Isomeric sensitivity of the C 1s spectra of xylenes

Oscillator strengths for C 1s inner-shell excitation of the isomeric xylenes (ortho-, meta- and para-) have been derived from electron energy loss spectra recorded under scattering conditions dominated by electric dipole transitions. The lineshape of the C 1s→π* transition is found to be dependent on the substitution pattern, with para-xylene exhibiting two components, ortho-xylene a single asymmetric peak, and meta-xylene a single symmetric …