Abstract

The ion-optical characteristics of the ultrasensitive mass spectrometer LIDIA designed to search for superheavy elements ( A > 250) with a sensitivity of up to 10 −14 at./at. using a laser plasma ion source and a multistage separation system have been calculated. The main ones (acceptance, momentum dispersion, resolution and line shape) have been measured by means of 249Cf and 226Ra α-particle beams. A good agreement of the obtained results with the calculated ones is shown. The mass spectrometer is made operational with a laser plasma ion source. This will enable one to carry out the mass-spectrometric analyses of natural samples with fairly high utilization of the specimen material (10 −6–10 −3) and wish a resolution sufficient to resolve the mass lines of the superheavy elements searched.

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