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(MgO)(-)(n) (n = 1-5) clusters: multipole-bound anions and photodetachment spectroscopy | | M Gutowski
; P Skurski
; X Li
; L S Wang
; | | Date: |
9 Oct 2000 | | Journal: | Phys Rev Lett, 85 (15), 3145-8 | | Abstract: | Photoelectron spectra of (MgO)(-)(n) (n = 1-5) reveal a surprising trend: The electron binding energy decreases from n = 1 to 4, and then increases from 4 to 5. Ab initio calculations suggest this pattern is related to the electrostatic interaction between the extra electron and the charge distribution of the neutral cluster. This interaction is significant in MgO (-) and (MgO)-5, for which the lowest nonvanishing multipole moment (LNM) is a dipole; it is smaller for (MgO)-2 and (MgO)-3, for which a quadrupole is the LNM; and it is the smallest for (MgO)-4, for which an octopole is the LNM. The cubic (MgO)-4 is the first octopole-bound anion yet observed experimentally and characterized theoretically. | | Source: | PubMed, pmid11019287 | | Services: | Forum | Review | Favorites | |
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