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The Effect of Surface Oxide on the Changes in the FeLII/LIII Ratio with Accelerating Voltage

  • J. E. Holliday (a1)

Abstract

Measurements have been made on the FeLII/LIII intensity ratio on oxide free iron surface produced by evaporating a 50 Å Ti film on iron. These results show that the reported increase in the FeLII/LIII ratio with decreasing accelerating voltages is due largely to surface oxide and not self absorption. Also, for the vacuum presently used by soft x-ray spectroscopists the oxide surface on metals contribute strongly to the soft x-ray spectra of the bulk material for accelerating voltages below 4 kV.

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1. Holliday, J. E., “The Use of Soft X- ray Fine Structure in Bonding Determination and Light Element Analysis”, Norelco Reporter 14, 84 (1967).
2. Fischer, D. W., “Changes in the Soft X- ray L Emission Spectra with Oxidation of the First Series Transition Metals”, J. Appl. Phys. 36, 2048 (1965).
3. Fischer, D. W. and Baun, W. L., “Band Structure and the Titanium LII,III X- ray Emission and Absorption Spectra From Pure Metal Oxides, Nitride, Carbide and Boride”, 39, 4757, (1968).
4. Hoillday, J. E., “Soft X- ray Valance State Effects in Conductors” in the Advances in X- ray Analysis. Vol. 13, Henke, B. L., Mallett, G. R. and Newkirk, J. B., eds., Plenum Publishing Co., 1970, pp. 136-57.
5. Skinner, H. W. B., Bollen, T. and Johnston, J. E., “Notes on Soft X- ray Spectra Particularly of the Fe Group Elements”, Phil. Mag. 45, 1070 (1954).

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