We have encountered stimulated emission, (stimulated) absorption, and spontaneous emission. How come there is no such thing as spontaneous absorption?
Chapter 11, Problems #28
We have encountered stimulated emission, (stimulated) absorption, and spontaneous emission. How come there is no such thing as spontaneous absorption?
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Related Book For 
Introduction To Quantum Mechanics
3rd Edition
Authors: David J. Griffiths, Darrell F. Schroeter
ISBN: 9781107189638