Dear fellow listmembers,

We just (re)started our N2 measurements on Europa's Anca TG2.

We're experiencing the following problem:
Right before the actual 28/29/30 peaks, all of the beams experience a
downfall (dropping of the beams). This downfall is worst with beam 3 (m/e
30). Please note that N2 measurements on our Anca-SL module work fine, so
the problem is not within the 20-20 mass spec (both our SL and TG2 module
are connected to the same MS). My guess is that the event file is faulty (or
perhaps the sample loop valve - valve '9'). I would greatly appreciate any
tips on how to solve this problem (event timings would also be very

Thanks a lot!

Best regards,


Peter Vervloedt
Laboratory of Applied Physical Chemistry
Faculty of Agricultural and Applied Biological sciences
Ghent University
Coupure, 653
9000 Gent

tel.: +32 (0)9 264 6048
fax.: +32 (0)9 264 6230

"I have not failed. I've just found 10000 ways that won't work"
- Thomas Alva Edison (1847-1931)