Apparatus and method for X-ray absorption spectroscopy

US6212253A · kind A · utility

Assignee

• Max-Planck-Gesellschaft · DE

Inventors

• Thomas Schedel-Niedrig · Berlin, DE
• Axel Knop-Gericke · Berlin, DE
• Michael Havecker · Berlin, DE

Key dates

• Filing date: Mar 11, 1999
• Grant date: Apr 3, 2001
• Expiry date: Mar 11, 2019

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N23/083
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In order to investigate the reactants involved in a reaction between a gas and a solid by means of X-ray absorption spectroscopy an apparatus is provided which comprises, within a measuring chamber (2), a sample holder (23) for holding a sample (24) of the solid, means for forming an atmosphere of the gas in the measuring chamber under selectable pressure, a window (20) for the entry of X-rays for the irradiation of the sample (24) and a collector arrangement (21, 22) arranged spaced from the sample holder (23), in order to collect in the measuring chamber (2) electrons released by X-ray absorption. The collector arrangement comprises two collector electrodes (21 and 22) which are arranged mutually spaced from one another in sequence lengthwise along the X-ray path between the window (20) and the sample holder (23). Each collector electrode (21, 22) and the sample holder (23) have respective connection means (31, 32, 33) for the connection of each to a respective associated predetermined potential and for the separate measurement of the currents (I.sub.1, I.sub.2, I.sub.3) flowing through these connections. By evaluation of these currents evidentially helpful spectra of the involve…