Journal
ANALYTICAL CHEMISTRY
Volume 80, Issue 19, Pages 7379-7382Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac801085r
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Funding
- NSF National High Field FT-ICR Facility [DMR-06-54118]
- Florida State University
- National High Magnetic Field Laboratory in Tallahassee, FL
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We describe automation of liquid injection field desorption/ionization (LIFDI) for reproducible sample application, improved spectral quality, and high-throughput analyses. A commercial autosampler provides reproducible and unattended sample application. A custom-built field desorption (FD) controller allows data station or front panel control of source parameters including high-voltage limit/ramp rate, emitter heating current limit/ramp rate, and feedback control of emitter heating current based on ion current measurement. Automated LIFDI facilitates ensemble averaging of hundreds of Fourier transform ion cyclotron resonance mass spectra for increased dynamic range, mass accuracy, and S/N ratio relative to single-application FD experiments, as shown here for a South American crude oil. This configuration can be adapted to any mass spectrometer with an LIFDI probe.
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