A mass spectrometer is disclosed comprising a separation device arranged and adapted to emit an eluent over a period of time. The separation device preferably comprises a Capillary Electrophoresis (“CE”) separation device. The mass spectrometer further comprises a nebuliser and a target. Eluent emitted by the separation device is nebulised, in use, by the nebuliser wherein a stream of analyte droplets are directed to impact upon the target so as to ionise the analyte to form a plurality of analyte ions.