instruments
Differences
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instruments [2012/12/17 18:17] golack |
instruments [2012/12/17 18:23] (current) golack |
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| 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
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