To provide an ion source which efficiently ionizes a sample gas with a laser light source that emits low-pulse laser light, and to provide a concentration apparatus using the ion source.
The ion source 3A comprises a sample cell S formed of an electrode 11A, an ion extracting electrode 21A, etc., an electrostatic lens 22A, and a laser emitting means including laser light sources 23A and 23B, a mirror 25A, and a lens 27A. The electrode 11A is cooled by a cooling medium, and has a sample gas passage 15 formed to provide a communicating passage leading to a nozzle 15a towards an inner peripheral surface 11b. The lens 27A is composed of a pair of cylindrical lenses arranged with a given gap. The lens 27A works as a convex lens to condense parallel beams of detaching laser light RA and ionizing laser light RB to cause the beams to pass through openings 21a and 22a, so that the beams passing through openings 21a and 22a widen to irradiate a wide area of the inner peripheral surface 11b.
IZUMIDA TATSUO
SUZUKI KAZUTOSHI
WAKAI ATSUSHI
NATL INST RADIOLOGICAL SCIENCE
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Etsuo Tada
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