Ultrahigh vacuum surface analysis apparatus

UHV surface analysis, apparatus designs, 36 4-14 see also Ultrahigh vacuum surface analysis mechanisms, 32 313, 319-320 Modified Raney nickel catalyst defined, 32 215-217 hydrogenation, 32 224-229 Modifying technique of catalysts, 32 262-264 Modulated-beam mass spectrometry, in detection of surface-generated gas-phase radicals, 35 148-149 MojFe S CpjfCOlj, 38 352 Molar integral entropy of adsorption, 38 158, 160-161... 

Fig. 3. Ultrahigh vacuum apparatus for studying single-crystal catalysts before and after operation at high pressure in catalytic reactor. Position 1 crystal is in position for Auger electron spectroscopy study of surface composition or of ultraviolet photoemission spectrum of surface species. Position 2 crystal is in position for deposition of a known coverage of poisons or promoters for a study of their influence on the rate of a catalytic reaction. Position 3 crystal is in position for a study of catalytic reaction rate at elevated pressures (s2 atm). Gas at high pressure may be circulated by using a pump mass spectrometric-gas chromatographic analysis of the reactants and products is carried out by sampling the catalytic chamber. From Ref. 5.

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