Chemical Environment Effects on Kβ/Kα Intensity Ratio: An X-ray Fluorescence Experiment on Periodic Trends

AbstractThe intensity ratios of HCO+/HCN and HNC/HCN (1-0) reveal the relative influence of star formation and active galactic nuclei (AGN) or black holes on the circum-nuclear gas of a galaxy, allowing the identification of X-ray dominated regions (XDRs) and Photon-dominated regions (PDRs). It is not always clear in the literature how this intensity ratio calculation has been, or should be performed. This paper discusses ratio calculation methods for interferometric data.

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The influence of the chemical environment on the X-ray rate in the X-ray fluorescence of rock samples

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms ◽

10.1016/0168-583x(89)91064-1 ◽

1989 ◽

Vol 40-41 ◽

pp. 635-637 ◽

Cited By ~ 1

Author(s):

Robert Wood ◽

C.A. Quarles

Keyword(s):

Chemical Environment ◽

X Ray ◽

Rock Samples

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On the prediction of core level binding energies in molecules, surfaces and solids

Physical Chemistry Chemical Physics ◽

10.1039/c7cp08503f ◽

2018 ◽

Vol 20 (13) ◽

pp. 8403-8410 ◽

Cited By ~ 16

Author(s):

Francesc Viñes ◽

Carmen Sousa ◽

Francesc Illas

Keyword(s):

Photoelectron Spectroscopy ◽

State Of The Art ◽

Binding Energies ◽

Core Level ◽

Chemical Environment ◽

X Ray ◽

Unique Information

Core level binding energies, measured by X-ray photoelectron spectroscopy providing unique information regarding the chemical environment of atoms in a system, can be estimated by a diversity of state-of-the-art accurate methods here detailed.

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CHEMICAL ENVIRONMENT EFFECTS ON CREEP FRACTURE

Fracture 84 ◽

10.1016/b978-1-4832-8440-8.50404-x ◽

1984 ◽

pp. 3753-3772

Author(s):

B.F. Dyson ◽

E.D. Hondros

Keyword(s):

Chemical Environment ◽

Creep Fracture ◽

Environment Effects

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The Use of the Conventional Isolated Atom Model for the Theoretical Calculation of the Dependence of Lβ/Lα: Intensity Ratio on the Sample Exit Angle for Unoxidized and Oxidized Transition Metal Alloy Thin Films

Advances in X-ray Analysis ◽

10.1154/s0376030800013057 ◽

1991 ◽

Vol 35 (B) ◽

pp. 845-850

Author(s):

Francis Fujiwara ◽

George Andermann

Keyword(s):

Thin Films ◽

Transition Metal ◽

Fluorescence Spectroscopy ◽

Intensity Ratio ◽

Exit Angle ◽

Absorption Coefficients ◽

Theoretical Formulation ◽

Transition Metal Alloy ◽

X Ray ◽

Transition Metal Surfaces

Variable sample exit angle x-ray fluorescence spectroscopy (VEA-XRF) employing the Lβ/Lα intensity ratio for transition metals and their oxides has been shown to be useful for non-destructively studying transition metal surfaces and oxidation, as well as, superconductors. Thus the theoretical formulation of the Lβ/Lα intensity ratio dependence on the sample exit angle, θe, is of some interest and we develop it here. We also present methods of obtaining parameters needed in the formulation, such as Lβ absorption coefficients, which are not available in the literature, for wavelengths greater than about 12Å.

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Chemical Environment Effects on the Photophysical Behavior of Two-Photon Materials

MRS Proceedings ◽

10.1557/proc-771-l4.7 ◽

2003 ◽

Vol 771 ◽

Author(s):

Jeremy C. Collette ◽

Aaron W. Harper

Keyword(s):

Solvent Polarity ◽

High Sensitivity ◽

Chemical Environment ◽

Order Moment ◽

Two Photon ◽

Environment Effects ◽

Vis Spectroscopy ◽

Solvatochromic Probes ◽

Photophysical Behavior ◽

Water Absorbance

AbstractA set of six new two-photon engineered diethylamino-substituted styryl pyrazine (DEASP) dyes have been developed as chemically responsive chromophores. This work employs UV/Vis spectroscopy to draw structure-optical property relationships and to quantify the solvatochromic effect observed for these dyes. Absorbance profiles for each of these dyes have been measured in 22 solvents ranging from very nonpolar (TMS) to very polar (water). Absorbance maxima of the longest wavelength π→π transitions have been correlated to nine empirical scales of solvent polarity, and a comparative analysis is presented. Dimroth & Reichardt's and Kamlet & Taft's single parameter scales have been recalculated with spectral data obtained for the six DEASP dyes. The correlation of these established and recalculated scales are shown and discussed. DEASP chromophores are found to exhibit high sensitivity to their chemical environment and exceptional range as solvatochromic probes. Current models of solvatochromism, based on dipolar probes, cannot account for the solvatochromism observed in our quadrupolar dyes, and fail to describe the effect of the chemical environment on this family of twophoton dyes. The need to develop a more universal model of solvation incorporating higher order moment contributions is apparent.

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