A time-of-flight mass spectrometer includes a gridless dual-stage ion reflector (10) having a high-field first stage (18) and a low-field second stage (19). The ratio of the electric field strength in the low-field second stage (19) to the electric field strength in the high-field first stage (18) is...http://www.google.fr/patents/US6384410?utm_source=gb-gplus-shareBrevet US6384410 - Time-of-flight mass spectrometer
