Fig. 2.

Theoretical and experimental C1s⁻¹→d¹Σ⁺ Auger spectra of CO given for the X-ray photon energies $\omega =2.5$ keV (blue dashed line), 8 keV (red dashed–dotted line), and 12 keV (black solid line). (A) The symmetrical part ${\sigma }_0$ of the calculated partial cross section (Eq. 8), where the dynamical contribution to the rotational Doppler shift is neglected. (B) The total theoretical cross section $\sigma$ of the Auger process displaying the asymmetry of the Auger profile caused by the dynamical rotational Doppler effect. The simulations are convoluted with a Gaussian instrumental function of 0.1-eV width. (C) Experimental data in agreement with the simulations (Fig. 2B) showing that the dynamical asymmetry is growing with increasing photon energy.