Study of the HNO + HNO and HNO + NO reactions by intracavity laser spectroscopy

Abstract

Flash photolysis of CH3CHO and H2CO in the presence of NO has been investigated by the intracavity laser spectroscopy technique. The decay of HNO formed by the reaction HCO + NO * HNO + CO was studied a t NO pressures of 6.&380 torr. At low NO pressure HNO was found to decay by the reaction HNO + HNO 7 N20 + HzO. The rate constant of this reaction was determined to he kl = (1.5 f 0.8) X cm"/s. A t high NO pressure the reaction HNO + NO -products was more important, and its rate constant was measured to he k:! = (5 f 1.5) X cm3/s. NO;? was detected as one of the products of this reaction.Alternative mechanisms for this reaction are discussed.

Efficient surface formation route of interstellar hydroxylamine through NO hydrogenation. II. The multilayer regime in interstellar relevant ices

“…The existence of this complex has already been suggested by several groups, [53][54][55][56] (NO) 2 +H → HNO · NO.…”

“…A possible mechanism to form N 2 O is through HNO dimerization and the subsequent dissociation of the formed hyponitrous acid, 51,53,54 …”

Laser absorption spectroscopy diagnostics of nitrogen-containing radicals in low-pressure hydrocarbon flames doped with nitrogen oxides

“…Mech underpredicts the absolute concentration in this maximum evaluated from the experimental data using the absorption cross section measured by Cheskis et al47 The window Ñow only slightly a †ects the absorption of indicating that is present in the Ñame much closer NH 2 NH 2 to the center of the Ñame than HNO.…”

“…The electronic origin is 13 154.38 cm~1, and to date 12 vibrational levels of the A 3 1AA state have been observed in the region 550È770 nm via transition from the (000) level of the X 3 1A@ state. 22,23,25 The absorption cross section has been reported only for the rotational line R(6) of the K@ \ 4ÈKA \ 3 subband of the (100)È(000) band.47 This cross section was estimated based on the HCO radical cross section, suggesting total conversion of HCO formed by Ñash photolysis of acetaldehyde to HNO via the reaction HCO ] NO ] HNO ] CO. 47 The ICLAS spectrum observed in this range is shown in Fig. 4(b).…”

Intracavity Laser Absorption Spectroscopy for flame diagnostics

“…ICLAS was proposed in 1970 10 and has been reviewed in several papers 11,12 . Since then ICLAS was applied in a variety of fields: atmospheric extinction studies, 11,13 molecular spectroscopy, 12‐21 simulation of planetary atmospheres, 19 process control and plasma diagnostics, 22 studies of dynamics of excited states and kinetics of chemical reactions, 23‐27 etc. Harris 28,29 pointed to the large potential advantages of ICLAS for combustion diagnostics, and was probably the first to use ICLAS for combustion studies.…”