Electron-impact excitation cross sections for allowed transitions in atoms
Electron-impact excitation cross sections for allowed transitions in atoms
We present semiempirical Gaunt factors for the widely used Van Regemorter formula [Astrophys. J. 136, 906 (1962)] for allowed transitions from ital>l=0 or ital>l=1 levels in atoms with the LS coupling. Cross sections calculated using these Gaunt factors agree with measured cross sections to within experimental error. \textcopyright{} 1996 The …