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Electron Spectroscopy of Exploding Fast Molecular lons

We have measured Auger electrons emitted from atomic (C+-, N+-, O+)- and molecular (N2+-, CO+)-projectiles (ca. 80 keV A-1) excited under single collision conditions in thin gaseous targets (N2, CO2). The dominant lines in the observed spectra can be attributed to the decay of Li-and Be-like configurations using intermediate coupling Dirac-Fock calculations. Molecular projectiles (N2+ and CO+) loose their binding electrons in the collisions and the molecular fragments explode via Coulomb repulsion, imposing their kinematics on the deexcitation radiation. This results in an additional kinematic line broadening in the Auger electron energy spectra. It can be well separated from all other contributions to the total linewidth by comparing the spectra of atomic and molecular projectiles of equivalent velocity.