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Table 2

UDFA and Ohio State Chemical Network rate constantsa.

Reaction products α β Branch. Fract.
 × 10-7 (%)

OSU
CH3CH2O+ + e −  → 
CH3 + HCO + H 1.35 –0.50 45
CH2 + H2CO + H 1.35 –0.50 45
CH3 + H2CO 0.150 –0.50 5
CH3CHO + H 0.150 –0.50 5
Total 3.00 –0.50 100
UDFA
CH3CHOH+ + e −  → 
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
CD3CDOD+ + e −  → 
CD3 + DCO + D  ≤ 8.47 –0.74  ≤ 77
CD2 + D2CO + D  ≤ 8.47 –0.74  ≤ 77
CO + CD4 + D  ≤ 8.47 –0.74  ≤ 77
D2CO + CD3  ≤ 8.47 –0.74  ≤ 77
CD3CDO + D  ≤ 3.00 –0.74  ≤ 23
Total 11 –0.74 100
OSU
 → 
CH3 + CH2 + OH + H 6.75 –0.50 74.4
CH3 + CH2 + H2O 0.675 –0.50 7.4
C2H5 + OH + H 0.675 –0.50 7.4
C2H4 + H2O + H 0.675 –0.50 7.4
C2H5 + H2O 0.150 –0.50 1.7
C2H5OH + H 0.150 –0.50 1.7
Total 9.075 –0.50 100
UDFA
 → 
C2H4 + H2O + H 1.50 –0.50 50
C2H5OH + H 1.50 –0.50 50
Total 3.00 –0.50 100
Current data
 → 
CH3 + CH2 + OH + H 0 –0.73 0
CH3 + CH2 + H2O 0 –0.73 0
C2H5 + OH + H  ≤ 17.7 –0.73  ≤ 93
C2H5 + H2O  ≤ 17.7 –0.73  ≤ 93
C2H4 + H2O + H  ≤ 17.7 –0.73  ≤ 93
C2H5OH + H  ≤ 1.3 –0.73  ≤ 7
Total 19 –0.73 100

Notes. (a) Where k(T) = α*(T/300)β cm3 s-1 and their implied branching fractions. These are compared to the product channel upper limits of the current data.

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