Collisional quenching of NCO () by some inorganic molecules

Hu, Changjin; Liu, Yunzhen; Li, Pei; Dai, Jinghua; Chen, Yang; Chen, Congxiang; Ma, Xingxiao

doi:10.1016/s0301-0104(03)00087-9

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…The pulsed laser photolysis/laser-induced fluorescence (LP-LIF) experiments were performed in a stainless steel flow reactor, which is similar to those described in detail previously. − Briefly, HCF radicals were generated from the photolysis of CHFBr 2 with the softly focused 213 nm irradiation of a frequency-quintupled Nd:YAG laser (New wave, repetition rate of 10 Hz). A 50 cm focal length quartz lens focused the beam into the center of the reaction cell.…”

Section: Methodsmentioning

confidence: 99%

Time-Resolved Kinetic Studies on Quenching of HCF(ÃA‘‘) by Alkane and Alcohol Molecules

Yang

Zhang

et al. 2005

J. Phys. Chem. A

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HCF(X1A') radicals were produced by laser photolysis of CHFBr2 at 213 nm and were electronically excited from the ground state to A1A''(030) at 492.7 nm with a dye laser pumped by a Nd:YAG laser. With the analysis of the lifetime of the time-resolved total fluorescence signals collected in the reaction cell where the total pressure was fixed to be 14.0 Torr, the quenching data of HCF(A1A'') by alkane and alcohol molecules at room temperature were derived from variation of pseudo-first-order rate constant with different quencher pressures. It is found that the quenching rate constants are close to the collision rate constants (10(-10) cm3 molecule(-1) s(-1)), indicating the long-range attractive forces between the collision partners play an important role in the entrance channel of quenching process. Several kinetic models were applied to analyze the mechanism of the quenching process. The complex formation cross sections are calculated with the collision complex model. Correlations of the quenching rate constant for the removal of the HCF(A1A'') state with ionization potential of the quenching partners show that the insertion reactive mechanism is probably the dominant reaction channel, which is analogous to the behaviors of other three-atom carbenes in corresponding electronic states.

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Section: Methodsmentioning

confidence: 99%

Time-Resolved Kinetic Studies on Quenching of HCF(ÃA‘‘) by Alkane and Alcohol Molecules

Yang

Zhang

et al. 2005

J. Phys. Chem. A

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“…The molecule is linear in both the ground and the excited electronic state, and the application of the Franck–Condon principle predicts maximum intensity in the Δν 2 = 0 transitions. Radiative lifetimes were measured to be 350 ± 30 ns in the A 2 Σ + (0,0,0) state , and 60 ns in the B 2 Π(0,0,0) state. , Collision quenching rates in the A state are reported at room temperature, − and the fluorescence quenching was measured in flames . Moreover, the absorption coefficients were determined at 1470 K in shock tube experiments at 440.479 and 304.681 nm in the A 2 Σ + (0,0,0)–X 2 Π i (0,0,0) and B 2 Π(1,0,0)–X 2 Π i (0,0,0) transitions, respectively.…”

Section: Introductionmentioning

confidence: 99%

NCO Quantitative Measurement in Premixed Low Pressure Flames by Combining LIF and CRDS Techniques

Lamoureux¹,

Mercier²,

Pauwels³

et al. 2011

J. Phys. Chem. A

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NCO is a short-lived species involved in NO(x) formation. It has never been quantitatively measured in flame conditions. In the present study, laser-induced fluorescence (LIF) and cavity ring-down spectroscopy (CRDS) were combined to measure NCO radical concentrations in premixed low-pressure flames (p = 5.3 kPa). NCO LIF excitation spectrum and absorption spectrum (using CRDS) measured in a stoichiometric CH(4)/O(2)/N(2)O/N(2) flame were found in good agreement with a simulated spectrum using PGOPHER program that was used to calculate the high-temperature absorption cross section of NCO in the A(2)Σ(+)-X(2)Π transition around 440.479 nm. The relative NCO-LIF profiles were measured in stoichiometric CH(4)/O(2)/N(2)O/N(2) flames where the ratio N(2)O/O(2) was progressively decreased from 0.50 to 0.01 and in rich CH(4)/O(2)/N(2) premixed flames. Then, the LIF profiles were converted into NCO mole fraction profiles from the absorption measurements using CRDS in a N(2)O-doped flame.

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Ab initio quantum chemical studies of reaction mechanism for CH2CO with NCO

Zhang

2006

Journal of Molecular Structure: THEOCHEM

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Collisional quenching of NCO () by some inorganic molecules

Cited by 3 publications

References 22 publications

Time-Resolved Kinetic Studies on Quenching of HCF(ÃA‘‘) by Alkane and Alcohol Molecules

Time-Resolved Kinetic Studies on Quenching of HCF(ÃA‘‘) by Alkane and Alcohol Molecules

NCO Quantitative Measurement in Premixed Low Pressure Flames by Combining LIF and CRDS Techniques

Ab initio quantum chemical studies of reaction mechanism for CH2CO with NCO

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