An equal superposition of two stationary states in an infinite well beats with period
PHYSICS · Subjective · Fermi University Physics · Quantum Mechanics · Quantum dynamics and its formulations · Symmetry, angular momentum and spin
Quantum Mechanics: From the Photon to the Hydrogen Atom, Ch Spin one-half, the Pauli matrices and two-level systems
Problem
An equal superposition of two stationary states in an infinite well beats with period T=h/(E2−E1), the energy gap between them. Ammonia's two stationary states are split by 2Δ=9.9×10−5eV. Write the full beat period of the double well in the same form, T=h/(2Δ), and show it is exactly twice the crossing time t=1/2ν=2.1×10−11s found in this chapter's worked example.