oxygen dc discharge

Hi

I have simulated oxygen dc glow discharge for a month,but not success.

I use the model of positive_column_2d in the model library and change Ar to oxygen.The reactino and date come

from oxygen_gec_icp of the model library.

The error message is always be :repeated error test failures,may have reached a singularity.

I don't konw how to solve this problem.By the way,I used the Cross-Section Data,not the Townsend coefficients and

I think this is not the point.

I hope someone could help me.

thanks.