PHOTOELECTRON SOFT-X-RAY FLUORESCENCE COINCIDENCE SPECTROSCOPY ON FREE MOLECULES

A technique for measuring core-level photoemission from free molecules in coincidence with the soft x-ray fluorescence decay is presented. Z ero-kinetic-energy photoelectrons are detected in a time-of-flight ele ctron spectrometer, and photons are collected in a large solid angle b y a detector situated close to the interaction region. The coincidence spectrum of N-2 shows an adiabatic Is line, free from electron-electr on postcollision interaction effects. The results open up new aspects on core-hole excitation-emission dynamics.