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plasma module: rate coefficient

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Hi
plasma model DC Discharge have 5 example three of them :1- argon- dbd-1d 2-dpd-flow -control
3-plasma- display- panel

in these example there is a value in Modeling Instructions
(Locate the Kinetics Expressions section. In the kf
edit field, type 3.3734e8 this in Reaction 1 for this formula Ars+Ars=>e+Ar+Ar+ in argon- dbd-1d and in Reaction2 Kinetics Expressions section. In the kf edit field, type 1807 for this formula Ars+Ar=>Ar+Ar
and different this value in others example due to different in kind of reaction and cross section my question
about this value "forward rate constant" and How could get it? from tables or there is program to calculated for each reaction or cross section pleas I need to elucidation that for me so much
thanks

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