Div. of Synchrotron Radiation Research


R. Feifel, V. Kimberg, A. Baev, F. Gelmukhanov, H. Ågren, C. Miron, G. Öhrwall, M. N. Piancastelli, S. L. Sorensen, L. Karlsson and S. Svensson
Profile of resonant photoelectron spectra versus the spectral function width and photon frequency detuning
Phys. Rev. A 70, 032708 (2004)

The outermost, singly ionized valence state of N2, the X  2 state, is investigated in detail as a function of the photon frequency bandwidth for core excitation to the N  1s* resonance, where the photon frequency is tuned in between the first two vibrational levels of this bound intermediate electronic state. We find a strong, nontrivial dependence of the resulting resonant photoemission spectral profile on the monochromator function width and the frequency of its peak position. For narrow bandwidth excitation we observe a well resolved vibrational fine structure in the final electron spectrum, which for somewhat broader bandwidths gets smeared out into a continuous structure. For even broader monochromator bandwidths, it converts again into a well resolved vibrational progression. In addition, spectral features appearing below the adiabatic transition energy of the ground state of N are observed for broadband excitation. A model taking into account the interplay of the partial scattering cross section with the spectral function is presented and applied to the X  2 final state of N.

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