The multichannel reaction NH2 + NH2 at ambient temperature and low pressures

Combustion Chemistry of Nitrogen

“…The input parameters are listed in Table 2.9 and the results are compared to the reported rate coefficients in Figure 2.30. The barrier for channel 17b was adjusted to 238 kJ/mol so as to agree with the low-temperature, low-pressure data of Stothard et al (1995), which is consistent with the reverse reaction, a singlet radical inserting into H2, having a low barrier. The calculations indicate that the dominant product channel for the conditions of the Stothard et al experiments is indeed 17b, for about 80% of the total rate, consistent with their finding that H2 is the major product.…”

“…Low-temperature measurements by Stothard et al (1995) indicate that H2 production dominates. Because there must be a low energy barrier for this channel, formation of H2 and singlet H2NN are indicated; formation of H2 and N2H2 would be expected to have a much higher barrier, as shown in Figure Possible product channels include…”

“…These results are summarized in Figure 2.30. With the notable exception of Stothard et al (1995), most of the lower temperature studies report that the product is N2H4. However, the reported rate coefficients vary widely (Mallard et al 1993).…”

“…The pressure of the experiments (about 1 mbar) was too low for N2H4 stabilization to be important. Rate coefficients: kl Back and Yokada (1973) and Sarkisov et al (1984); L I microscopic reversibility (MR); k2 via L2 and MR with k-2 = l.Ox 10 14 from H + C2H3 of Duran et al (1988); k3 estimated using Ea = flrlf' + 300 kJ/mol, based upon C2H4 ~ C2H2 + H2 1,2 elimination, A-factor from TST, loss of I rotor, degeneracy = 4; k4 A-factor from Laufer et al (1983) for H2C2 + H2, Ea adjusted to fit data of Stothard et al (1995). Several conclusions emerge from these comparisons.…”

A Thermochemical Process Using Expanding Plasma for Nitriding Thin Molybdenum Films at Low Temperature

“…Results show that a maximum of diimide is produced in the two gas mixtures at about 5% of H 2 injected in the plasma. According to Stothard et al [40] two main reactions pathway occurring in the gas volume produce diimide molecules, they are: However, the surface reactions can also be efficient to produce diimide molecules in a reactor configuration with a large S/V ratio. According to Huang et al [41], the reaction NH s +NH s →N 2 H 2 can be the primary mechanism for diimide molecules formation.…”