The influence of defects and defect clusters on alkali atom desorption stimulated by low energy electron bombardment of alkali halides

Seifert, N.; Ye, H.; Tolk, N. H.; Husinsky, W.; Betz, G.

doi:10.1016/0168-583x(94)95706-1

Cited by 19 publications

(8 citation statements)

References 20 publications

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“…This result clearly demonstrates that one of the origins of the desorption process in alkali halides is the decay of the fundamental exciton that is known to occur through the production of F and H centers, which are considered precursor states for alkali and halogen desorption, respectively. 10,20 ͑b͒ At higher photon energy, corresponding to the interband transitions region and to the first core-level excitation, the yield spectra of halogen emission is almost independent of the variation of the absorption coefficient of alkali halides, as is evident by comparing the absorption and yield curves in Figs. 1-3.…”

Section: A General Shape Of the Spectramentioning

confidence: 76%

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

et al. 1997

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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.

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Section: A General Shape Of the Spectramentioning

confidence: 76%

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

et al. 1997

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“…The rate of energy dissipation as a function of penetration for low-energy electrons in AHs has been investigated by several authors. 16 The electron energy distribution along the penetration depth is not a constant. Several computations showed that, for a given material, it is possible to construct a universal simplified curve of energy deposition versus penetration.…”

Section: Lif ®Lms Grown On Crystalline Substratesmentioning

confidence: 99%

Micro and sub‐micro fabrication techniques for optically confined structures based on lithium fluoride

Montereali

Mancini

Martelli

et al. 2001

Applied Organom Chemis

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Lithium fluoride (LiF) films treated by lowenergy electrons represent a very promising candidate for the realization of miniaturized broad band optical devices like active waveguides and microcavities. The main properties, in particular the refractive index, density, structure and microstructure, of polycrystalline LiF films grown by thermal evaporation on amorphous and crystalline substrates are discussed, together with their influence on colour centres formation induced by low-energy electron beam bombardment and on the choice of the main irradiation conditions.

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“…This lineshape explains the presence of a long tail extending towards long wavelengths, at the origin of the intense red hue of villiaumite. Such a Lorentzian line-shape characterizes the optical spectra of free neutral Na clusters (Selby et al, 1991), Na nanoparticles in NaCl (Seinen et al, 1994) and NaF (Seifert et al, 1994) or Ca nanoparticles in CaF 2 (Ruiz-Fuertes et al, 2019;Ryskin et al, 2020).…”

Section: Optical Absorption Spectra Of Villiaumitementioning

confidence: 99%

“…The two minor contributions at 328 nm and 414 nm have a Gaussian lineshape. The former corresponds to a F-center, widely investigated in synthetic NaF (Seifert et al, 1994;Tiwald et al, 2015;Hoya et al, 2017). The latter may be assigned to a R-center (Amenu- Kpodo and Neubert, 1965;Bryukvina and Martynovich, 2012;Bryukvina et al, 2018).…”

Section: Optical Absorption Spectra Of Villiaumitementioning

confidence: 99%

Sodium nanoparticles in alkali halide minerals: Why is villiaumite red and halite blue?

Calas

Galoisy

Geisler

2021

American Mineralogist

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The presence of metal Na nanoparticles causes the bright, thermally unstable colors of villiaumite, NaF, and halite, NaCl. These nanoparticles have been suspected since a long time to be caused by external irradiation. Metal nanoparticles, often referred to as metal colloids, cause surface plasmon resonance effects, characterized by a single Lorentzian-shaped absorption band.The color of these minerals is due to metal Na nanoparticles of 2.5-3 nm. A key point is that the resonance wavelength, which corresponds to the maximum of the absorption band, is inversely related to the value of the refractive index of the embedding mineral. This causes the position of the main absorption band to be offset downwards by 140 nm in halite relative to villiaumite. As a consequence, the optical transmission window is shifted from the long to the short wavelength domain, explaining the color of blue halite and red villiaumite, respectively. Similar refractive This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America.The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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The influence of defects and defect clusters on alkali atom desorption stimulated by low energy electron bombardment of alkali halides

Cited by 19 publications

References 20 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

Micro and sub‐micro fabrication techniques for optically confined structures based on lithium fluoride

Sodium nanoparticles in alkali halide minerals: Why is villiaumite red and halite blue?

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