Hartree-Slater subshell photoionization cross-sections at 1254 and 1487 eV

Scofield, J. H.

doi:10.1016/0368-2048(76)80015-1

Cited by 5,617 publications

(1,508 citation statements)

References 20 publications

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“…Using Scofield cross sections [14], this corresponds to an atomic C1/Rh ratio of approximately 3.5 ___ 0.5, in reasonable agreement with the expected stoichiometry.…”

Section: The Rhc13"xh20 Catalyst Precursorsupporting

confidence: 70%

Preparation of a rhodium catalyst from rhodium trichloride on a flat, conducting alumina support studied with static secondary ion mass spectrometry and monochromatic X-ray photoelectron spectroscopy

1993

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“…Using Scofield cross sections [14], this corresponds to an atomic C1/Rh ratio of approximately 3.5 ___ 0.5, in reasonable agreement with the expected stoichiometry.…”

Section: The Rhc13"xh20 Catalyst Precursorsupporting

confidence: 70%

Preparation of a rhodium catalyst from rhodium trichloride on a flat, conducting alumina support studied with static secondary ion mass spectrometry and monochromatic X-ray photoelectron spectroscopy

1993

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“…103.5 eV, with a width at half-maximum of 2.4 eV, similar to results from the literature for pure silica. 23,28,29 All the samples had the XPS spectrum of the O 1s level at 530.6 and 532.4 eV, with full width at half-maximum of 2.2 and 2.3 eV, attributed to the oxygens present in SiO 2 28,29 and in CeO 2 , 30 respectively.…”

Section: Characteristics Of the Samplesmentioning

confidence: 99%

Phosphoric acid adsorbed on silica-ceria matrix obtained by sol-gel method: studies of local structure, texture and acid property

Pissetti

Francisco

Landers

et al. 2007

J. Braz. Chem. Soc.

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Óxidos mistos de SiO 2 /CeO 2 (designados como SC) contendo quantidades variáveis de céria, SC1 = 5,6, SC2 = 8,0 e SC3 = 13,0 (% em massa), foram preparados pelo método de processamento sol-gel e obtidos como sólidos amorfos possuindo áreas superficiais específicas de SC1 = 463, SC2 = 474 e SC3 = 460 m 2 g -1 . Íons fosfatos foram imobilizados na superfície destes sólidos, através da ligação química Ce-O-P, pela imersão de SC em uma solução de ácido fosfórico. Este procedimento produziu sólidos com as seguintes quantidades de P adsorvidas na superfície (em % atômica): SCP1 = 0,60, SCP2 = 0,71 e SCP3 = 1,63. A energia de ligação P 2p 3/2 , obtida por XPS, e o único pico observado em -10 ppm, por NMR de 31 P, revelaram que o fosfato adsorvido na superfície é a espécie H 2 PO 4 -. Utilizando-se piridina como sonda molecular, somente sítios ácidos de Brønsted foram detectados. A determinação das quantidades destes sítios ácidos, feita pela adsorção de NH 3 gasosa sobre a superfície, revelou os seguintes valores para cada sólido tratado com o íon fosfato: SCP1 = 0,37, SCP2 = 0,43 e SCP3 = 0,51 mmol g -1 .SiO 2 /CeO 2 mixed oxide (designated as SC) with variable ceria contents, SC1 = 5.6, SC2 = 8.0 and SC3 = 13.0 wt%, prepared by the sol-gel processing method, were obtained as amorphous solids possessing specific surface areas of SC1 = 463, SC2 = 474 and SC3 = 460 m 2 g -1 . Phosphate ions were immobilized onto the surface of these solids through Ce-O-P bonding by immersing SC into a phosphoric acid solution. Solids with the following P contents were obtained (in atom %): SCP1 = 0.60, SCP2 = 0.71 and SCP3 = 1.63. The binding energy peak P 2p 3/2 at ca. 134.0 eV, observed by XPS, and the 31 P MAS NMR single peak, observed at ca. -10 ppm, revealed that H 2 PO 4 -is the species present on the surface of the matrices. Using pyridine as a molecular probe, only Brønsted acid sites could be detected. The amount of these acid sites, determined by ammonia gas adsorption on the surface, reached the following values for each phosphate-treated solid: SCP1 = 0.37, SCP2 = 0.43 and SCP3 = 0.51 mmol g -1 .

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“…Experimental peaks (recorded with a constant pass energy of 50 eV) were decomposed into theoretical bands (80% gaussian and 20% lorentzian) with a non-linear baseline [14]. Quantitative analyses (carried out with a pass energy of 150 eV) were performed using Scofield [15] factors. The transmission T of the spectrometer and the electron mean free path λ are given by the following equation: λT = E k 0.7 where E k is the kinetic energy of the photoelectron.…”

Section: Characterizationmentioning

confidence: 99%

LPCVD and characterization of boron-containing pyrocarbon materials

Jacques

Guette

Bourrat

et al. 1996

Carbon

148

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Pyrocarbon materials containing various amounts of boron have been prepared by LPCVD from BCl 3 -C 3 H 8 -H 2 precursor mixtures. The growth rate is increased with respect to pure pyrocarbon deposition. By increasing BCl 3 / (C 3 H 8 + BCl 3 ) ratio up to 85%, the incorporation of boron can reach 33 at.%. A small amount of boron (e.g. 8 at.%) highly enhances the anisotropy of pyrocarbon, as evidenced by optical microscopy, X-ray diffraction and transmission electron microscopy (selected area diffraction and lattice fringes techniques). X-ray photoelectron spectroscopy has shown that a large fraction of the boron atoms are included by substitution in the carbon layers, the remaining boron atoms belongs to a boron-rich amorphous part of the material. As boron content increases beyond 8 at.%, the anisotropy of the boron-rich pyrocarbon decreases, due to the limited growth and stacking of the carbon layers. Also, amorphous boron-rich regions are more and more abundant as the total amount of boron increases. The oxidation resistance of the C(B) materials is better than that of pure pyrocarbon. It is mainly due to the improvement of the structural organization for the low boron content materials and to the coating of the whole material with a stable boron oxide for materials with a higher boron content.

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Hartree-Slater subshell photoionization cross-sections at 1254 and 1487 eV

Cited by 5,617 publications

References 20 publications

Preparation of a rhodium catalyst from rhodium trichloride on a flat, conducting alumina support studied with static secondary ion mass spectrometry and monochromatic X-ray photoelectron spectroscopy

Preparation of a rhodium catalyst from rhodium trichloride on a flat, conducting alumina support studied with static secondary ion mass spectrometry and monochromatic X-ray photoelectron spectroscopy

Phosphoric acid adsorbed on silica-ceria matrix obtained by sol-gel method: studies of local structure, texture and acid property

LPCVD and characterization of boron-containing pyrocarbon materials

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