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Spectroscopic NotationBefore the atom electron states were known, spectroscopists saw distintive series in atom spectra, and so they asigned letters to characteristic spectra. These letterswere later associated with the azimuthal quantum number l. -
| /dd> | | width="40px" | letter !! name !! width="30px" | l | | s | align="left" | sharp | 0 | | p | align="left" | principal | 1 | | d | align="left" | diffuse | 2 | | f | align="left" | fundamental | 3 | | g | rowspan="3" valign="top" width="150px"| (from here, it follows the alphabetic order) | 4 | | h | 5 | | ... | ... | The spectroscopic notation is used to create the term symbol for the electron states in a multi-electron atom. The above scheme for a single electron's orbital quantum number is applied to the total orbital angular momentum associated to each electron state. See also External links spectroscopic notation
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