Proton affinity
my home upper InterStellar Chem grain density Abundance Table Dissociate energy Polarizability Proton affinity Charge trans rate Ionize potential rate coeff

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Proton affinities of some atoms and molecules (from Tab. 3.2 of Duley & Williams, 1984inch.book.....D)

The proton affinity of a species A is defined as the released energy dE when A captures a proton (H+) to form hydrid ion: A + H+ -> AH+ + dE. The unit of dE is eV.

Atoms Diatomic molecules Triatomic molecules Multiatomic molecules  
H    2.69   H2    4.34   O2    4.34   H2O    7.16   CH3    5.55   
He    1.82    OH    6.25    CO    6.20   CH2    8.68   NH3    8.98   
O    5.03    CH    7.59    NO    4.99   NH2    7.98   CH4    5.68   
C    6.46    NH    6.12    C2    7.20   H2S    7.37   H2CO    7.24   
N    4.21    SH    7.16    CN    4.99    HCO    6.72   C2H2    6.59   
Si    8.68    SiH    >10.15   N2    5.03    HCN    7.37   C2H4    6.94   
Mg    8.03        CS    7.57   C2H    6.98   C2H6    6.25   
S    6.81                 
 

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