High Resolution Gas Phase Photoelectron Spectra of Core d Levels Using He II Radiation
| Autor: | L.L. Coatsworth, G.M. Bancroft, David K. Creber, J Tse |
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| Rok vydání: | 1977 |
| Předmět: | |
| Zdroj: | Physica Scripta. 16:217-220 |
| ISSN: | 1402-4896 0031-8949 |
| DOI: | 10.1088/0031-8949/16/5-6/008 |
| Popis: | Using a newly constructed charged particle oscillator He II discharge lamp, we have obtained high resolution (⩽0.03 eV instrumental resolution) spectra of the outermost metal core d levels in alkyl compounds of Cd, In, and Pb. The Cd and In 4d spectra of Me2Cd (Me = CH3), Et2Cd (Et = C2H5) and Me3In are split into five peaks due to the combined effects of spin orbit splitting (5/2 λ) and an asymmetric crystal field (the C 2 0 term which transforms like the electric field gradient). As expected, the spin orbit split Pb 5d levels in the tetrahedral molecule Et4Pb (C 2 0 = 0) show no noticeable crystal field splitting. The new photoelectron effect enables electric field gradients to be obtained in the gas phase. Our derived C 2 0 values are consistent with previously measured nuclear electric field gradients in Cd and In compounds; and the measured C 2 0 value for Me2Cd is in qualitative agreement with that calculated by H. Basch from an ab initio self-consistent field (SCF) calculation. Because the measured linewidths are mainly due to the inherent natural linewidths of the d levels, we can readily obtain natural d widths from these spectra. The high resolution spectra of the Cd 4d levels of Et2Cd enable us to resolve Cd 4d peaks due to Cd atoms and EtCd· radicals. The Cd 4d spectra of Me2Cd and Et2Cd taken at 21.2 eV, 40.8 eV, and 51.0 eV photon energies show marked changes in the relative intensities of the five 4d peaks. |
| Databáze: | OpenAIRE |
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