Abstract
``Symmetry-resolved'' photoabsorption spectra of free ${\mathrm{N}}_{2}$ molecules in the K-shell excitation region have been obtained using a technique of angle-resolved photoion spectroscopy combined with linearly polarized undulator radiation. The obtained \ensuremath{\Sigma}- and \ensuremath{\Pi}-symmetry component spectra have nicely demonstrated the symmetry decomposition of the photoabsorption spectrum. These spectra have been compared with theoretical calculations in the photon-energy regions below and above the ionization threshold.
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