Ultra-soft X-ray absorption

Evaluation of Laboratory Ultra-Soft X-Ray Absorption Spectrometer by Li-K XANES Measurements and Their DV-Xa Calculations... 

Abstract We have built a novel laboratory ultra-soft X-ray absorption (USXA)... 

Inner shell absorption spectroscopy provides a map of unoccupied electronic states (or levels) and the electronic structures of conduction bands in the vicinity of the core-excited atom. The X-ray absorption spectroscopy (XAS) represents a fingerprint of the chemical state of the element. It provides useful means of nondestructive site-dependent chemical analysis of complex systems. Ultra-soft X-ray absorption (USXA) method is categorically interesting for chemical analysis of a variety of complex materials in battery industry, environmental science, and semiconductor industry. 

Evaluation of Laboratory Ultra-Soft X-Ray Absorption Spectrometer... 

The absorption of the Mj y and N,v y transitions are located in the soft X-ray range ( 800-1700 eV) and in the ultraviolet ( —98-205 eV), respectively. In the early period of X-ray spectroscopy, such absorption measurements, in particular those in the ultraviolet, were hampered by the low intensities emitted from conventional X-ray sources, by the difficulty of preparing thin (— 100 A) uncontaminated samples of defined thickness, and by the involved detection systems. Meanwhile most of these experimental problems have been overcome through the availability of intense and tunable synchrotron sources, the concomitant improvements of the detection systems (e.g., total electron yield detectors) and through developments of appropriate ultra high vacuum preparation techniques. Nevertheless, because of possible intrinsic surface effects, the question of whether one measures bulk properties remains a drawb k here. 

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