Aspects of FT-ICR software—I: An efficient adaptive matched filter for fast transient signals

Abstract An adaptive matched filter is described that extracts from a noisy transient signal a single narrow-band component of which the frequency is known only approximately. A computational scheme is given that requires only one addition per data point. The filter is applied in FT-ICR to the tuning up of the instrument, to double-resonance and to single-ion-monitoring.