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" ... *With apologies to purists, the HTML used for this CSS does not permit the use of subscripts. Hence, the 2C is not subscripted. ... "
" ... Given those three processes, Einstein assigned probabilities to them (these days, the probability of spontaneous emission is given the symbol "A" and the probabilities of absorption or stimulated emission get represented by "B" with some subscripts), and then looked at what could be deduced about these probabilities and the properties of light. He found a wealth of stuff that could be experimentally tested, including a simple relationship between the A and B coefficients, and a formula for A in terms of the frequency of light and some other well-known properties. These "Einstein coefficients" remain a useful way to describe the interaction between light and atoms. He also showed that the interaction must transfer energy and momentum between atoms and light, and that this pictures gave yet another way to explain the Planck formula for the black-body spectrum of light emitted by hot objects. It's a masterful bit of work, and was important in convincing physicists to accept the quantum nature of light. ... "