Transitions

• Electron in ground state E1 can move to the excited state E3 if it absorbs energy equal to E3-E1

• absorb a photon hf= E3-E1

• electron will not stay in the excited state for long => emits a photon or a sequence of photons

hf= E3 - E1

hf = E3 - E2 = hc/?

hf = E2 - E1 = hc/?

Emission spectrum

photon

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