Portal de Periódicos da CAPES

Electronic excitations in phosphorus-containing molecules. I. Inner shell electron energy loss spectra of PH3, P(CH3)3, PF3 and PCL3

1985; Elsevier BV; Volume: 37; Issue: 1 Linguagem: Inglês

10.1016/0368-2048(85)80085-2

1873-2526

R. N. S. Sodhi, C.E. Brion,

Advanced Chemical Physics Studies

Abstract Electron energy loss Spectroscopy has been used to obtain the inner shell electronic excitation spectra of PH3, PF3, PCl3 and P(CH3)3 in the phosphorus L-shell (P 2p, 2s) region as well as the respective ligand K -shells (F 1s, C 1s) and L-shell (Cl 2p and 2s) regions. The spectra were obtained under small momentum transfer conditions so that dipole-allowed transitions dominate. An impact energy of 2.5 ke V was used and inelastically scattered electrons were detected at a typical scattering angle of about 1°. A dipoleforbidden transition of unusual character is observed at 135.11 eV in the P 2p spectrum of PCl3. Although optically forbidden, as indicated by its absence in a soft X-ray absorption spectrum, the intensity of this transition rises very rapidly with increase in momentum transfer.