A matrix-assisted laser desorption ionization/laser desorption ionization (MALDI/LDI) time-of-flight mass spectrometer (TOF-MS) which includes an ion source employing a ground voltage configuration. The improved MALDI/LDI TOF-MS includes a laser for ablating a sample positioned within a gridless source....http://www.google.com.tw/patents/US5969350?utm_source=gb-gplus-share專利 US5969350 - Maldi/LDI time-of-flight mass spectrometer
