Kinetics of the O + HCNO Reaction

Abstract

The kinetics of the O + HCNO reaction were investigated by a relative rate technique using infrared diode laser absorption spectroscopy. Laser photolysis (355 nm) of NO2 was used to produce O atoms, followed by O atom reactions with CS2, NO2, and HCNO, and infrared detection of OCS product from the O + CS2 reaction. Analysis of the experiment data yields a rate constant of k1= (9.84 +/- 3.52) x 10-12 exp[(-195 +/- 120)/T)] (cm3 molecule-1 s-1) over the temperature range 298-375 K, with a value of k1 = (5.32 +/- 0.40) x 10-12 cm3 molecule-1 s-1 at 298 K. Infrared detection of product species indicates that CO producing channels, probably CO + NO + H, dominate the reaction.

Theoretical studies and topological analysis of the electron density of clusters of O3 with HNCO and HCNO

“…Several experimental and computational studies on the kinetics of HCNO have been reported [16][17][18][19][20][21][22][23]. Despite the potential importance of O 3 , HNCO and HCNO we could not find neither experimental nor theoretical report on O 3 -HNCO or O 3 -HCNO interactions.…”

Product channels in the 193-nm photodissociation of HCNO (fulminic acid)

“…Our previous studies [2][3][4][5][6] show that HCNO is a highly reactive molecule. Many secondary reactions following the photolysis can therefore occur.…”

“…HCNO (fulminic acid) is the less stable isomer of isocyanic acid; the kinetics of several reactions involving HCNO has only recently been studied [3][4][5][6][7]. There is only one previous study of the photochemistry of HCNO, an infrared laser spectroscopic study from our laboratory that identified five separate photolysis channels in the 248 nm photodissociation of this molecule [8].…”

Product Channels of the CN + HCNO Reaction

“…The resulting signals were then converted to absolute concentrations using the peak−peak amplitudes and HITRAN line strengths. 38 In Figure 2, we show the yield of unlabeled 14 Assuming that all of the detected 14 N 16 O (except for the HCNO photolysis background) originates from channel 1a, we can estimate a branching fraction into 1a by comparing the yield of 14 In a second series of experiments, we attempted to detect HCN products from channel 1b, using a newly acquired laser diode at ∼3250 cm −1 . The lower panel of Figure 1 shows HCN transient signals with and without the ICN precursor.…”