Electron affinity azide radical

The azide radical is linear, as is its anion. Ozone, sulfur dioxide, and N02 are bent in the neutral form and in the anion. The neutrals of C02, CS2, COS, and N20 are linear and the anions bent, as predicted by simple molecular orbital theory. The electron affinities of these species are uncertain [90-102], In Figure 9.17 the ECD data for these compounds are shown. The diversity in the temperature dependence of the isoelectronic molecules is remarkable. The ECD response of C02 is unexplained. The temperature dependence for CS2 is typical of nondissociative electron attachment to two states. The low-temperature dependence of COS is unusual, but can be attributed to attachment to two states with a low A. Dissociative electron attachment and molecular ion formation are observed in the ECD data for N20. Consequently, only an upper limit to the electron affinity may be obtained [90-93],... 

The electron affinities of several triatomic molecules and the azide radical have been evaluated and are supported by the CURES-EC method. The molecules that are linear in the neutral and bent in the anion have been emphasized. The ECD data support two negative-ion states. Morse potential energy curves for N20 and CS2 have been constmcted for the linear and bent ions. The relative energies of the anion and neutrals for C02, COS, CS2, and N20 were presented to explain the electron attachment data. The electron affinities of the SF molecules n = 1 to 6 were evaluated and the largest values assigned to the ground state. 

The thermochemistry of the azide radical (N3) is treated in Yoffe s review article [1]. The most important quantity for the purposes of this chapter is the electron affinity A of N3. The term electron affinity will be used rather loosely to mean the minimum energy required to remove an electron from an azide ion in free space (the subscript g denotes the gaseous phase)... 

---