| Summary: | 博士 === 國立中央大學 === 物理與天文研究所 === 89 === In the part I, lithium 1s photoelectron spectra are reported in high electron and photon energy resolution, with resolved LS term structure of the Li+ 1snl satellite transitions up to n = 6 for the first time. Branching ratios and anisotropy parameters of individual lines, determined over the 85-130 eV photon energy range, are compared with R-matrix calculations and with previous works. The high-angular-momentum satellite lines (L ³ 2) are found to contribute significantly to the 1snl satellite cross sections for n = 3 and 4, and to become the dominant terms for n ³ 5. The high-angular-momentum lines exhibit the same photon- energy-dependence as the P-lines, providing experimental evidence that the continuum-continuum state coupling (equivalent to virtual electron collision processes) is responsible for the L ³ 1 terms in the satellite spectrum, in contrast to the electron relaxation (shake-up) mechanism responsible for the S-lines. The angular distribution of the lines in the Li+ 1snl, n = 2—6 groups, determined at 110 eV photon energy, is in good agreement with calculations, showing more isotropic distributions for high-angular-momentum lines.
In the part II, the Angular distribution of core-level iodine 4d photoelectrons from the HI molecule was measured using monochromatized synchrotron radiation in the 80-150 eV photon energy range. The anisotropy parameters of all five ligand field split components (Σ1/2 Π1/2, 3/2 and Δ3/2,5/2) of the iodine 4d photoelectron spectrum are determined and found to be equal within experimental uncertainties at all photon energies. A comparison of the photoelectron angular distribution of HI and Xe shows that the molecular 4d photoionization is well described by an atomic model. From high-resolution spectra, the lifetime widths of the I 4d hole states were determined.
|
|---|
