Mass Spectrometry Laboratory

School Affiliated departments and LAS

College of Liberal Arts & Sciences

Field Desorption

FD is another technique used for involatile compounds. FD works best for compounds of low polarity, and thus complements FAB. FD uses the same emitter wires used in FI, but the samples are loaded directly on the wire by dipping into a solution of the sample. The sample for FD must be soluble in some solvent (usually 2 mg in 100 microliter).

Low resolution FD Instrument: 70-VSE Sample size: 1-2 mg

Spectra are obtained at increasing emitter heating current and is reported in milliamps on each spectrum. You must indicate a solvent on your sample submission form, since a solution of your compound is deposited on the emitter wire in FD.

University of Illinois at Urbana-Champaign
Mass Spectrometry Laboratory
35 Noyes Laboratory
MC-712 Box 51-1
505 South Mathews Ave.
Urbana, IL 61801
Furong Sun

tel: 217/333-2545
frs [at] illinois [dot] edu
Lab Hours: 24/7 access by key
Staff Available 8 am to 4:45 pm
Monday through Friday

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