### Abstract

The decomposition kinetics of CH_{3}NHNH_{2} (monomethylhydrazine) is studied with ab initio transition state theory-based master equation analyses. The simple NN and CN bond fissions to produce the radicals CH_{3}NH + NH_{2} or CH_{3} + NHNH_{2} are expected to dominate the decomposition kinetics. The transition states for these two bond fissions are studied with variable reaction coordinate transition state theory employing directly determined CASPT2/aug-cc-pVDZ interaction energies. Orientation independent corrections for limitations in the basis set and for the effects of conserved mode geometry relaxation are included. The bond dissociation energies are evaluated at the QCISD(T)/CBS//B3LYP/6-311++G(d,p) level. The transition state theory analysis directly provides high pressure dissociation and recombination rate coefficients. Predictions for the pressure dependence and product branching in the dissociation of CH_{3}NHNH _{2} are obtained by solving the master equation.

Original language | English (US) |
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Pages (from-to) | 425-432 |

Number of pages | 8 |

Journal | Proceedings of the Combustion Institute |

Volume | 33 |

Issue number | 1 |

DOIs | |

State | Published - Jan 10 2011 |

### All Science Journal Classification (ASJC) codes

- Chemical Engineering(all)
- Mechanical Engineering
- Physical and Theoretical Chemistry

### Keywords

- Ab initio
- Master equation
- Monomethylhydrazine
- Transition state theory

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## Cite this

_{3}NHNH

_{2}).

*Proceedings of the Combustion Institute*,

*33*(1), 425-432. https://doi.org/10.1016/j.proci.2010.05.010