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  • P-ISSN 2233-4203
  • E-ISSN 2093-8950

Studies of the Organic Molecules Dissociative Surface Ionization in the Mass-Spectrometric Surface Ionization Method

Mass Spectrometry Letters / Mass Spectrometry Letters, (P)2233-4203; (E)2093-8950
2024, v.15 no.1, pp.54-61
Saydumarov Ilkhomjan (Tashkent State Transport University)
Usmanov Dilshadbek (Uzbekistan Academy of Sciences)
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An improved voltage modulation method (VMM) was used to control the heat release and adsorption properties of the adsorbent. In this work, the voltage and flux modulation methods were considered under unified experimental conditions of dissociative surface ionization (SI) of polyatomic organic molecules, the criteria were found when under VMM conditions the current relaxation of SI carries information about the kinetic properties of thermal desorption of ionizable dissociation particles arriving on the surface of polyatomic molecules. Conditions were found under which the relaxation of the ionic current in the flux modulation method is determined by the kinetics of the heterogeneous dissociation reaction of the original polyatomic mol-ecules. The values of the thermal desorption rate constant K + and the activation energy E + obtained with VMM for desorption of (CH 3 ) 2 NCH + 2 ions with m/z 58 by adsorption of imipramine and amitriptyline molecules agree well with each other and with the results for the desorption of the same ions by adsorption of other molecules. This confirms one of the basic conditions for the equilibrium process SI – the a degree (β coefficient) of the same particles SI on the same emitter surface is the same and does not depend on the way these particles are formed on the emitter surface.

multi-atomic molecule, ionization, process, modulation, voltage, lifetime

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Mass Spectrometry Letters