This is a section about Emission spectrum!
Emission spectrum is a very important subject about which there is a lot to say.
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This is a section about Rydberg formula!
Rydberg formula is a very important subject about which there is a lot to say.
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This is a section about Fine structure!
Fine structure is a very important subject about which there is a lot to say.
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This is a section about Hyperfine structure!
Hyperfine structure is a very important subject about which there is a lot to say.
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This is a section about Emission spectrum!
Emission spectrum is a very important subject about which there is a lot to say.
For example, this sentence. And then another one.