Table 3
Summary of the measured and inferred reaction rates of atomic and molecular hydrogen with coronene cations in their various hydrogenation states.
| Reaction | k [cm3 s-1] | Ref. | Comments | Evolution with NC |
|
|
||||
 + H |
1.4 × 10-10 | (a) | FA-SIFT | y/x |
 + H |
1.4 × 10-10 | (b, c, d) | extrapolation from  and
 |
y/x |
 +
H |
~5 × 10-11 | (b, c) | extrapolation from  |
constant |
 +
H |
~10-12 | (e) | extrapolation from  ,
 and
 |
constant |
|
|
||||
| +
H2 |
<5 × 10-13 | (a) | FA-SIFT | constant |
| +
H2 |
<5 × 10-13 | (b) | extrapolation from and
|
constant |
| +
H2 |
− | − | − | − |
| +
H2 |
− | − | − | − |
Notes. The type of experimental set-up used to perform the measurements is given in the “Comments” column. When “extrapolation” is mentioned, the rate value was extrapolated from measurements on smaller species. FA-SIFT: flowing afterglow-selected ion flow tube. The last column mentions the kind of variation in the rates with the size of PAHs that we considered in our model. When y/x is mentioned, the rate varies proportionately to the ratio of peripheral (y) to total (x) C-atoms in the species.
Reference. (a) Betts et al. (2006); (b) Le Page et al. (2001); (c) Le Page et al. (1999a); (d) Le Page et al. (1999b); (e) Snow et al. (1998).
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