The high-resolution photoabsorption spectra of PH3, PF3, PCl3and PBr3in the XUV region

The high-resolution photoabsorption spectra of PH3, PF3, PCl3 and PBr3 were observed between 130 and 270 eV, where the L2,3 and L1 spectra of phosphine are resolved as well as the L spectrum of chlorine in PCl3. In all four spectra, three broad bands are found between 6 and 4 eV below the L3 ionisation energy. They were interpreted by taking into account both the spin-orbit and electron-electron interactions. In the PF3 spectrum a broad shape resonance was found above the ionisation threshold, while in the PCl3 and PBr3 spectra the corresponding bands lie below the threshold, similar to previously reported results, for BF3, BCl3, and BBr3.