SEARCH Articles Figures Tables Detectors helium ionization Detectors pulse discharge helium ionization Helium atom first ionization energy Helium atom ionization potential Helium discharge ionization detector Helium discharge ionization detector HDID) Helium ionization electron emission Helium ionization energy Helium ionization yield Helium, field ionization Helium, ionization potential Ionization detector pulsed helium Ionization potential of helium Pulse discharge helium ionization detector PDHID) The Helium Ionization Detector (HID)