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instruments [2012/12/17 18:17]
golack
instruments [2012/12/17 18:23] (current)
golack
Line 12: Line 12:
    Jump position: determine from slow hV scan, pick stable baseline region    Jump position: determine from slow hV scan, pick stable baseline region
    Other signs: ​ drift in d47 vs D47 slopes for heated/​equilibrated gases    Other signs: ​ drift in d47 vs D47 slopes for heated/​equilibrated gases
-''​Causes of baseline shifts''​ + ''​Causes of baseline shifts''​ 
-   ​Secondary electrons. ​ Ion beam can kick off electrons when it hits the cups (or walls, other detector components, etc.)  This shows up as a negative baseline, especially in the very sensitive cups and wider cups.  Scales with main ion beam intensity. +   ​Secondary electrons. ​ Ion beam can kick off electrons when it hits the cups (or walls, other detector components, etc.)  ​ 
-   Peak tailing. ​ The main ion beam does scatter slightly in flight, and some of those ions can be picked up in other cups, giving rise to a positive baseline. Scales with main ion beam intensity. +     This shows up as a negative baseline, especially in the very sensitive cups and wider cups.  ​ 
-   ​+     Scales with main ion beam intensity. 
 +   Peak tailing. ​ The main ion beam does scatter slightly in flight, and some of those ions can be picked up in other cups
 +     This shows up as a positive baseline. ​ 
 +     Scales with main ion beam intensity. 
 +  ''​to be continued''​
  
  
  
instruments.txt · Last modified: 2012/12/17 18:23 by golack