Averaging peak-to-peak voltage detector for absolute mass determination of single particles with quadrupole ion traps
- Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei, Taiwan 106 (China)
A sine wave that controls a quadrupole ion trap is generated from a low voltage source, boosted to high voltage through a transformer. Since not even the best transformers can keep a flat amplitude response with respect to frequency, knowing the accurate peak-to-peak value of the sine wave is paramount when the frequency is varied. We have developed an averaging peak-to-peak voltage detector for such measurements and demonstrated that the device is an essential tool to make possible high-precision mass determination of single charged microparticles with masses greater than 1x10{sup 11} u. Tests of the detector with sine waves from a FLUKE 5720A standard source in the neighborhood of 1400 V{sub pp} and frequencies ranging from 100 to 700 Hz showed a measurement accuracy better than 10 ppm. The detector settled within 5 s after each reset to 5 digits of DVM rock-steady reading, and the calibration against the same source after 3 weeks of continuous use of the circuit produced a mere overall 1 ppm difference.
- OSTI ID:
- 20644078
- Journal Information:
- Review of Scientific Instruments, Vol. 76, Issue 2; Other Information: DOI: 10.1063/1.1841791; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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