Photon stimulated desorption

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August undefined, 2024

WebPhoton-stimulated desorption of F/sup +/ from Si(111) was studied with use of photon energies in the region of the Si 2p core level. Fluorinated surfaces with variable amounts of SiF/sub x/ groups were prepared, and distinct photon-stimulated--desorption thresholds in the Si 2p region were observed for F/sup +/ desorption from SiF vs SiF/sub 3/ surface … WebDec 1, 2011 · Adsorption behavior of atomic deuterium on a hexagonal boron nitride (h-BN) thin film is studied by photon-stimulated ion desorption (PSID) of D + and near edge X-ray absorption fine structure (NEXAFS) at the B and N K-edges.After the adsorption of atomic deuterium, D + desorption yield η(hν) shows clear enhancement at the B K-edge and …

Electron-Stimulated Desorption - NIST

WebMay 19, 2006 · Photon-stimulated desorption is a powerful tool to study fundamental processes in adsorbate-surface systems, as well as to achieve selective surface reactions for controlled surface processing (1–4).Photons are easily directed and tuned in energy to induce transitions in atomic and molecular states, with high spatial and temporal precision. Web5]; lowering the photon and electron stimulated gas desorption yields [6, 7] was achieved by having a denser layer at the interface [8]. It was also found that the non-activated or CO saturated NEG coating can be activated by synchrotron radiation (SR) or electron bombardment. The selective pumping of NEG coating is a performance can cranberry juice change urine color

Photon-stimulated desorption and other spectroscopic studies of …

WebJul 18, 2024 · However, current estimates of sulfur desorption from Mercury's surface based on solar wind sputtering and micrometeorite impact vaporization underestimate the … WebApr 1, 2013 · X-ray photon-stimulated desorption of ions from semiconductor surfaces has been studied in detail by use of synchrotron radiation with photon energies between 2.8 and 12 keV. The excitation ... WebFeb 27, 2007 · The photon-stimulated desorption (PSD) of O+ ions from the alpha-oxygen phase on Mo(100) has been monitored through and above the Mo L1(2s) absorption edge (2866 eV) and is compared to the ... fish maw collagen

Photon stimulated desorption from a vacuum chamber at the …

(PDF) Photon stimulated desorption processes including …

WebFeb 20, 2024 · Abstract. Photo-stimulated desorption (PSD) is desorption of adsorbed molecules from surfaces induced by photon irradiation. PSD occurs either in thermal or … WebSynchrotron radiation at the Synchrotron Ultraviolet Radiation Facility at the National Bureau of Standards has been employed to study the adsorption of oxygen on a Ti(001) surface using photon-stimulated desorption (PSD), electron-stimulated desorption (ESD), and ultraviolet photoemission spectroscopy (UPS). The dominant ESD and PSD products … can cranberry juice help bladder infectionsWebNEG coating can reduce drastically the Photon Stimulated Desorption (PSD) effect [3], hence the conditioning time. At SOLEIL, in addition to the standard pumps, the use of NEG coating has been implemented in an extensive way to all the aluminium straight vacuum vessels of the storage ring that means quadrupole/sextupole type and can cranberry juice irritate the bladder

"WebMay 15, 1984 · Photon stimulated desorption (PSD) refers to the ejection of ions, atoms, or molecular fragments from a surface initiated by the adsorption of single photons; to date, most studies have concentrated on the detection of ions. The properties of PSD which make it attractive as a surface characterization tool are its extreme surface sensitivity ... " - Photon stimulated desorption

Photon stimulated desorption

WebJun 29, 2024 · The strong temperature dependence is attributed to competition between thermal desorption of the primary photoproduct and secondary photochemical steps. The aldehyde, isobutanal, is the primary photoproduct of isobutanol. ... (110) including temperature-programmed desorption of H 2 O and photon-stimulated desorption of O 2; ... WebPhoton stimulated desorption PSD studies using synchrotron radiation are providing new insights into fundamental electronic excitation processes at surfaces. Mechanisms for …

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WebIn earlier experiments on the X-ray photon energy dependence of the F-centre yield by monochromatic X-rays, a step was found at the ClK edge in the yield of the F centres in KC1 [29]. ... approaches Walkup and Avouris 1331 have used molecular dynamics to follow the transient motions associated with stimulated desorption in an approach mak- ing ...

WebJul 18, 2024 · However, current estimates of sulfur desorption from Mercury's surface based on solar wind sputtering and micrometeorite impact vaporization underestimate the observed abundances. Solar photons can also eject volatile species through a process known as photon-stimulated desorption (PSD) where photons with enough energy can … WebJan 31, 2001 · Not only does it provide distributed pumping but also reduces the photon and electron stimulated desorption (PSD and ESD) yields [6] [7][8], which allows reduction of the number of pumps and their ...

WebOct 1, 2024 · The thermal outgassing of NEG coated chamber is negligible, and the photon or electron stimulated desorption significantly decreases. A typical getter coating film composed of titanium (Ti), zirconium (Zr) and vanadium (V) has a low activation temperature of 180 °C (for 24 h) [ 1 , 6 ], and so the activation temperatures for NEG films … WebOct 1, 2024 · The thermal outgassing of NEG coated chamber is negligible, and the photon or electron stimulated desorption significantly decreases. A typical getter coating film …

WebJul 13, 2001 · Photon stimulated desorption (PSD) from KEKB factory copper chambers was measured at the National Synchrotron Light Source (NSLS), located at the Brookhaven Laboratory. The KEKB is an asymmetrical collider recently constructed in Ibaraki, Japan. The collider utilizes two UHV ring chambers, one for a 3.5 GeV positron beam and the other for …

WebThe Workshop on Desorption Induced by Electronic Transitions (DIET) took place May 12-14, 1982, in Williamsburg, Virginia. The meeting brought together, for the ... workers in the fields of electron and photon stimulated desorption from surfaces, as well as many workers in related fields, including ... sputtering, gas-phase photodissociation ... can cranberry juice constipate youWebPhoton-stimulated desorption (PSD) from the walls of electron storage rings and associated beamlines imposes serious limits on their beam quality and beam lifetimes. Stainless … can cracks in concrete be fixedWebrect, wavelength-dependent desorption mechanism is in-volved in the photon-stimulated emission of neutral, excited-state hydrogen from these systems: viz. a resonant, valence … can cranberry pills help urethritisWebJun 2001 - Present21 years 8 months. Daresbury, Warrington, Cheshire, UK. - Design and operation of Particle Accelerator Vacuum Systems and Large Vacuum Systems. - Vacuum gas dynamics modelling. - Outgassing of different materials in vacuum. - Photon, electron and ion stimulated desorption. - Non-evaporable getter coatings. fish maw for saleWebAug 12, 1999 · The measurement scheme for photon-stimulated desorption (PSD) of Na atoms includes a mechanically chopped photon source (500-W Hg arc lamp with filters), a … fish maw extractWebWe report photon-stimulated desorption (PSD) of ions by the same core-hole Auger-decay mechanism observed in electron-stimulated desorption (ESD). Ions desorbed by synchrotron radiation were identified by time-of-flight mass spectroscopy. The thresholds for the PSD and ESD of H +, O H +, and F + from Ti O 2 are identical. The PSD excitation ... fish maw corn soupWebSynchrotron radiation at the Synchrotron Ultraviolet Radiation Facility at the National Bureau of Standards has been employed to study the adsorption of oxygen on a Ti(001) surface … fish maui charter