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We report the results of coincidence measurements of Auger electron–ion pairs generated by 1 keV electron beam bombardment of argon where, for the first time, the electron energy resolution is comparable to the natural width of 2p hole. The L–MM Auger spectrum is decomposed into contributions related to the specific final ionic charge states Ar 2 + to Ar 5 + allowing the study of decay schemes which lead to different structures in the non-coincidence Auger spectra.

A short overwiev of recent results on x-ray emission obtained by JSI high resolution spectrometer is given. The report is about photoexcitation of atomic and molecular targets and deals with topics such as isolation of multiple excitation channels, the resonant Raman effect in radiative Auger decay, the interference of absorption-emission paths, and the sensitivity of resonant emission spectra to molecular relaxation.

Resonant Inelastic X-ray Scattering (RIXS) measurements were performed on H2S molecules with excitation energy tuned around the 1s ionization threshold of sulfur. A Johansson type crystal spectrometer was employed to record a series of resonant Kα (1s→2p transition) and Kβ (1s→3p transition) x-ray spectra in the 2469–2489 eV excitation energy range building a full 2D scattering plane. Ultrafast nuclear dynamics have been observed in the RIXS H2S spectra measured after excitation along the dissociative resonance around 2472 eV.