Theoretical and Experimental Search for Evidence of Core Hole Localization in X-ray Photoionization of CCl}$_{\mathrm{\mathbf{4}}}$\textbf{ at the Cl 2p-edge

Recently, unambiguous evidence of core hole localization in X-ray photoionization of CF$_{\mathrm{4}}$ at the F K-edge was found in the combination of theoretical and experimental determinations of the recoil frame photoelectron angular distributions (RFPADs). In that case, detection of the CF$_{\mathrm{3}}^{\mathrm{+}} \quad +$ F$^{\mathrm{+}}$ fragments following Auger decay in coincidence with the photoelectron verified that the observed RFPAD arose from ionization of the fluorine atom that was ultimately detected as F$^{\mathrm{+}}$ [Phys. Rev. A 95, 011401(R) (2017)]. Similar theoretical calculations of RFPADs for ionization of CCl$_{\mathrm{4}}$ at the Cl 2p L-edge using the Complex Kohn variational method are compared here with COLTRIMS measurements of RFPADs for this case. The localization effect that is evidently related to the strong electronegativity of the F atom was predicted to occur in the case of chlorine which is slightly less electronegative. We explore the comparison of calculated RFPADs from close-coupling calculations for various polarization directions with observations in the CCl$_{\mathrm{3}}^{\mathrm{+}} \quad +$ Cl$^{\mathrm{+}}$ decay channel to search for evidence of the same effect in this system.