The excited and continuum states in the NEXAFS region of ClF and ClF are investigated near the Cl 1s and 2p 3
ionization thresholds. Below the edge the electronic excitations are described with a highly correlated ab-initio method
. QDPTCI . The region above edge is treated employing an explicit continuum method, based on a LCAO formalism within
the framework of the density functional theory. The theoretical spectra of ClF are analysed with respect to analogous
calculated spectra of Cl and HCl. The results obtained for ClF molecule are compared with the experimental available 2 3
spectra and show a fairly good accord, allowing an assignment of the spectral structures both below and above the threshold.
The theoretical results are discussed in terms of the chemical environment and cage effects caused by the presence of the
fluorine atoms.
