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- Posts: 12
- Joined: Fri Oct 21, 2016 2:01 pm
On an Agilent GCMS system (7890A/5975C) we weekly check if the recommended PFTBA- fragmentation conditions (69mz: 100%, 219mz:~50%, 502:~1%) are met, which was the case for months.
After cleaning the ion source and a following tuning procedure however, the PFTBA fragmentation pattern changed and now turns out to be: 69mz:100%, 219:~90%, 502:~10%.
Has anyone experienced this phenomenon before?