@article {366,
title = {Influence of the 6th and 10th spatial harmonics on the peak shape of a quadrupole mass filter with round rods},
journal = {Rapid Communications in Mass Spectrometry},
volume = {16},
number = {15},
year = {2002},
note = {ISI Document Delivery No.: 578QXTimes Cited: 32Cited Reference Count: 32},
pages = {1425-1431},
type = {Article},
abstract = {The influence of the ratio of the rod radius, r, to field radius, r(0), on the peak shape for a linear quadrupole mass filter constructed with round rods has been investigated. The expansion of the potential in multipoles, phi(N),Phi(x,y)= Sigma(N=0)(infinity)A(N)phi(N)/r(0)(N), has been considered, and the peak shape and resolution have been determined by numerical calculation of ion trajectories in quadrupoles with different ratios, r/r(0). Geometries that make the dodecapole term (A(6)) zero (r/(0) = 1.14511) do not give the best performance because the contribution of the 20-pole term, A(10), must be considered. The optimum ratio is r/r(0) approximate to 1.13. With this ratio the dodecapole term (A(6)) is ca. 1 x 10(-3), but its effects are partially compensated by the A(10) term which has similar magnitude, but opposite sign. Copyright (C) 2002 John Wiley Sons, Ltd.},
keywords = {2ND, ION-TRAP, REGION, SIMULATION},
isbn = {0951-4198},
url = {://000177131400003},
author = {Douglas, D. J. and Konenkov, N. V.}
}