Citation: YU Hong-Jing, XIA Wen-Wen, SONG Li-Guo, DING Yang, HAO Yu, KANG Li-Qiang, PAN Xin-Xiang, YAO Li. Anharmonic Effect of the Decomposition Reaction in High-Temperature Combustion of Monomethylhydrazine Radicals[J]. Acta Physico-Chimica Sinica, ;2017, 33(11): 2207-2218. doi: 10.3866/PKU.WHXB201705227
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In this work, the harmonic and anharmonic rate constants of the decomposition reaction of monomethylhydrazine (MMH) radicals have been calculated by using transition state (TS) and Rice-Ramsperger-Kassel-Marcus (RRKM) theories with either MP2 or B3LYP method at 6-311++G(3df,2p) basis set, respectively. The reaction mechanism and anharmonic effect of the MMH radicals are studied in detail and both of the harmonic and anharmonic rate constants increase sharply with increasing temperature in the canonical system. In the microcanonical system, these constants also show sharp increase with the energies. Overall, the anharmonic effect becomes more pronounced with the increasing temperature or energy in the canonical and microcanonical systems, respectively. These results indicate that the anharmonic effect of the decomposition reaction of MMH radicals is quite significant and cannot be ignored.
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Keywords:
- Anharmonic effect,
- Unimolecular reaction,
- RRKM theory,
- Rate constant
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