抄録
With a high-resolution two-crystal vacuum spectrometer, the phosphorus Kβ emission spectra in fluorescence are measured for H3PO_{3 (= H2PHO3)}, H3PO4, Li3PO4, Na3PO4· 12H2O, Na2HPO4, NaH2PO4, K3PO4· nH2O, K2HPO4, KH2PO4, Ca3(PO4)2, CaHPO4· 2H2O, Ca(H2PO4)2· H2O, CaHPO3· H2O, Ca(H2PO2)2 and NH4H2PO4. In the phosphate compounds, a weak peak is observed on the high-energy side of the main peak Kβ 1 and related to a molecular orbital of t2 symmetry in the PO43-ion. It is shown that the phosphorus Kβ emission spectra are influenced by ligand substitution and cations. The measured Kβ emission spectra of Li3PO4, Na3PO4· 12H2O, K3PO4· nH2O and Ca3(PO4)2 are presented along with the previously reported P-K absorption spectra of these phosphate compounds. The emission and absorption spectra are interpreted in terms of available molecular orbitals of the PO43- ion.
