I am trying to set up an Elan5000 ICPMS and I have questions about the vacuum system and ion optics.
what are the typical vacuum pressures in the quadrupole chamber, the ion optics chamber and the interface area before and after igniting the plasma?
After ingiting the plasma, the pressures of our ICPMS at these three chambers are 4.85E-3pa, 4.5E-1pa and 2.25E+2pa. I can't get any signals under this condition, so I am wondering if the pressures are too high.
If the pressures are all right, what will be the possible reasons that I can not get signals?
In order to optimize the signal, what are the typical voltages applied on the P lens, entrance and exit lens?
Thank you very much for your help!