Core-level electron–electron coincidence spectroscopy

Haak, H. W.; Sawatzky, G. A.; Ungier, L.; Gimzewski, James K.; Thomas, T. D.

doi:10.1063/1.1137823

Cited by 68 publications

(14 citation statements)

References 13 publications

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“…By DES one can study the time evolution of a core hole excited state on a timescale given by the natural lifetime of the core hole. These types of measurements have been reported for atoms (Eberhardt et al 1978), simple gas phase molecules using synchrotron radiation for the excitation (Eberhardt et al 1983 or by electron-electron coincidence measurements (Haak et al 1984;Ungier and Thomas 1983), but Loubriel et al (1981) were the first to appreciate the potential of DES for the investigation of an adsorbate system, namely CO on Pt(lll) (see also Johnson et al 1983).…”

Section: Introductionmentioning

confidence: 99%

Deexcitation Electron Spectroscopy: A Probe for the Localisation of Valence Wavefunctions in Free and Adsorbed Molecules

Eberhardt¹,

Plummer²,

Chen³

et al. 1986

Aust. J. Phys.

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Deexcitation electron spectroscopy (DES) is the measurement of the kinetic energy distribution of electrons emitted in the decay of highly excited states of molecules formed by core to bound resonant photon absorption. This spectroscopy has the potential of becoming a new probe of the localised properties of the valence electronic states in molecules as well as furnishing new insights into the dynamics of the electronic decay and screening processes. This paper describes the basic principles of DES by following the evolution of the DES spectra in CO, from the isolated CO molecule in the gas phase, through the transition metal carbonyls, to CO adsorbed on a surface. In all three cases the energetics, intensities and dynamics of DES will be compared with photoelectron spectroscopy (PES) and Auger electron spectroscopy (AES).

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Section: Introductionmentioning

confidence: 99%

Deexcitation Electron Spectroscopy: A Probe for the Localisation of Valence Wavefunctions in Free and Adsorbed Molecules

Eberhardt¹,

Plummer²,

Chen³

et al. 1986

Aust. J. Phys.

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“…The various peaks in the spectra correspond to different atomic terms, reflecting the possible transitions between the M4,5 and L2,3 levels. The most significant difference is that our data were collected with a resolution of 3·5 eV, while Haak et al (1984) used a resolution of 0·2 eV.…”

Section: Results For Cu and Comentioning

confidence: 99%

“…Perhaps the most impressive illustration of the power of the APECS experiment was given by Haak et al (1984) who looked at a number of transition metals and alloys. They were able to show that one could isolate the satellite contribution to the L3 VV component in Cu.…”

Section: Previous Workmentioning

confidence: 99%

“…We have constructed an APECS spectrometer similar to that of Haak et al (1984), except that it uses purpose built spectrometers. These differ from conventional analysers in that they use tilted multichannel plates (MCP) to correct for the time-of-flight spreading that is caused by the passage of the electrons through the analysers.…”

Section: Instrumentationmentioning

confidence: 99%

“…The statistical accuracy of the final estimate of the number of true counts is therefore dependent on the accuracy of the background determination. Haak et al (1984) used a pair of conventional electron spectrometers and a monochromatised Al Koc X ray tube to perform their experiments. As such, their equipment was limited by the inherent performance of both analysers.…”

Section: Instrumentationmentioning

confidence: 99%

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Auger Photoelectron Coincidence Spectroscopy

Thurgate¹

1990

Aust. J. Phys.

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Auger photoelectron coincidence spectroscopy (APECS) involves measuring an Auger line in coincidence with the corresponding photoelectron line of an X ray excited spectrum. Such spectra are free of many of the complicating features of conventional data and display the correlations that exist between the lines. APECS has been used to study a number of fundamental aspects of Auger spectroscopy, such as the removal of complicating effects due to Coster-Kronig transitions in the LZ.3 VV spectra of Cu. We have been able to show similar behaviour in the Auger spectra of Co. In principle, APECS can also be used to make measurements of surface core level shifts, to examine the process of electron scattering in solids, and it holds some promise as a technique for the routine examination of materials. The coincidence technique discriminates against secondary electrons in the background, the Auger and photoelectron peaks appear on a flatter background, and this helps to make the interpretation of Auger data collected in coincidence more straightforward. A number of successful APECS experiments have been constructed, using either X ray tubes or synchrotrons as sources. When an X ray tube is used as a source, the principal problem has been with the length of time needed to acquire a sufficient number of counts. We have recently completed construction of a novel spectrometer that goes someway towards overcoming this problem, however the challenge still remains to produce an instrument that will permit routine measurement of these features.

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