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An air ioniser (or negative ion generator or Chizhevsky's chandelier) is a device that uses high voltage to ionise (electrically charge) air molecules.Negative ions, or anions, are particles with one or more extra electrons, conferring a net negative charge to the particle.ost commercial air purifiers are designed to generate negative ions. Another type of air ioniser is the ESD ioniser (balanced ion generator) used to neutralise static charge. In 2002, Cecil Alfred 'Coppy' Laws was credited with being the inventor of the domestic air ioniser in an obituary in The Independent newspaper.
Terrorist chemical attacks; How Does an FID Work? FIDs, like PIDs, are ionization detectors. The difference between them is the way ions are produced. In our introduction to PIDs section you learned that PIDs use high energy Ultra Violet light to ionize molecules. FIDs do not use ultra violet light, instead the compounds in the sample stream are burned in a hydrogen fueled-flame. The hydrogen flame can ionize any organic material with an ionization potential (IP) of 15.4 or less. Like the PID, ions formed in the sample stream are driven in one direction by a bias electrode and accumulated at a collecting electrode.