Revised Manuscript-ac-2020-00588t.pdf (1.11 MB)
Larmor precession: observation and utilization for boosting the signal intensity of radio frequency glow discharge mass spectrometry
journal contribution
posted on 2023-06-07, 07:00 authored by Mengli Wang, Rong Qian, Shangjun Zhou, Qiao ChenQiao Chen, Zhongquan Li, Bin ZhaoA novel magnet array system was constructed to use Larmor precession for boosting the signal intensity of rf-GD-MS. The enhancement mechanism with four magnet array devices of single block magnet and 2×2, 3×2, and 3×4 magnet arrays was simulated and studied by COMSOL Multiphysics Software 5.4.0 (COMSOL) to determine if the electrons in the discharge plasma could perform Larmor precession along the direction perpendicular to the magnetic field. Induced by Larmor precession, inelastic collisions between the primary electrons and sample produced numerous secondary electrons and further improved the ionization efficiency. Moreover, the fuzzy synthetic evaluation result predicted that the device with 3×2 magnet array would display the greatest enhancement effect among the four devices. Based on these theoretical studies, a magnet array system with four magnet array devices was fabricated and utilized for studies of two scintillation crystals BGO and PWO. The observations indicated that the signal intensities obtained for 209Bi and 208Pb with the magnet array system were 630-3600 times of that obtained without magnet, and were enhanced by a factor of 1.5-2.8 compared with a previously reported stacked magnetic device. Two NIST samples were used to validate the method, and the results suggested that relative errors were less than 10% and the lowest detection limit for the 3×2 magnet array could reach 0.0032µg•g-1. Furthermore, the magnet array enhancement system with Larmor precession offers an efficient and sensitive approach for the direct analysis of non-conducting materials.
History
Publication status
- Published
File Version
- Accepted version
Journal
Analytical ChemistryISSN
0003-2700Publisher
American Chemical SocietyExternal DOI
Issue
14Volume
92Page range
9528-9535Department affiliated with
- Chemistry Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2020-07-22First Open Access (FOA) Date
2021-06-30First Compliant Deposit (FCD) Date
2020-07-21Usage metrics
Categories
No categories selectedLicence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC