Search results

Sort By:

Limit search:

A Comparative Study of the Methods of Speciation Using X-ray Absorption Fine Structure

100%

Gaur A., Shrivastava B.

Acta Physica Polonica A

2012

vol. 121

issue 3

647-652

Determination of the chemical forms along with the relative quantity of the different species in a given sample, termed as speciation, can be done by analyzing X-ray absorption fine structure spectra. The different methods that can be used for speciation are: principal component analysis, target transformation, methods based on derivative spectra, method based on the relative position of the absorption edge, residual phase analysis, normalized difference absorption edge spectra analysis and linear combination fitting. An attempt has been made to make a comparative study of these different methods of speciation by recording the X-ray absorption fine structure at the copper K-edge in a mixture having cuprous oxide and cupric oxide in a specific ratio. The X-ray absorption fine structure spectra of the two oxides have also been recorded separately and the different characteristic X-ray absorption near edge structure features have been identified and their origins have been discussed. Speciation of the mixture has been done using these different methods and the results obtained have been compared and discussed.

L_{1} Absorption Edge of the 4f Heavy Rare-Earth Metals

100%

Shrivastava B., Joshi S.

Acta Physica Polonica A

1992

vol. 81

issue 3

385-392

The wavelengths of the L_{1} absorption edges of the 4f heavy rare-earth metals (^{65}Tb to ^{71}Lu) have been measured using a 40 cm curved crystal spectrograph of the Cauchois-type in the transmission mode. The measured values have been found to fit nicely in the modified Moseley diagrams. The absence of the white lines at the L_{1} edges of the rare earths in metallic form and its occurrence in their compounds has been discussed.

Refine search results

2 Acta Physica Polonica A

1 2012

1 1992

2 Shrivastava B.

1 Gaur A.

1 Joshi S.

Search results

A Comparative Study of the Methods of Speciation Using X-ray Absorption Fine Structure

L_{1} Absorption Edge of the 4f Heavy Rare-Earth Metals