X-ray near edge structure

Surface analytical techniques such as Auger electron spectroscopy (27), X-ray photoelectron spectroscopy (28), and secondary-ion mass spectrometry (29) have been used to study LB films. Synchrotron radiation is a particularly powerful probe enabling X-ray near-edge structure and extended X-ray absorption fine structure to be measured. Angle-resolved photoemission studies (30) confirmed the existence of a one-dimensional energy band along the (CH2)jc chain in a fatty acid salt film. 

XANES or X-ray Near Edge Structure is the fine structure very close to an X-ray absorption edge that is mainly dominated by multiple scattering effects. Also called NEXAFS for Near Edge X-ray Absorption Fine Structure. 

The Edge Region. - The X-ray near edge structure, or XANES, may be considered as a combination of two contributions. 

In the purple film, both inclination of EDT-TTF(SCig)2 and disorder in the alkyl chains occurred. The value of the inclination angle of the TTF part was determined to be 24° by IR analysis. Isolated triiodide ions changed to chains, which was confirmed by resonance Raman spectra. The polyiodide anions exist parallel to the substrate from the X-ray near-edge structure, which was consistent with the short interlayer periodicity. 

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