Apparatus for positron annihilation-induced Auger electron spectroscopy

Lei, Chun; Mehl, D.; Köymen, A. R.; Gotwald, Fred; Jibaly, M.; Weiss, A. H.

doi:10.1063/1.1140471

Cited by 44 publications

(10 citation statements)

References 7 publications

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“…These peak energies are consistent with previous measurements of C KVV (263 eV) and O KVV (503 eV) [9]. We note that the peak energies measured with our spectrometer are lower due to the incomplete parallelization of the outgoing Auger electron momentum [10]. In addition, we observe a broad low energy (high ToF) peak.…”

Section: Methodssupporting

confidence: 92%

Positron Annihilation-Induced Auger Electron Spectroscopy Measurements of a TiO₂(110) Surface

et al. 2020

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We report here positron annihilation-induced Auger electron spectroscopy measurements of an as received TiO2(110) surface. We observe peaks at ∼ 250 eV and ∼ 500 eV due to the Auger decay of annihilation-induced 1s holes in carbon (C KVV), and oxygen (O KVV) respectively. In addition to these KVV Auger peaks we observe a broad, low energy peak extending up to 15 eV. Since the incident positron beam energy of 1.5 eV is well below the energy threshold required to directly knock out electrons with kinetic energies up to 15 eV, this peak must be Auger-related. Based on energy conservation requirements and its considerable spectral weight, we argue that this low energy peak is principally due to the Auger decay of both annihilation induced 2s core holes in oxygen and annihilation induced valence holes in carbon.

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Section: Methodssupporting

confidence: 92%

Positron Annihilation-Induced Auger Electron Spectroscopy Measurements of a TiO₂(110) Surface

et al. 2020

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“…On the other hand the measurement times for surface studies could be reduced considerably by improving detection efficiencies, e.g. for recording electron spectra, and by development of new techniques such as the combination of the time-of-flight method and adiabatic magnetic beam guiding systems [11,12].…”

Section: Introductionmentioning

confidence: 99%

Positrons in surface physics

Hugenschmidt¹

2016

Surface Science Reports

124

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Within the last decade powerful methods have been developed to study surfaces using bright low-energy positron beams. These novel analysis tools exploit the unique properties of positron interaction with surfaces, which comprise the absence of exchange interaction, repulsive crystal potential and positron trapping in delocalized surface states at low energies. By applying reflection highenergy positron diffraction (RHEPD) one can benefit from the phenomenon of total reflection below a critical angle that is not present in electron surface diffraction. Therefore, RHEPD allows the determination of the atom positions of (reconstructed) surfaces with outstanding accuracy. The main advantages of positron annihilation induced Auger-electron spectroscopy (PAES) are the missing secondary electron background in the energy region of Auger-transitions and its topmost layer sensitivity for elemental analysis. In order to enable the investigation of the electron polarization at surfaces low-energy spin-polarized positrons are used to probe the outermost electrons of the surface. Furthermore, in fundamental research the preparation of well defined surfaces tailored for the production of bound leptonic systems plays an outstanding role. In this report, it is envisaged to cover both, the fundamental aspects of positron surface interaction and the present status of surface studies using modern positron beam techniques.

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“…The -Auger coincidence data were acquired using a magnetically guided positron annihilation-induced Auger system [15] with the addition of a high purity Ge (HPGe) detector, multichannel analyzer (MCA), and fast coincidence circuitry (Fig. 1).…”

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confidence: 99%

Gamma Spectra Resulting from the Annihilation of Positrons with Electrons in a Single Core Level

et al. 2002

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The first gamma spectra associated with the annihilation of positrons with individual core levels (Cu 3p and Ag 4p) are presented. The spectra were obtained by measuring the energy of gamma rays time coincident with Auger electrons emitted as a result of positrons annihilating with a selected core level. Relativistic calculations show good agreement with experiment over a limited range of momenta. However, statistically significant differences indicate that the measurements can provide an impetus to new calculations of many body effects in positron-core electrons annihilation.

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Apparatus for positron annihilation-induced Auger electron spectroscopy

Cited by 44 publications

References 7 publications

Positron Annihilation-Induced Auger Electron Spectroscopy Measurements of a TiO₂(110) Surface

Positron Annihilation-Induced Auger Electron Spectroscopy Measurements of a TiO₂(110) Surface

Positrons in surface physics

Gamma Spectra Resulting from the Annihilation of Positrons with Electrons in a Single Core Level

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Apparatus for positron annihilation-induced Auger electron spectroscopy

Cited by 44 publications

References 7 publications

Positron Annihilation-Induced Auger Electron Spectroscopy Measurements of a TiO2(110) Surface

Positron Annihilation-Induced Auger Electron Spectroscopy Measurements of a TiO2(110) Surface

Positrons in surface physics

Gamma Spectra Resulting from the Annihilation of Positrons with Electrons in a Single Core Level

Contact Info

Product

Resources

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Positron Annihilation-Induced Auger Electron Spectroscopy Measurements of a TiO₂(110) Surface

Positron Annihilation-Induced Auger Electron Spectroscopy Measurements of a TiO₂(110) Surface