High-luminosity system for XEOL spectroscopy (abstract)

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

DOI:https://doi.org/10.1063/1.1143044· OSTI ID:5410299

Ivanov, S N; Kolobanov, V N; Mikhailin, V V ^[1]

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1. Moscow State University, 117234 Moscow (USSR)

A high-luminosity system comprising optically matched sample chamber, monochromator-spectrograph, and detectors of luminescences has been designed for XEOL spectroscopy using synchrotron radiation. Exciting x-ray radiation penetrated the sample chamber through a window made of a Be foil. The sample is mounted on the sample holder of a nitrogen cryostat. The entrance slit of the monochromator is fixed on the sample's surface. Luminescence is excited and detected at the same side of the sample and optical slit; the angle between the exciting radiation and the entrance shoulder of the monochromator is 45{degree}. Sample chamber has two windows made of a Be foil for incident and transmitted x-ray radiation and another one made of MgF{sub 2} for outcoming luminescence. A Seya--Namioka mounting with 70.5{degree} has been chosen for the spectra instrument as it is characterized by a flat field in the focal surface in the area of the exit slit, providing the possibility to detect luminescence either in the mode of a monochromator or a spectrograph. In the first case it is detected by a photomultiplier with a sodium salicylate screen or a mirror in front of it depending on the spectral range. In the spectrograph a photodetector array is applied. The switching of the modes is achieved by a mirror in front of the exit slit. Changeable diffraction gratings with radius 250 mm and density of grooves per mm 300 and 600 make the instrument efficient in the spectral range 110 to 1400 nm providing resolution up to 1 nm. The sample chamber and the monochromator are separated by a window made of MgF{sub 2}. Vacuum in the sample chamber is better than 10{sup {minus}7} Torr, in the monochromator better than 10{sup {minus}4} Torr. Temperature of the sample can be varied in the range 80--600 K. The level of the scattered light in the instrument is lower than 10{sup {minus}4}.

• OSTI ID: 5410299
• Journal Information: Review of Scientific Instruments; (United States), Vol. 63:1; ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
SYNCHROTRON RADIATION
USES
X-RAY SPECTROSCOPY
BEAM LUMINOSITY
DESIGN
MONOCHROMATORS
PHOTODETECTORS
SAMPLE HOLDERS
BREMSSTRAHLUNG
ELECTROMAGNETIC RADIATION
RADIATIONS
SPECTROSCOPY
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments