Cover Imaging for Physicists

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• Spin system under an external magnetic field

exposed to electromagnetic radiation

• Transitions from spin down to spin up or vice

versa may occur if

ℏ

ω

= ΔE

pot

=

γ

ℏ

B

ℏ

ω

ΔE

pot

=

γ

ℏ

Β

Isidor Isaac Rabi