Principles of Quantum Mechanics · Problem 18.4

Time-Dependent Perturbation Theory — R. Shankar

Physics — Quantum Mechanics · fermi-golden-rule

Problem

Calculate the lifetime of the

2p

state of hydrogen (i.e., the

n=2

l=1

m=0

state; note that the lifetime is the same for all

m

values). The answer is

1.60 \times 10^{-9}