Soft x-ray spectroscopy in atmospheric pressure helium
- SERC Daresbury Laboratory, Warrington WA4 4AD (United Kingdom)
We report on an environmental chamber, which is attached to a UHV beamline, in which soft x-ray measurements can be done at atmospheric pressure in helium. X-ray measurements in air can only be performed at energies above about 3 keV because of the strong absorption of soft x rays by oxygen and nitrogen. However, a low-{ital Z} scatterer such as helium has a long absorption length for soft x rays even at atmospheric pressure. Thus, this new chamber allows soft x-ray experiments to be performed on samples with physical properties that are incompatible with UHV conditions, e.g., liquid and frozen aqueous solutions, corrosive materials, etc. A helium-tight tank has been installed behind the vacuum experimental chamber of the double crystal beamline 3.4 at the Daresbury SRS. The tank is purged with helium at atmospheric pressure and the gas in the tank is isolated from the high vacuum of the rest of the beamline by a thin mylar window which is supported on a capillary array. The tank contains a sample stage, two ionization chambers and a parallel-plate gas proportional counter for fluorescence detection of dilute samples, which has produced good results on the {ital K} edges of Cl, S, and P.
- OSTI ID:
- 5646965
- Journal Information:
- Review of Scientific Instruments; (United States), Vol. 63:1; ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
Similar Records
XAFS Measurement System for Nano, Bio and Catalytic Materials in Soft X-ray Energy Region
The beamline ID32 at the ESRF for soft X-ray high energy resolution resonant inelastic X-ray scattering and polarisation dependent X-ray absorption spectroscopy
Related Subjects
SYNCHROTRON RADIATION SOURCES
X-RAY SPECTROMETERS
DESIGN
MEASURING METHODS
SOFT X RADIATION
VACUUM SYSTEMS
X-RAY SOURCES
ELECTROMAGNETIC RADIATION
EQUIPMENT
IONIZING RADIATIONS
MEASURING INSTRUMENTS
RADIATION SOURCES
RADIATIONS
SPECTROMETERS
X RADIATION
X-RAY EQUIPMENT
430303* - Particle Accelerators- Experimental Facilities & Equipment