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    STUDIA PHYSICA - Ediţia nr.SPECIAL ISSUE din 2001  
         
  Articol:   EXTENDING THE APPLICATION AREA OF A TIME-OF-FLIGHT MASS SPECTROMETER TO DETECT FRAGMENTS RESULTING FROM MULTIPLY CHARGED ION COLLISIONS.

Autori:  DANA DUMITRIU, D. IOANOVICIU, CONSTANTIN CIORTEA, N. GLIGAN, GH. BACIU. 		 
       
         
  Rezumat:  The detection of the fragments resulted from collisions of high energy multiply charged ions is connected with the extraction of the analysed charged particles from an increased volume. This implies some specific conditions concerning the time-focusing conditions. Therefore some modifications can be included in the design of the time-of-flight mass spectrometer constructed for fullerene ion detection. The ion source (Fig. 1) was adapted to accomodate the high energy ion beam. The structure of the ion extracting electrode system was redesigned with this purpose. Appropriate diameter opennings were provided to obtain the desired reacting gas throughput. The eflectron was adapted to the deeper analysed ion forming region. With this purpose the system was recalculated for second order focusing conditions. A solution was found accounting for the insertion of an additional grid in the former reflectron design.  
         
     
         
         
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