Fluorescence laser exafs

Details Fluorescence laser exafs Fluorescence laser exafs

G - Physics

01

N

358/12

G01N 23/223 (2006.01)

Patent

CA 1192675

FLUORESCENCE LASER EXAFS ABSTRACT Apparatus (10) for obtaining fluorescence laser EXAFS (Extended X-ray Absorption Fine Structure). A lens (12) directs a pulse of radiant energy (13) onto a metal target (15) to produce X-rays (16). A baffle (17) directs the X-rays (16) onto a spectral-dispersive monochromator (18) which directs the spectrally-resolved X-rays (16R) therefrom onto a sample (11). Fluorescence X-rays (27) from the sample (11) strike a phosphor (26) on a grid (19). Emitted light (21) from the phosphor (26) corresponds spatially to the spectral resolution of the X-rays (16R). Emitted light intensity at a point along the spatial distribution corresponds to the absorption character- istics of the sample (11) at a particular wavelength of the incoming X-rays (16R). An imaging lens (20) directs the emitted light (21) onto photographic film or an array detector (22). A reference spectrum of the spectral- ly-resolved X rays (16R) is obtained by placing photo- graphic film or an array detector (29) in the path of the spectrally-resolved X-rays (16R) so that only a portion of the X-rays (16R) throughout the spectrum strikes the film or array detector with the remaining portion throughout the spectrum allowed to pass to the sample (11).

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