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éB±êðWõ~[úËõ Sept. 2012 Vol.25 No.5  269(C) 2012 The Japanese Society for Synchrotron Radiation ResearchFig. 1(Color online) Schematic concept of wavelength­dispersiveXAFS.

Fig. 2 (Color online) Schematic layout of wavelength­dispersive
XAFS measurement with an electron energy analyzer.

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Fig. 3(Color online) Electron intensity image on the two­dimen­
sional detector (bottom) and its integral along the electronkinetic energy (top) taken from clean (a) and CO­adsorbed(b) Pt(111) single crystal surface.

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½è30 s ÆCÊíÌ10{öxÌ¬xÅªèªs¦Ä¢éB30 s/spectrum Æ¢¤ÌÍÜè¬¢ÆÍ¾¦È¢©àµêÈ¢ªCãqÌæ¤É·×ÄÌf[^_ª¯¶Éªè³êÄ¢é±ÆÉå«ÈÓ¡ªFig. 4(Color online) O K­edge X­ray absorption spectra for ad­
sorbed CO taken by the conventional mode with amonochromator scan (a) and the dispersive mode at a ben­ding­magnet (BM) (b), and an insertion­device (ID) (c)beamlines.

Fig. 5(Color online) Three­dimensional plot of O K­edge XAFS
spectra taken at every 33 ms during the exposure of the O/Ir(111) surface to 4~10|7 Torr CO at 400 K (a) and time
evolution of O and CO coverages at 400 (b) and 550 K (c)obtained by tting each XAFS spectrum.

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Fig. 7(Color online) Time evolution of normalized peak intensity
for vertical and horizontal polarizations simultaneously
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11)

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Recent developments of thewavelength­dispersive XAFS techniquein the soft X­ray region
Kenta AMEMIYAAbstract

Institute of Materials Structure Science, High Energy Accelerator ResearchOrganization, 1_1 Oho, Tsukuba, Ibaraki 305_0801, JapanThe wavelength­dispersive XAFS (X­ray absorption ne structure) technique, by which a XAFS
spectrum is recorded at once without monochromator scan, is suitable for tracing high­speed
phenomena such as surface chemical reactions, in which a frequent repetition is hardly expected.
Although only about ten years have been past from the development of the technique, the time
resolution has been greatly improved, and a continuous measurement with a 33 ms time resolu­
tion is achieved at present. Moreover, it has very recently been demonstrated that the orientationof adsorbate, as well as the amount of each chemical species, is traced within one chemical reac­tion, by combining the wavelength­dispersive XAFS with switching between the vertical andhorizontal linear polarizations.

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