The observation of electric-dipole-forbidden inner-shell transitions in N2 and Ar by the electron energy-loss technique

By using low-energy electron impact excitation the authors have observed the first example of an inner-shell single-to-triplet transition, namely the transition from the ground state to the (1s)-1( pi 2p) 3 Pi state of N2. The parameters omega e and Re of the triplet state have been deduced from the observed vibrational structure of the transition. The parity-forbidden transition to the (2p32/)-14p state of Ar has also been studied, and the intensity of this transition relative to that of the electric-dipole-allowed transition to the (2p32/)-14s state has been measured as a function of the incident electron energy.

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