Photoionization of C$_{\mathrm{\mathbf{60}}}$\textbf{: Effects of correlation on cross sections and angular distributions of valence subshells}

Calculations of the photoionization of all of the 32 valence subshells, from the outermost 6h$_{\mathrm{u\thinspace }}$to the innermost 2a$_{\mathrm{g}}$, of the free C$_{\mathrm{60}}$ molecule have been performed using a time-dependent density function theory (TDDFT) methodology within the framework of a fully molecular model [1]. Cross sections and photoelectron angular distribution $\beta $ parameters have been obtained and the results have been broadened to simulate vibrational structure. In addition, the calculations are performed at the ordinary density functional theory (DFT) level, basically central-field calculations, in an effort to understand the role of correlation in the photoemission process. The spectra are fraught with narrow autoionizing and shape resonances which make then quite difficult to analyze, along with the much broader confinement resonances [2]. The narrow shape resonances show up quite clearly in the photoionization at energies above the lowest 2a$_{\mathrm{g\thinspace }}$threshold and in the 2a$_{\mathrm{g\thinspace }}$cross section itself where autoionization is not possible. [1] A. Ponzi, P. Decleva and S. T. Manson, Phys. Rev. A 92, 023405 (2015); [2] J.-P. Connerade, V. K. Dolmatov and S. T. Manson, J. Phys B \textbf{33}, 2279 (2000).