Thermal Decomposition of NCN: Shock-Tube Study, Quantum Chemical Calculations, and Master-Equation Modeling.
Thermal Decomposition of NCN: Shock-Tube Study, Quantum Chemical Calculations, and Master-Equation Modeling.
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NCN 的热分解:激波管研究、量子化学计算和主方程建模。
DOI:
10.1021/acs.jpca.5b01347
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
M. Olzmann
中科院分区:
文献类型:
--
作者:
A. Busch;Núria González;G. Lendvay;M. Olzmann
The thermal decomposition of cyanonitrene, NCN, was studied behind reflected shock waves in the temperature range 1790-2960 K at pressures near 1 and 4 bar. Highly diluted mixtures of NCN3 in argon were shock-heated to produce NCN, and concentration-time profiles of C atoms as reaction product were monitored with atomic resonance absorption spectroscopy at 156.1 nm. Calibration was performed with methane pyrolysis experiments. Rate coefficients for the reaction (3)NCN + M → (3)C + N2 + M (R1) were determined from the initial slopes of the C atom concentration-time profiles. Reaction R1 was found to be in the low-pressure regime at the conditions of the experiments. The temperature dependence of the bimolecular rate coefficient can be expressed with the following Arrhenius equation: k1(bim) = (4.2 ± 2.1) × 10(14) exp[-242.3 kJ mol(-1)/(RT)] cm(3) mol(-1) s(-1). The rate coefficients were analyzed by using a master equation with specific rate coefficients from RRKM theory. The necessary molecular data and energies were calculated with quantum chemical methods up to the CCSD(T)/CBS//CCSD/cc-pVTZ level of theory. From the topography of the potential energy surface, it follows that reaction R1 proceeds via isomerization of NCN to CNN and subsequent C-N bond fission along a collinear reaction coordinate without a tight transition state. The calculations reproduce the magnitude and temperature dependence of the rate coefficient and confirm that reaction R1 is in the low-pressure regime under our experimental conditions.
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DOI:
10.1021/jp1043046
发表时间:
2010
期刊:
The journal of physical chemistry. A
影响因子:
--
作者:
J. Dammeier;G. Friedrichs
通讯作者:
G. Friedrichs
DOI:
10.1021/jp208715c
发表时间:
2011
期刊:
The journal of physical chemistry. A
影响因子:
--
作者:
J. Dammeier;G. Friedrichs
通讯作者:
G. Friedrichs
DOI:
10.1039/c1cp22123j
发表时间:
2012
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
作者:
J. Dammeier;N. Faßheber;G. Friedrichs
通讯作者:
G. Friedrichs
影响因子:
1.5
作者:
J. Dammeier;B. Oden;G. Friedrichs
通讯作者:
G. Friedrichs
DOI:
10.1039/c4cp01107d
发表时间:
2014
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
作者:
N. Faßheber;J. Dammeier;G. Friedrichs
通讯作者:
G. Friedrichs