous; it also laid the theoretical foundation for the development of lasers.
In-depth analysis: a paraphrase of the conjectures in Einstein’s original publication, an in-depth analysis of the parameter associated with the coefficients called the oscillator strength (derived with different procedures for both spontaneous emission and absorption of radiation), and some examples of the use of Einstein’s coefficient Aji in astronomical spectroscopy.