Quantum Beats - Calculation Based On Semiclassical Theory

Calculation Based On Semiclassical Theory

In the semiclassical picture, the state vector of electrons is

.

If the nonvanishing dipole matrix elements are described by

for V-type atoms,
for -type atoms,

then each atom has two microscopic oscillating dipoles

for V-type, when ,
for -type, when .

In the semiclassical picture, the field radiated will be a sum of these two terms

,

so it is clear that there is an interference or beat note term in a square law detector

.

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