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snorkack
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Protium atom has two low lying excited states with long lifetimes.
These are:
These are:
- 2s. Decay energy would be 121 nm, but forbidden (no angular momentum difference). Fastest allowed decay is two-photon emission, lifetime 0,15 s
- Triplet 1s. Decay energy 211 mm. Prevalent decay single photon emission, lifetime 10 million years.
- First vibrational excited state - decay energy 2,12 μm
- Parahydrogen first rotational excited state, J=2 (due to Pauli principle, J=1 state cannot exist for parahydrogen) - decay energy 28,22 μm
- Spontaneous decay of orthohydrogen - decay energy about 85 μm, but rather strongly forbidden. How strongly exactly - what´s fastest allowed decay mode, and the lifetime?