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The stretched quadrupole ion trap: Implications for the Mathieu a u and q u parameters and experimental mapping of the stability diagram
Author(s) -
Johnson Jodie V.,
Peddeer Randall E.,
Yost Richard A.,
March R. E.
Publication year - 1992
Publication title -
rapid communications in mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.528
H-Index - 136
eISSN - 1097-0231
pISSN - 0951-4198
DOI - 10.1002/rcm.1290061210
Subject(s) - mathieu function , chemistry , ion trap , diagram , ion , quadrupole , atomic physics , stability (learning theory) , voltage , quadrupole ion trap , computational physics , physics , quantum mechanics , statistics , mathematics , organic chemistry , machine learning , computer science
The effect of the radial and axial dimensions on the Mathieu stability diagram (in terms of DC and RF voltages) is discussed with relation to the ‘stretched’ geometry employed in the Finningan MAT quardrupole ion‐trap mass spectrometer (ITMS). Equations are presented for the conversion of the Mathieu a u and q u parameters to DC voltages and RF voltages, respectively, and vice versa on the ITMS. A TURBOBASIC program is discussed which will provide data for graphing of a stability diagram in (RF, DC) space. Experimentally determined boundaries of the stability diagram are in good agreement with an approximate model for the stretched trap.