Soft x-ray spectroscopy in atmospheric pressure helium

Journal Article · Wed Jan 01 04:00:00 EST 1992 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1143048· OSTI ID:5646965

Roper, M D; van der Laan, G; Flaherty, J V; Padmore, H A ^[1]

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1. 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), Journal Name: Review of Scientific Instruments; (United States) Vol. 63:1; ISSN RSINA; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
DESIGN
ELECTROMAGNETIC RADIATION
EQUIPMENT
IONIZING RADIATIONS
MEASURING INSTRUMENTS
MEASURING METHODS
RADIATION SOURCES
RADIATIONS
SOFT X RADIATION
SPECTROMETERS
SYNCHROTRON RADIATION SOURCES
VACUUM SYSTEMS
X RADIATION
X-RAY EQUIPMENT
X-RAY SOURCES
X-RAY SPECTROMETERS