Electronic-state interference in the C 1 s excitation and decay of methyl chloride studied by angularly resolved Auger spectroscopy

International audienceResonant Auger (RA) decay spectra of carbon 1s excited CH3Cl molecules are recorded with angular resolutionusing linearly polarized synchrotron radiation. The selected photon energies corresponding to the C 1s → 8a1core to lowest unoccupied molecular orbital and C 1s → 4sa1, 4pe, and 4pa1 core to Rydberg excitations ofmethyl chloride are used and electrons in the binding energy range of 11–37 eV are detected. The vibrationallyunresolved RA electron angular distributions, recorded for participator Auger transitions populating the X, A,B, and C states of the CH3Cl+ ion, exhibit strong variations across the selected electronic resonances. Theseobservations are interpreted with the help of ab initio electronic structure and dynamics calculations, whichaccount for electronic-state interference between the direct and different resonant ionization pathways. Forspectator transitions, the theory predicts almost isotropic angular distributions with moderate changes of βparameters around zero, which is in agreement with the experimental observations