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forbidden line

   Also found in: Wikipedia 0.01 sec.
forbidden line [fər¦bid·ən ′līn]
(atomic physics)
A spectral line associated with a transition forbidden by selection rules; optically this might be a magnetic dipole or electric quadrupole transition.
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However, when state legislators decided to appropriate a few Christian symbols for their political purpose (never too unhealthy to pander to the state majority in a turmoil-filled election year), they crossed a forbidden line.
My profession of faith: 'I Believe' government should hot endorse ... by Lynn, Barry W. / Church & State
Some of the features observable with this phenomenon include strong Balmer line emissions, forbidden line emissions from low-ion elements and the presence of an infrared excess due to hot circumstellar dust.
Stars with the B[e] phenomenon; proceedings by SciTech Book News
The tables are arranged in order of decreasing wavelengths, and they include so-called forbidden lines, which are very important for plasma diagnostic applications.
NEW NIST MONOGRAPH OF SPECTRAL DATA FOR HIGHLY IONIZED ATOMS by Journal of Research of the National Institute of Standards and Technology
 
 
 
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