Callen H.B - Thermodynamics And An Introduction To Thermostatistics · Problem 16.5-2

THE CANONICAL FORMALISM; STATISTICAL MECHANICS IN HELMHOLTZ REPRESENTATION

Physics — Statistical Mechanics · hydrogen-atom-orbital-probability

Problem

A hydrogen atom in equilibrium with a radiation field at temperature TT can be in its ground orbital level (the ``1-s'' level, which is two-fold spin degenerate), or it can be in its first excited energy level (eight-fold degenerate). Neglect the probability of higher energy states. What is the probability that the atom will be in an ``orbital pp-state''?

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