Experimental Observation of the Effects of Translational and Rotational Electrode Misalignment on a Planar Linear Ion Trap Mass Spectrometer

Journal Article · Sun Jul 15 04:00:00 EDT 2018 · Journal of the American Society for Mass Spectrometry

DOI:https://doi.org/10.1007/S13361-018-1942-X· OSTI ID:22776892

Tian, Yuan ^[1]; Decker, Trevor K.; McClellan, Joshua S. ^[2]; Wu, Qinghao; Cruz, Abraham De la ^[3]; Hawkins, Aaron R. ^[2]

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1. Zhengzhou University, Department of Chemistry and Molecular Engineering (China)
2. Brigham Young University, Department of Electrical and Computer Engineering (United States)
3. Brigham Young University, Department of Chemistry and Biochemistry (United States)

The performance of miniaturized ion trap mass analyzers is limited, in part, by the accuracy with which electrodes can be fabricated and positioned relative to each other. Alignment of plates in a two-plate planar LIT is ideal to characterize misalignment effects, as it represents the simplest possible case, having only six degrees of freedom (DOF) (three translational and three rotational). High-precision motorized actuators were used to vary the alignment between the two ion trap plates in five DOFs—x, y, z, pitch, and yaw. A comparison between the experiment and previous simulations shows reasonable agreement. Pitch, or the degree to which the plates are parallel along the axial direction, has the largest and sharpest impact to resolving power, with resolving power dropping noticeably with pitch misalignment of a fraction of a degree. Lateral displacement (x) and yaw (rotation of one plate, but plates remain parallel) both have a strong impact on ion ejection efficiency, but little effect on resolving power. The effects of plate spacing (y-displacement) on both resolving power and ion ejection efficiency are attributable to higher-order terms in the trapping field. Varying the DC (axial) trapping potential can elucidate the effects where more misalignments in more than one DOF affect performance. Implications of these results for miniaturized ion traps are discussed. .

• OSTI ID: 22776892
• Journal Information: Journal of the American Society for Mass Spectrometry, Journal Name: Journal of the American Society for Mass Spectrometry Journal Issue: 7 Vol. 29; ISSN 1044-0305; ISSN JAMSEF
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ACCURACY
ACTUATORS
COMPARATIVE EVALUATIONS
DEGREES OF FREEDOM
EFFICIENCY
ELECTRODES
IONS
MASS RESOLUTION
MASS SPECTROMETERS
ROTATION
SIMULATION
TRAPS