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Averaging peak-to-peak voltage detector for absolute mass determination of single particles with quadrupole ion traps.
- Source :
-
Review of Scientific Instruments . Feb2005, Vol. 76 Issue 2, p023108. 5p. - Publication Year :
- 2005
-
Abstract
- 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 1×1011 u. Tests of the detector with sine waves from a FLUKE 5720A standard source in the neighborhood of 1400 Vpp 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. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00346748
- Volume :
- 76
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Review of Scientific Instruments
- Publication Type :
- Academic Journal
- Accession number :
- 15877926
- Full Text :
- https://doi.org/10.1063/1.1841791