M.V. Dubkov – Ph.D.(Eng.), Associate Professor, Head of Department «General and Experimental Physics»,  Ryazan State Radio Engineering University

E-mail: dubkov.m.v@rsreu.ru

M.A. Burobin – Ph.D.(Eng.), Associate Professor, Deputy Head of Department «General and Experimental Physics»,  Ryazan State Radio Engineering University

E-mail: burobin.mikhail@yandex.ru

A.E. Malyutin – Ph.D.(Phys.-Math.), Associate Professor, Department «General and Experimental Physics»,  Ryazan State Radio Engineering University

E-mail: aemalutin@mail.ru

I.A. Kharlanov – Ph.D.(Eng.), Associate Professor, Department «General and Experimental Physics»,  Ryazan State Radio Engineering University

E-mail: markigschlachter@yandex.ru

The modes of operation of quadrupole mass spectrometers are considered. The prospects of using the «boundary compression» mode for improving the analytical characteristics of quadrupole transit-type mass analyzers are shown. By means of numerical simulation, the principal possibility of using the «boundary compression» mode to improve the analytical characteristics of a monopolar mass analyzer has been proved.

This paper is devoted to the study of the possibility of improving the analytical parameters - the resolution and sensitivity of the monopolar mass analyzer by implementing the «boundary compression» (SG) mode. In this mode, the working line crosses the stability zone far from the top, and during the separation of the selected ion, its working point is transferred at least once from one boundary of the stability zone to another. The transfer of the working point performs by changing the amplitude of the supply voltage. As a result, a kind of «compression of the boundaries» of the stability zone along one of the coordinates occurs.

The previously proposed sectional principle of constructing electrode systems makes it easy to implement the SG mode in a monopolar mass analyzer consisting of two identical sections of electrodes to which an alternating pulsed RF voltage is applied. The amplitudes of the voltages applied to the individual sections of the electrodes must differ by α times, where α is the so-called operating point transfer factor. A numerical simulation of the monopolar mass analyzer was performed. The numerical model is based on solving the equations of motion of charged particles with subsequent trajectory analysis and calculating the shape of the mass peak.

Calculations showed that the shape of the mass peak practically does not depend on the coefficient α. But the dependences of the mass peak intensity and resolution on the transfer factor have a maximum, the magnitude and position of which depends on the number of sorting periods. In the course of research, it was possible to obtain the maximum increase in resolution by 11% and the intensity of the mass peak - by 6%.

It is worth noting that the improvement of the analytical characteristics does not require significant structural changes in the monopolar mass analyzer. As a further development, it is proposed to implement the «boundary compression» mode by changing the characteristic size of the electrode system in a two-section monopolar mass analyzer.

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