UDC 621.384.8:543.51
ANALYTICAL REPRESENTATION OF ION CAPTURE COEFFICIENT IN QUADRUPOLE ION TRAP
A. E. Malyutin, Ph.D. (Phys. and Math.), associate professor, Department of general and experimental physics, RSREU, Ryazan, Russia; orcid.org/0000-0002-1704-0792, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
V. V. Ivanov, Ph.D. (Tech.), associate professor, Department of general and experimental physics, RSREU, Ryazan, Russia;
orcid.org/0000-0002-5655-0111, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
Yu. V. Cherkasova, Ph.D. (Tech.), associate professor, Department of general and experimental physics, RSREU, Ryazan, Russia; orcid.org/0000-0003-2474-3629, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
The aim of the work is to research the possibility of applying an analytical approach to solve the problem of the effectiveness of quadrupole mass spectrometers. The theoretical derivation of expressions describing ion capture coefficient in a quadrupole ion trap, taking into account the distribution of their initial parameters in phase space, is made. Several possible distributions of initial parameters are considered: point ionization region, axial ionization, ionization by a ribbon beam and the input of ions from the outside. It is shown that in all cases it is possible to obtain analytical expressions for ion capture coefficient or sufficiently accurate analytical approximations.
Key words: mass spectrometry, quadrupole ion trap, ion capture coefficient, phase space, capture ellipses.