Why my no gas mode has no counts on ICPMS 7900?

Are you using multitune in your batch and if so, is the no gas tune the first tune used?  If so, perhaps the sample isn't reaching the nebulizer in time for the analysis.  I would check your sample uptake settings and your peri-pump tension if applicable.

Are you using multitune in your batch and if so, is the no gas tune the first tune used?  If so, perhaps the sample isn't reaching the nebulizer in time for the analysis.  I would check your sample uptake settings and your peri-pump tension if applicable.

Thanks a lot, yes the problem was peri pump setting. Now all is good.