The combined electron ion spectrometer. The horizontal thick dashed line denotes the projectile beam molecular beam plane. The slits of the CMA are shown exaggerated for clarity. The figure is approximately to scale.
Simulated trajectories of C+, N+, and O+ ions with 7 eV initial kinetic energy. Black contours are the equipotential lines.
Simulated trajectory of electrons with 70 eV energy. Middle one (green) is the trajectory for electrons with ideal angle of ejection. Outer (red) and inner (blue) trajectories are for electrons with ejection angle varying by +2° and −2° respectively from the ideal ejection angle. Black contours are the equipotential lines.
Time of flight spectrum of Argon corresponding to ionization of 3p shell by 155 eV photons.
Auger electron spectrum of Argon at 250.6 eV photon energy. The dots are the experimental data. The black line is generated by 5-point Savitzky–Golay smoothing. Line identification is done following Werme. 28
Time of flight spectrum of Argon corresponding to L 2 M 2,3 M 2,3(1 S 0, 1 D 2), L 3 M 2,3 M 2, 3(1 D 2, 3 P 0,1,2) Auger transitions. The small Ar+ signal is due to the electron continuum which lies under the Auger peak.
Electron spectrum of CO at 155 eV photon energy. Dots are experimental data. The black curve is the sum of multiple Gaussian fits, the latter shown by dashed curves. The fit extends only up to the double ionization threshold, as beyond this energy the two ejected electrons share the energy continuously, leading to a continuum distribution. I 1 and I 2 indicate the single and double ionization potentials, taken from the NIST database 23 and Hochlaf et al., 30 respectively. Line identification in the range 22 eV – 40 eV follows Eland et al. 31
Time of flight spectrum of CO corresponding to different excitation energies as described in the text.
Kinetic Energy Release distribution for the channel CO+ → O+ + C corresponding to different excitation energies as described in the text. Curves are offset for clarity.
Ion-ion correlation map for the channel CO → C+ + O+, which opens when the excitation energy is just above the double ionization threshold (case (c) described in the text). The inset shows the kinetic energy release distribution for this channel.
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