Mercury fine spectrum

In his recent work on the fine structure of the mercury spectrum, Ruarke has met with only limited success in his attempt to construct a fine structure energy level diagram. The most extensive work on fine structure in mercury has been by Nagaoka, Sugiura and Mishima. Of their results Wood has found the structure assigned to the line 2537 A incorrect and the author has foimd that there appears to be some discrepancies in the structiue reported for the lines 3650 and 2967 A. The full report is being sent the Phil, Mag. for publication. The structures fotmd for these lines are as follows ... 

X-ray absorption spectroscopy is a powerful method to assess the structure of mercury thiolate complexes. X-ray Absorption Near Edge Structure (XANES) spectroscopy can cleanly differentiate Hg(0), Hg(I) and Hg(II) by the energy of the emission edge. Extended X-ray Absorption Fine Structure (EXAFS) spectroscopy provides information regarding the coordination number and Hg-S bond distances. Typically, the EXAFS spectrum can establish the coordination number (/.e., number of sulfur atoms) to within 20%. More important, the bond length precision is 0.01 A. Given that each increase of one... 

FIGURE 3-18. Echelle-prism spectrum of stainless steel with mercury lamp precision wavelength reference. [From G. J. Matz, Recent Advances in Echelle Spectrometer Analysis, American Laboratory, 4 (3), 75. Used by permission of International Scientific Communications, Inc.] Entrance slit, 25 /im wide by 200 /im high. Polaroid type 55 fine-grain film was used. 

Figure 6.3 Mercury Lni-edge spectrum showing pre-edge (below 12 250eV), X-ray absorption near-edge structure (XANES) (12 250-12 350 eV) and extended X-ray absorption fine structure (EXAFS) (12 350-13 000 e regions.

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