Laser-induced fluorescence measurements of NCN in low-pressure CH4/O2/N2 flames and its role in prompt NO formation

Diode laser absorption measurement and analysis of HCN in atmospheric-pressure, fuel-rich premixed methane/air flames

“…This result has been supported by NCN detection in low-pressure CH 4 /air flames [16,17] and shock tubes [18], although the measurements were reported to be semiquantitative. The modeling study performed in [18] to simulate the CH absorption profiles also yielded NCN and H as principal products of the reaction between CH and N 2 .…”

Thermal Decomposition of NCN: Shock-Tube Study, Quantum Chemical Calculations, and Master-Equation Modeling

“…The temperature dependence of k 1 bim can be expressed by the following Arrhenius equation: (4) where the statistical error was estimated to be 50%. A systematic uncertainty may arise mainly from the calibration but is difficult to assess.…”

Collisional Relaxation of NCN: An Experimental Study with Laser-Induced Fluorescence

“…These authors detected and assigned diagonal and off-diagonal transitions and also determined fluorescence lifetimes and quenching cross sections for different bath gases. In recent years, LIF measurements at high temperatures were performed to directly study the chemistry of NCN in flames [13,15,18,[39][40][41].…”

“…In combustion chemistry, the kinetics of the cyanonitrene radical, NCN, has recently attracted attention [4][5][6][7][8][9][10][11] because NCN is considered an important intermediate in the formation of so-called prompt NO in hydrocarbon flames under fuel-rich conditions [12][13][14][15][16][17][18][19][20]. Cyanonitrene is a linear diradical with a 3 − g electronic ground state [21,22] and was shown to be formed under combustion conditions in the spin-allowed reaction CH(…”