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Spectrum of MeCl (Reproduced by permission from 'Molecular Photoelectron Spectroscopy,' Wiley, New York, 1970) structures for halogen lone-pair ionisations are also encountered in molecules of low symmetry where the p x and p y halogen pn orbitals are no longer degenerate. Linear molecules may exhibit particularly simple multiplet fine structure, since first-order Jahn-Teller terms vanish. e. band with a clearly discernible spinorbit splitting (Figure 9). e. e. , where the effects of spin-orbit coupling at the xenon site are clearly evident.

These authors also conclude that the metal d" shell. markedly split into its r z and e components in Ni(PF,),. is only slightly split in the platinum compound. This conclusion has been challenged by Hillier et crl. who interpret the Pt(PF,), He' spectrum of Lloyd and * However, it is important t o remember that the SCF M O energies are not in general simply reiated to ligand field orbital energies (which d o not contain contributions from electron repulsion within the perturbed d shell). r. e. spectrum of’VCl, compared with that of TiCl, (Reproduced by permission from Chem.

E)4(t2)6and (e’)4(e”)4. respectively. The inferred relative energies, t , > e, for the Ni(CO), d-orbitals are 15’ C. E. Moore, ’Atomic Energy Levels,’ Circular no. 467, Nat. Bur. , vols. 1-111, 1949, 1952, and 1958. e. spectra of ( a ) Cr(C0)6 ( b ) Fe(CO), ( c ) V(CO), (d) Ni(C0)4 showing in each the region of predominantly d-ionisation [Reproduced by permission from (a) ‘Molecular Photoelectron Spectroscopy, Wiley, New York, 1970; (b) and (d) Znorg. , 1969,8,2544; (c) Chem. Ph,vs. e. spectra is much facilitated by a comparison with the spectrum of free carbon monoxide.

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Application of High Magnetic Fields in Semiconductor Physics LNP0177


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