Macheret received his PhD degree from
Kurchatov Institute in 1985. He worked at the Ohio State University, Princeton University, and Lockheed Martin Aeronautics Company. He was a professor at
Purdue University School of Aeronautics and Astronautics in 2014-2024. He was elected as a fellow of the American Institute of Aeronautics and Astronautics (AIAA) and received the AIAA Plasmadynamics and Lasers Award in 2022.
Macheret formulas The formulas are used for estimation of non-equilibrium rate coefficients of the simple-exchange
endothermic reaction: XY(v)+Z \rightarrow X+YZ. Such reactions appear in low-temperature nonequilibrium plasmas where substantial fraction of energy input goes into vibrational excitation of molecules. The formulas are obtained by applying classical mechanics methods for high temperatures and semi-classical approximation for moderate temperatures. Assumptions: 1. Translational-vibrational non equilibrium: T>T_v or T. 2. Collisions are
collinear and rotational energy effects are negligible. 3. The duration of collision is much faster than the period of molecule vibration. 4. The vibrational energy obeys
Boltzmann distribution. Formulas and relations: :k(T,T_v)=Z(T,T_v) k^0(T) Nonequilibrium factor in the high temperature case (T \geq \theta): :Z(T,T_v)=\exp\left[ -\frac{E_a-W}{\alpha_M T_v + (1-\alpha_M)T} - \frac{W}{T}+\frac{E_a}{T}\right] :\alpha_M=\frac{m_Y(m_X+m_Y+m_Z)}{(m_X+m_Y)(m_Y+m_Z)} :W=E_a(1-\frac{f_v}{\alpha_M}) Nonequilibrium factor in the low temperature case (T): :Z(T,T_v)=\left[f_v\exp(-\frac{T_v}{\theta})+(1-f_v)\exp(-\frac{T}{\theta})\right]^{E_a/\theta}\exp\left(\frac{E_a}{T}\right) == References ==