Electron-excitation energy-dependent features in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>M</mml:mi></mml:math>-series x-ray spectrum of lanthanum

Liefeld, R. J.; Burr, A. F.; Chamberlain, M. B.

doi:10.1103/physreva.9.316

Cited by 98 publications

(8 citation statements)

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“…2 In general, such resonant phenomena can be described as an interaction between a discrete channel and a continuum. 3 Analogous effects 4 have been observed in the time-reversed photoemission process, i.e., inverse photoemission 5 or bremsstrahlung isochromat spectroscopy. So far, these resonant phenomena have involved a core-to-valence transition as the discrete channel.…”

Section: Resonant Inverse Photoemission Via Plasmonsmentioning

confidence: 82%

Resonant Inverse Photoemission via Plasmons

Drube

Himpsel

1988

Phys. Rev. Lett.

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A large enhancement, up to a factor of 30, of the photon intensity is observed in inverse photoemission when the emitted photon energy equals the plasmon energy. The effect is explained as a resonance between a discrete channel, i.e., radiative decay of a plasmon, and the inverse photoemission continuum. Examples are shown for various structures of antimony films.PACS numbers: 79.20.Kz, 73.20.Mf Resonant photoemission has generated considerable interest for the study of multielectron phenomena in solids. 2 In general, such resonant phenomena can be described as an interaction between a discrete channel and a continuum. 3 Analogous effects 4 have been observed in the time-reversed photoemission process, i.e., inverse photoemission 5 or bremsstrahlung isochromat spectroscopy. So far, these resonant phenomena have involved a core-to-valence transition as the discrete channel. Therefore, they are limited to the high-energy regime where core levels are accessible. We see a new type of resonance which is based on a plasmon excitation as the discrete channel. The observed resonant enhancement is dramatic (a factor of 30 in the example shown below). An analogous effect is predicted to exist in photoemission.An overview of the resonance effect is given in Fig. 1. The data were taken for a thin Sb film evaporated onto a cleaved InP(l 10) crystal. It shows a series of spectra for the photons that are produced by electrons arriving with energy E[ at the Sb surface. The electron energies range from Eir = 11.6 eV above the Fermi level E? (top curve) to Et =28.6 eV (bottom curve) in steps of 0.5 eV. The spectrum of emitted photons is recorded by a spectrograph with a position-sensitive detector as described previously. 7 The two channels that lead to emission of photons can be identified by their energy dependence. The discrete channel emits photons of a fixed photon energy which equals the plasmon energy of the Sb film hco p = 16.4 eV. 8 Thus, it corresponds to a vertical line in Fig. 1. The inverse photoemission continuum is characterized by a photon spectrum with an upper limit at hco^Ei-Ef: corresponding to a diagonal line in Fig. 1 (arrow labeled E?). This upper limit corresponds to radiative transitions into empty electronic states just above £F-For the Sb film on InP(l 10) several empty electronic (surface) states are observed at constant final-state energies. The lowest state is located at JEF + 0.25 eV. Transitions into higher-lying final states (e.g., at E? +0.95 eV and £V+3.9 eV) correspond to diagonal lines displaced downwards from the E? arrow by the energy of the final states. Whenever one of these diagonal ridges crosses the vertical plasmon line there is a resonant enhancement that by far exceeds the mere sum of the two channels. For the state at ZTF + 0.25 eV the intensity increases by a factor of 30 at resonance and leads to signal levels that are at least an order of magnitude higher than those we have encountered with any material stud-T

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Section: Resonant Inverse Photoemission Via Plasmonsmentioning

confidence: 82%

Resonant Inverse Photoemission via Plasmons

Drube

Himpsel

1988

Phys. Rev. Lett.

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“…In recent years, the de Haas-van Alphen effect has developed into a powerful technique for studying the anisotropy of the impurity-limited lifetime of Bloch electrons on the Fermi surfaceo 1 Theoretical progress has been somewhat slower: Although one is now able to give a realistic description of the electronic structure of the host crystal, a self-consistent treatment of the impurity is still lacking. Sorbello, 2 in his pioneer-ing work on anisotropic lifetimes in polyvalent simple metals, describes the effective potential at the point defect by a locally and linearly screened pseudopotential, and computes scattering phase shifts in the first Born approximation, More recently Tomlinson, Carbotte, and Piercy 3 have extended Sorbello's method in the case of AZMg, by properly recalculating the (linearly) screened impurity pseudopotential, and including…”

Section: Impurity Scattering On the Fermi Surfaces: A (More) Realistimentioning

confidence: 99%

M-Series Soft-X-Ray Appearance-Potential Spectroscopy ofYb2
Harte
¹
,
Szcezepanek
²

1979
Phys. Rev. Lett.

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“…The similar effect of the mutual resonance enhancement of two radiation channels was observed before in ͑La,Ce͒ M 4,5 XES when the moving high-energy edge of Bremsstrahlung matches the energies of the M 4,5 emission lines. 22 Why is the resonance effect not revealed so brilliantly under passing of the Fe L 3 RXES through the Fe L 3 NXES ͑706 eV͒? Most probably this is due to the fact that, although the elastic peak ͑1͒ is a main line in the Fe L 2 RXES, at E exc ϭ706 eV it is still rather weak because of a low probability of excitation of the Fe L 3 level at this energy.…”

Section: Resultsmentioning

confidence: 99%

Inelastic x-ray scattering measurements of iron organophosphonate

et al. 2001

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Electron-excitation energy-dependent features in theM-series x-ray spectrum of lanthanum

Cited by 98 publications

References 1 publication

Resonant Inverse Photoemission via Plasmons

Resonant Inverse Photoemission via Plasmons

M-Series Soft-X-Ray Appearance-Potential Spectroscopy ofYb2
Harte
¹
,
Szcezepanek
²

1979
Phys. Rev. Lett.

Inelastic x-ray scattering measurements of iron organophosphonate

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Electron-excitation energy-dependent features in theM-series x-ray spectrum of lanthanum

Cited by 98 publications

References 1 publication

Resonant Inverse Photoemission via Plasmons

Resonant Inverse Photoemission via Plasmons

M-Series Soft-X-Ray Appearance-Potential Spectroscopy ofYb2Harte1, Szcezepanek2 1979Phys. Rev. Lett.

Inelastic x-ray scattering measurements of iron organophosphonate

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M-Series Soft-X-Ray Appearance-Potential Spectroscopy ofYb2
Harte
¹
,
Szcezepanek
²

1979
Phys. Rev. Lett.