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where the electron has so much energy it escapes the atom.Even though the series is called sharp, the lines may not be sharp.

In alkali metals the P terms are split and . This causes the spectral lines to be doublets, with a constant spacing between the two parts of the double line.

Names

The sharp series used to be called the second subordinate series, with the diffuse series being the first subordinate, both being subordinate to the principal series.

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