Dear Juan,


I can't help you with a reference but I can tell you that more than just NO 
is formed when N2 and O2 enter the ion source simultaneously; N2O and NO2 
are formed as well.

You can verify this quite easily by injecting an N2/O2 mix in air 
proportion(8:2) into a system and monitoring masses 44, 45, 46. You will 
see the beams for all three masses increase but because of the staggered 
resistor setting, masses 45 and 46 will dominate leading to interesting 2/1 
and 3/1 ratio traces.

One other source of NO is combustion of N-containing compounds and 
non-quantitative reduction of the resulting NOx mix.


Regards,

Wolfram




On Jun 28 2006, Juan Marini wrote:

> Dear all,
> 
> Could anyone provide a reference (or two) on the formation 
> of NO when N2 and oxygen enter the source? 
> 
> Thanks
> 
> Juan
>