Observation of x-ray resonant Raman scattering: The early days Page: 4 of 14
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possible explanation was that
the broad maximum arose from
bremsstrahlung given off by
deceleration of photoejected L
shell electrons from Ge. The
intensity would start at an
energy shifted down by the
binding of the L shell. The
scattering intensity was angle-
insensitive and unpolarized as
expected of bremsstrahlung.
The resonant character of this
radiation discovered later
removed this possibility.
A Cu single crystal was
placed in the beam because of
concerns about the excess
diffuse scattering of Cu Ka
radiation from Cu-bearing metal
alloys. More intense inelastic
scattering than found in Ge was
observed about 1 keV below
the energy of the incident Cu
Ka x-rays, Fig. 5. The intensity
and energy of the inelastic
scattering features were found
to be insensitive to the
scattering angle O (momentum
transfer); this ruled out
Compton scattering as a
possible source. The energy
of the Compton peak labeled
Ec in Fig. 5 is too close to the
incident energy to be
separated by the energy
resolution of the Si(LOi
detector, - 190 eV at 5.9 keV
This observation on Cu
supported our earlier
suspicions of an excess diffuse
intensity. Perhaps it was to be
a real effect. This inelastic
radiation was not observed in Si
but appeared from Ge and wit
Fig 5 inetasc scatter trom a Cu s ngie
crystal was sNtted afou t reV eo v'*
8 04 Cu K(1 excIng raa)aton Eh, Bott
the intensity an0 energy ioss *as
awiependent ote s woq a C ?h
energy of the ComVton peaR E. teaie 8
with momentu^' transfer and s not
""7 " 9
Fig. 4. X-ray energy spectrum from Ge excited by Cu K. x
rays with enough higher energy subharmonic x rays to
produce the Ge Ka peak. Below the energy of the Cu Ka
radiation is a broad asymmetrical inelastic scattering
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Sparks, C.J. Observation of x-ray resonant Raman scattering: The early days, article, December 31, 1995; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc668529/m1/4/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.