Photoelectric yield of the potassium halides in the photon energy range 10 to 35 eV

Blechschmidt, D.; Skibowski, M.; Steinmann, W.

doi:10.1016/0030-4018(70)90109-4

Cited by 29 publications

(6 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This multiplication has been observed as an enhancement in the yield of the intrinsic luminescence, 22,23 and as a reduction of the photoemitted electrons in total yield spectra. 24,25 When increasing the photon energy, the excited electrons gain enough kinetic energy to start a series of scattering processes at values 2E th ͑E ex ϩE g ͒ and 2E g , where E th is the photon energy of the desorption yield onset and E ex the photon energy at which the exciton absorption peak occurs. These threshold energies are summarized in Table I.…”

Section: A General Shape Of the Spectramentioning

confidence: 99%

“…While valence-band excitations directly produce energetic electrons, core exciton excitations produce energetic electrons through the decay processes such as direct recombination or Auger decay. 24,25 The high efficiency of these decay processes is shown by the presence of prominent peaks in the total photoelectron yield at photon energies where core excitons occur. 24,25 Attempts to determine the nature of the decay mechanism have brought only qualitative answers, showing that the specific decay process depends on the detail of the electronic structure of the crystal.…”

Section: B Fine Structure Of the Yield Spectramentioning

confidence: 99%

“…24,25 The high efficiency of these decay processes is shown by the presence of prominent peaks in the total photoelectron yield at photon energies where core excitons occur. 24,25 Attempts to determine the nature of the decay mechanism have brought only qualitative answers, showing that the specific decay process depends on the detail of the electronic structure of the crystal. 25,33,34 If the decay of a core exciton produces electrons with not enough kinetic energy for undertaking a scattering sequence, a reduction of the desorption yield should be observed.…”

Section: B Fine Structure Of the Yield Spectramentioning

confidence: 99%

See 2 more Smart Citations

Spectroscopic behavior of halogen photodesorption from alkali halidesunder UV and VUV excitation

et al. 1997

View full text Add to dashboard Cite

The photostimulated desorption yield of neutral halogen atoms from KI, KBr, and RbI at several temperatures has been measured in the photon energy range between 5 and 30 eV using synchrotron radiation and quadrupole mass spectrometry. The features observed in the desorption yield are slightly correlated with the structures of the absorption spectra of each investigated material. The behavior of the halogen desorption yield is analyzed in the frame of inelastic electron-electron scattering processes, in close analogy with data available from the total photoelectron yield and the luminescence yield. The role played in the desorption mechanism by fundamental excitations, such as valence exciton creation and band-gap electron-hole excitation, is discussed.

show abstract

Section: A General Shape Of the Spectramentioning

confidence: 99%

Section: B Fine Structure Of the Yield Spectramentioning

confidence: 99%

Section: B Fine Structure Of the Yield Spectramentioning

confidence: 99%

See 1 more Smart Citation

Spectroscopic behavior of halogen photodesorption from alkali halidesunder UV and VUV excitation

et al. 1997

View full text Add to dashboard Cite

show abstract

“…Electron affinities are either evaluated as the difference between E g and IP or via curve fitting as in refs , . The result by Blechschmidt et al was excluded since the authors consider this value as not very accurate. The remaining EAs are between 0.2 and 0.6 eV, with the latest experiments yielding the higher value of 0.6 eV.…”

Section: Results and Discussionmentioning

confidence: 99%

“…To assess the quality of our computational setup, we compare the calculated electronic properties to experimental values. − The absolute values of the calculated VBM and CBM are only given for the KCl(100) surface, as the vacuum reference is undefined in bulk calculations. Experimental electronic structure data for KCl obtained from an extensive literature search are provided in Table .…”

Section: Results and Discussionmentioning

confidence: 99%

Chemistry with F Centers: Reduction of Organic Molecules on the Defective Potassium Chloride(100) Surface

2020

View full text Add to dashboard Cite

The local electronic structure and the resulting reactivity of crystalline surfaces are significantly influenced by the presence of defect centers. The most prominent type of point defects of alkaline-earth halides is the so-called F center, an isolated neutral halide vacancy where the remaining electron is localized at the defect site. In an earlier study [Chen, W.; Tegenkamp, C.; Pfnur, H.; Bredow, T., Phys. Rev. B, 2009, 79, p. 235419.], it has been demonstrated that the defect electron located in NaCl(100) surface F centers can be transferred to adsorbed salicylic acid. In this study, we extend this study to the KCl(100) surface and a wider variety of adsorbed organic molecules to reveal the general trends for this charge transfer. The adsorbed molecules comprise both aromatic annulenes and heteroaromatic systems as well as substituted hydrocarbons. As expected, the tendency toward charge transfer is in line with the molecular electron affinity (EA). However, even adsorbates with a negative EA up to −1.76 eV are reduced due to the strong electrostatic interaction with the defective surface. In particular, the lowest unoccupied orbitals of the adsorbed molecules are lowered near the F center so that electron transfer from the surface defect is facilitated. In some cases, partial electron transfer and mixing of molecular and defect orbitals are observed. In halogenated molecules like dichloromethane, 2,3,7,8tetrachlorodibenzodioxin, or chlorobenzene, halogen bond dissociation and a subsequent healing of the surface defect occur.

show abstract

Photoemission from the potassium halides in the photon energy range 7 to 30 eV

Blechschmidt¹,

Skibowski²,

Steinmann³

1970

Physica Status Solidi (b)

Self Cite

View full text Add to dashboard Cite

The spectral distribution of the photocurrent at different retarding potentials as well as the energy distribution of the photoelectrons a t a fixed photon energy have been measured for all potassium halides. The synchrotron radiation of DESY was used as a light source. The samples were thin films evaporated under ultra-high vacuum. The threshold energy, the distance between the valence band and the K+3p core level, and the position of the Fermi level have been determined. The onset of electron-electron scattering and the appearence of inelastically scattered electrons in the photoemission has been demonstrated. The decay of the core excitons has been investigated. The core exciton structure in the spectra of the photoyield is due t o direct recombination. There is some evidence that a n Auger process occurs as additional decay mechanism.Die Spektralverteilung des Photostroms bei verschiedenen Retardierungspotentialen sowie die Energieverteilung der Photoelektronen zu fester Photonenenergie wurden fur alle Kaliumhalogenide gemessen. Als Lichtquelle diente die Synchrotronstrahlung von DESY. Als Proben wurden dunne, im Ultrahochvakuum aufgedampfte Schichten verwendet. Die Grenzwellenlange, der energetische Abstand zwischen dem Valenzband und dem K+3p-Rumpfniveau sowie die Lage des Ferminiveaus wurden bestimmt. Der Einsatz der Elektron-Elektron-Streuung und das Auftreten von unelastisch gestreuten Elektronen in der Photoemission wurden nachgewiesen. Der Zerfall der Rumpfexzitonen wurde untersucht.

show abstract

Photoelectric yield of the potassium halides in the photon energy range 10 to 35 eV

Cited by 29 publications

References 25 publications

Spectroscopic behavior of halogen photodesorption from alkali halidesunder UV and VUV excitation

Spectroscopic behavior of halogen photodesorption from alkali halidesunder UV and VUV excitation

Chemistry with F Centers: Reduction of Organic Molecules on the Defective Potassium Chloride(100) Surface

Photoemission from the potassium halides in the photon energy range 7 to 30 eV

Contact Info

Product

Resources

About