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. {} 1996 The American Physical Society.
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