Dipole-forbidden excitations in electron-energy-loss spectroscopy

Jutta M. Auerhammer, Peter Rez

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

For momentum transfers of order 6 A-1 nondipole transitions can make the same contribution to inner-shell energy-loss spectra as dipole transitions. Nondipole transitions are particularly significant when there is a high density of dipole-forbidden states in the near-threshold region. We have studied the near-threshold region in the excitation of molybdenum 3d and the excitations of 2p electrons in TiO2 and SiC as a function of scattering wave vector q. At large q dipole-forbidden monopole transitions become visible as a sharp peak on the M4,5 threshold for molybdenum corresponding to 3d4d transitions or as a change in the L2,3 peaks intensity ratio in the cases of titanium and silicon. Experimental results are confirmed by calculations.

Original languageEnglish (US)
Pages (from-to)2024-2030
Number of pages7
JournalPhysical Review B
Volume40
Issue number4
DOIs
StatePublished - 1989

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Molybdenum
Electron energy loss spectroscopy
energy dissipation
electron energy
dipoles
Momentum transfer
Silicon
Titanium
spectroscopy
excitation
Energy dissipation
molybdenum
thresholds
Scattering
Electrons
wave scattering
monopoles
momentum transfer
titanium
silicon

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Dipole-forbidden excitations in electron-energy-loss spectroscopy. / Auerhammer, Jutta M.; Rez, Peter.

In: Physical Review B, Vol. 40, No. 4, 1989, p. 2024-2030.

Research output: Contribution to journalArticle

Auerhammer, Jutta M. ; Rez, Peter. / Dipole-forbidden excitations in electron-energy-loss spectroscopy. In: Physical Review B. 1989 ; Vol. 40, No. 4. pp. 2024-2030.
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