Nitrogen molecule bond energy

In formulating a set of bond-energy values we first calculated the energies of formation of molecules from experimental values of the heats of combustion of the compounds6 and thermochemical data pertaining to the products of combustion—carbon dioxide, water, nitrogen, etc. The same values for the latter quantities were used as previously.4... 

However, the nitrogen molecule has afar greater bonding energy than ammonia and is more difficult to dissociate into free atomic nitrogen active species. Consequently, the deposition rate is extremely slow. This can be offset by plasma activation with high frequency (13.56 MHz) or electron cyclotron resonance (ECR) plasmasP Ef l and with micro-wave activation. 

Ground-State Energy of the Nitrogen Molecule as a Function of Bond Length Examined with 2-RDM... 

Calculation of Reference Bond Energies [Eq. (10.39)]. The parameters indicated in Table 10.4 are ready for use in the bond energy formula, Eq. (10.39). The following examples, in part based on detailed results given in Chapters 15 and 16 for nitrogen- and oxygen-containing molecules, illustrate the procedure and report the input data. 

We conclude that there is an abnormality in the structure of the nitrogen molecule such as to increase the NsN bond energy from 147 to 226 kcal/mole. This abnormality is not shown by the N=N and N—N bonds. Its nature is not known. It is responsible for the great stability of the nitrogen molecule that causes many nitrogen compounds to be explosive and causes elementary nitrogen to be a major constituent of the atmosphere. 

---