The Lyman-alpha line reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Lyman-alpha line

The Lyman-alpha line is a spectral line of hydrogen in the Lyman series, emitted when the electron falls from the n=2 orbit to the n=1 orbit. Its wavelength is approximately 121.6 nm.

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