An investigation of the ESD O / O + ratio from V205 and oxidized V
نویسنده
چکیده
The ratio of oxygen atoms to ions (O /O +) generated during electron stimulated desorption (ESD) from V20 s and oxidized V foil has been investigated. Desorbates were probed directly with high resolution quadrupole mass spectrometry. X-ray photoelectron spectroscopy was used as an indirect probe to measure the ESD induced surface oxygen loss. Despite the number of ESD target preparation methods and experimental variations used, ESD O atoms were never detected. Accordingly, the results are presented as an upper limit to the ESD O / O + ratio, as determined by the neutral detection limit of the given instrumental method. The results of the mass spectral probe were an O / O + ratio of = 54 (oxidized V foil), 58 (1802/V205) and 160 (V205). From the XPS results (oxidized V foil) the ratio was determined to be = 4.
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