I'm reading McIntyre's QM book and I see the same diagram ever so often:
He goes on to say:
I don't understand what he is trying to say with the last sentence. It seems he is saying, that transitions to higher-levels higher than n = 5 requires absorption of photons. But every level requires the absorption of photons. For example, to go from 1 to 2, we need light absorption.
- What does he mean here?
- Perhaps I am missing the significance of the three series. Perhaps there is some other physics going on?
- What is the significance of the three series? Why are they always shown in textbooks?