EFFECT OF NUMBER OF CHARGES CARRIED BY ARGON ION DARKENING OF ILFORD Q2 EMULSION AS ION DETECTORS IN MASS-SPECTROMETER

The darkening (S) of Illford Q2 photographic plates as ion detectors in mass spectrometer has been investigated. The dependence of the darkening (S) on the ion density (n=ions/mm2) i.e. S=S(n)E for constant energy (E)=z U ranging from 4≦U≦20 Kv of the impinging40A+1-,40A+2- and40A+3-ions when S does not exceed the value 0.15 and the second relation n=n(z U)S for darkening 0.05≦S≦0.15 constructed from the above relation S=S(n)E has been determined. The darkening was found to increase with increasing ion-density which inturn decreases with the ionenergy. For40A+1-,40A+2-, and40A+3-ion of equal energy and ion-density the darkening effect was independent of the number of the charges carried by the argon ion. © 1969 Birkhäuser Verlag.