Filtered noise field signals for mass-selective accumulation of externally formed ions in a quadrupole ion trap
作者： Douglas E. Goeringer , Keiji G. Asano , Scott A. McLuckey , Don. Hoekman , Steven W. Stiller
DOI: 10.1021/AC00075A001
关键词:
摘要: A new wideband resonance excitation technique, termed a filtered noise field (FNF), is demonstrated for selective accumulation of externally formed ions in the rf quadrupole ion trap. Data obtained detection trinitrotoluene (TNT) and black powder vapors ambient air, via atmospheric sampling glow discharge ionization (ASGDI), indicate that notch-filtered FNF signal applied to endcap electrodes can prevent matrix without adversely affecting injection efficiency analyte species. Consequently, enhancement be realized extended times even though unwanted are present overwhelming abundance. The TNT molecular anion following 1-s period factor approximately 8 greater than seen FNF; S[sub 2][sup [minus]] 3][sup cluster signals, obscured due matrix-ion-induced space charge effects, also isolated completely FNF. subsequent use concatenated waveforms enhance specificity MS/MS illustrated. FNF-ion trap techniques described here should generally applicable many other sources, whether internal or external configuration. 37 refs., 6 figs., 1 tab.
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