Chromatography Forum

I have changed the source 3 times I just changed the horn everything looks great except the relative abundance of the 219 is less than 35% it used to run around 77% and now I hardly get 25%

This is on autotune mode
standard spectro autotune gets around 44%

any thoughts or ideas im willing to try anything

im using a .15 20m .15 film coulmn and tuning under 50psi head pressure

my foreline runs about 34torr with that setting

Hi!
First, reset your autotune value and make a autotune again.
If not o.k, do a tune evaluation (Msdchemstation, Qualify, Tune evaluation)
What is the reppeler value??How many peak in your tune report?What is your EM voltage??

If reppeler value is 15 to 30 and peak number less than 200, that's o.k.If not, clean your source again.


Do you clean your source part with alumina or with abrasive paper???