Effect of Collisions on the Intensities of Nebular Lines


MENZEL1 has recently stated that “There appears to be a widespread misconception concerning the effect of electron collisions on the intensities of forbidden lines”. In the conventional treatment to which the above statement objects, the intensity is given by the formula where M is the number of atoms excited to the upper state per unit of time, A21 is the… (More)
DOI: 10.1038/1421079b0


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