Abstract
The isotopic effect on the intensity for the inner-shell C 1s (1a1→3a1) or 1s −13s (a1) transition in methane (CH4) and deuteromethane (CD4) is calculated. This transition is dipole forbidden and borrows intensity mainly from the C 1s (1a1→2t2) or 1s −13p (t2) state through vibronic coupling with vibrational modes of t2 symmetry. Absolute oscillator strengths are presented for the above transitions and the vibronic coupling mechanism is interpreted.
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