Ion remeasurement in the radio frequency quadrupole ion trap
- Oak Ridge National Lab., TN (United States)
Multiple remeasurement of the same population of stored ions in a radio frequency (rf) quadrupole ion trap is demonstrated. As the secular frequency of stored ions is swept across a fixed-frequency resonance excitation signal via amplitude modulation of the confining rf voltage, the image current generated by the resulting coherent ion motion is measured simultaneously with tuned-circuit, phase-sensitive detection. Judicious selection of the resonance excitation frequency and rf voltage ramp limits enables the excitation-detection process to be performed over a range of mass-to-charge values. Furthermore, the inherent focusing of the quadrupole field and use of helium buffer gas (nearly 10{sup -4} Torr) enable repeated scans to be made with negligible ion loss. For a collection of C{sub 3}F{sub 5}{sup +} ions (m/z 131) produced via a single electron ionization event, the remeasurement efficiency during 24 scans, as judged by the scan-to-scan loss in signal, was > 99%. 33 refs., 3 figs.
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 159683
- Journal Information:
- Analytical Chemistry (Washington), Vol. 67, Issue 22; Other Information: PBD: 15 Nov 1995
- Country of Publication:
- United States
- Language:
- English
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