energies. We note that a pronounced "alternation effect" is apparent in that the differences in ionization energies between P406 and As4Os are much less pronounced than those between As406 and Sb406. Similar effects are found in PE spectra of the group 5 hydrides23 and halides. 24,25 We turn attention now to discussion of fine structure apparent in the first band in PE spectra of As406 and Sb406.In their study of the arsenic compound Cannington and Whitfield26 assumed that the first band represented three distinct ionization processes involving arsenic and oxygen lone pairs, although they failed to venture an assignment in terms

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A lanthanide ligand is reported, amenable to be immobilized on a protein surface via cysteine residues. This probe yields large single shifts of the protein nuclei resonances in HSQC NMR spectra and causes significant alignment of the protein in the magnetic field, providing additional structural restraints. Anchoring the probe by two cysteine residues instead of one is highly beneficial for the size of its effects.

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