Application of the Graphite Monochromator to Light Element X-Ray Spectroscopy

Abstract

The use of highly oriented graphite as a monochromator was recently discussed by Sparks, and has been found to be highly suitable for light-element ( Z⩾15) x-ray spectroscopy. This paper compares the diffracting power of the graphite monochromator with ethylenediamine- d-tantrate and LiF.

EXAFS Spectroscopy by Continuum Soft X-ray Emission from a Short Pulse Laser-produced Plasma

“…However, it does have an inherently low collection efficiency which can only be improved by placing the crystal very close to the source and this can place unacceptable physical restrictions on the experimental geometry. We have, however, recorded spectra with a plane spectrograph using an Gould et al (1968) and Gilfrich et al (1975) "- EDDT (ethylene diamine dihydrogen tartrate) crystal (see Table 1). Around 50 laser pulses, each of 2 J, were needed to obtain sufficient film exposure to record aluminium K-edge EXAFS spectra (see Section 3).…”

L-Subshell Fluorescence Yields for Silver and Tellurium

“…4 The full width at half-maximum resolution of these crystals in first order for the intense La transition in silver and tellurium is 65 and 110 eV, respectively. In second order the resolution for the tellurium line is reduced to only 40 eV.…”

X-ray absorption and emission

“…A mosaic of hundreds of small LiF crystals were used in an X-ray telescope to concentrate parallel X-rays onto a small detector (828). Monochromators composed of highly oriented graphite look very promising in the long wavelength region (198). The graphite compares favorably to EDDT and LiF with good reflectivity but broad lines.…”

“…The development of thermography in the USSR has been reviewed ( 23). The application of DTA and TGA to high polymers also has been the subject of a recent review (198).…”