A consistent model for the thermal decomposition of NCN3 and the singlet- triplet relaxation of NCN
A consistent model for the thermal decomposition of NCN3 and the singlet- triplet relaxation of NCN
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NCN3 热分解和 NCN 单线态-三线态弛豫的一致模型
DOI:
10.1002/kin.20739
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发表时间:
2013
影响因子:
1.5
通讯作者:
G. Friedrichs
中科院分区:
文献类型:
--
作者:
J. Dammeier;B. Oden;G. Friedrichs
The thermal decomposition of cyanogen azide (NCN3) and the subsequent collision‐induced intersystem crossing (CIISC) process of cyanonitrene (NCN) have been investigated by monitoring excited electronic state1NCN and ground state3NCN radicals. NCN was generated by the pyrolysis of NCN3behind shock waves and by the photolysis of NCN3at room temperature. Falloff rate constants of the thermal unimolecular decomposition of NCN3in argon have been extracted from1NCN concentration–time profiles in the temperature range 617 K <T< 927 K and at two different total densities:k(ρ ≈ 3 × 10−6mol/cm3)/s−1=4.9 × 109× exp (−71±14 kJ mol−1/RT) (± 30%);k(ρ ≈ 6 × 10−6mol/cm3)/s−1=7.5 × 109× exp (‐71±14 kJ mol−1/RT) (± 30%). In addition, high‐temperature1NCN absorption cross sections have been determined in the temperature range 618 K <T< 1231 K and can be expressed by σ /(cm2/mol)= 1.0 × 108−6.3 × 104K−1×T(± 50%). Rate constants for the CIISC process have been measured by monitoring3NCN in the temperature range 701 K <T< 1256 K resulting inkCIISC(ρ ≈ 1.8 ×10−6mol/cm3)/ s−1=2.6 × 106× exp (‐36±10 kJ mol−1/RT) (± 20%),kCIISC(ρ ≈ 3.5×10−6mol/cm3)/ s−1= 2.0 × 106× exp (−31±10 kJ mol−1/RT) (± 20%),kCIISC(ρ ≈ 7.0×10−6mol/cm3)/ s−1=1.4 × 106× exp (−25±10 kJ mol−1/RT) (± 20%). These values are in good agreement with CIISC rate constants extracted from corresponding1NCN measurements. The observed nonlinear pressure dependences reveal a pressure saturation effect of the CIISC process. © 2012 Wiley Periodicals, Inc. Int J Chem Kinet 45: 30–40, 2013
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1999
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1960
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1970
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1993
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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