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| abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > spectral line > ionized helium line > ionized helium Balmer line > He II Balmer alpha |
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| He II Balmer alpha comparison table | |||
| Subject | is a kind of | has wavelength | is an instance of |
|---|---|---|---|
| ionized helium Balmer line | ionized helium line | ||
| He II Balmer alpha | 1640 Å | ionized helium Balmer line |