Resonance Ionization Spectroscopy: Counting Noble Gas Atoms
From its beginning, Resonance Ionization Spectroscopy (RIS)  has been recognized as a method for the ionization of matter which is spectroscopically selective and has one-atom sensitivity. Prior to the development of RIS for sensitive analytical purposes, similar laser ionization schemes were proposed  for the separation of isotopes. Two-step selective photoionization of Rb atoms was reported  by AMBARTSUMYAN, KALININ, and LETOKHOV in 1971. For further information on the history of RIS and the use of various laser methods for sensitive detection of atoms, the reader is referred to recent reviews [4–6].
KeywordsProportional Counter Cold Finger Quadrupole Mass Filter Resonance Ionization Spectroscopy Tunable Light
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