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Table 4:

Comparison with UMIST and Ohio State Chemical Network rate constants and their implied branching fractionsa.
Reaction products $\alpha$ $\beta$ Branch. Fract.
  $\times$10-7   (%)
OSU      
CH3OCH4+ + e- $\rightarrow$      
      CH3OCH3+H 1.50 -0.50 33.3
CH3OH+CH3 1.50 -0.50 33.3
CH3+ CH4+O 1.50 -0.50 33.3
Total 4.50 -0.50 100
UMIST      
CH3OCH4++e- $\rightarrow$      
      CH3OCH3+H 1.50 -0.50 50
CH3OH+CH3 1.50 -0.50 50
Total 3.00 -0.50 100
Current data      
\ensuremath{{\rm (CD_3)_2OD^+~+~e^- \rightarrow}}      
      CH3OCH3+H 0.85 -0.70 7
CH3OH+CH3 $\leq$9.18 -0.70 $\leq$49
CH3+ CH4+O $\leq$6.97 -0.70 $\leq$44
Total 17 -0.70 100
OSU      
H5C2O+ + e- $\rightarrow$      
      CO+CH4+H 3.00 -0.50 40
H2CO+CH3 1.50 -0.50 20
CH3CHO+H 1.50 -0.50 20
H2CCO+H2+H 1.50 -0.50 20
Total 7.50 -0.50 100
UMIST      
\ensuremath{{\rm CH_3CHOH^+~+~e^-\rightarrow}}      
      CO+CH4+H 3.00 -0.50 50
H2CO+CH3 1.50 -0.50 25
CH3CHO+H 1.50 -0.50 25
Total 6.00 -0.50 100
Current data      
\ensuremath{{\rm CD_3OCD_2^+ + e^- \rightarrow}}      
      CO+CH4+H $\leq$17 -0.77 $\leq$100
H2CO+CH3 $\leq$17 -0.77 $\leq$100
CH3CHO+H 0 -0.77 0
H2CCO+H2+H 0 -0.77 0
Total 17 -0.77 100

Notes. (a) Rate constants are $k(T) = \alpha$*(T/300)$^\beta$ cm3 s-1 and are compared to the product channel upper limits of the current data. Note that the exact isomers for \ensuremath{{\rm CH_3OCH_2^+}} were not found in the model databases.


Source LaTeX | All tables | In the text

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