Application of surface ionization to determine rate constant and activation energy of dissociation reactions of nitrogen base polyatomic molecules on W oxides
G. T. RakhmanovArifov Institute of Electronics, Uzbek Academy of Sciences, Akademgorodok, 700125 Tashkent, UzbekistanУ. Х. РасулевArifov Institute of Electronics, Uzbek Academy of Sciences, Akademgorodok, 700125 Tashkent, UzbekistanI. SaidumarovArifov Institute of Electronics, Uzbek Academy of Sciences, Akademgorodok, 700125 Tashkent, Uzbekistan
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Abstract Adsorption and surface ionization of procaine, imipramine, amitriptyline and tetraethylammonium chloride on oxidized tungsten surface have been studied by the methods of voltage modulation and flux modulation under identical experimental conditions with the high‐vacuum mass‐spectrometric set up having a ‘black’ chamber with the walls cooled with liquid nitrogen. Rate constants and activation energies of dissociation reaction of initially adsorbed molecules by (C–C) β bonds with formation of radicals to be ionized have been defined. Also, rate constants and activation energy of desorption of these radicals as ions (CH 3 ) 2 N + CH 2 and (C 2 H 5 ) 2 N + CH 2 have been determined. Copyright © 2006 John Wiley & Sons, Ltd.
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