Scalar and vector properties of the NO(v′=0) produced from the reaction O(1D)+N2O→NO+NO

Abstract

We have measured the product state-selected differential cross-section ͑DCS͒, and the rotational angular momentum polarization, together with the energy distributions for the reaction O( 1 D) ϩN 2 O→NOϩNO by utilizing Doppler-resolved polarization spectroscopy. The reaction dynamics of the vibrational channel forming the product NO(vЈϭ0) is discussed based on both the scalar and vector properties. The product rotational and center-of-mass translational energy distributions are described as Boltzmann distributions with T rot Ϸ10 000 K and T tr Ϸ13 000 K, respectively. These energy distributions are close to statistical predictions. The product DCS has substantial intensities over the whole angular range with a slight preference for backward scattering. The product rotational angular momentum vector jЈ does not have a noticeable angular correlation with either k or kЈ ͑the relative velocity vectors of the reactant and product, respectively͒. This nearly isotropic angular distribution of jЈ indicates that both in-plane and out-of-plane motions of the collisional ONNO complex contribute to the product rotation to almost the same degree. Considering that this reaction has no potential well deep enough for the formation of a long-lived complex, these nearly statistical scalar and isotropic vector properties suggest that the energy redistribution among the internal modes of the collisional ONNO complex efficiently takes place. It implies that there are strong couplings among the internal modes.

Product state distribution and stereodynamics of the O(1D) + N2O reaction

“…In order to explore the real dynamics of these two reactions, we determined the differential cross section (DCS) and the angular distribution of the rotational angular momentum vector for the products of the two reactions [12,14];…”

“…We also measured the state-selective differential cross section and the angular distribution of the product rotational angular vector using the photo-initiated Doppler-resolved polarization spectroscopy [12] and propose the complete picture of the reaction dynamics in the O( 1 D) + N 2 O → 2NO reaction.…”

On the ultraviolet absorption of nitrous oxide and its van der Waals complexes

“…First, its dimer was one of the first van der Waals complexes investigated in a supersonic jet expansion [5], and second, it has widely been used as precursor molecule for O( 1 D) atoms, in particular for investigating the bimolecular reaction (1) which can be initiated with relative experimental ease by 193 nm laser radiation in a N 2 O sample [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. Frequently, such experiments are performed in supersonic expansions where low temperature and high number density favor the formation of N 2 O van der Waals complexes which are likely to affect the course of the reaction [7,8,19,20].…”

Crossed molecular beam studies on the reaction dynamics of O(D1)+N2O

“…There is considerable experimental [1][2][3][4][5][6][7][8][9][10][11][12][13] and theoretical [14][15][16][17][18][19][20][21][22][23][24][25] attention on the reaction dynamics of O͑ 1 D͒ +N 2 O. The reaction has two major product channels which are highly exothermic: Both channels are fast ͑close to the gas kinetic limit͒ and without potential energy barriers.…”

“…͑R1͒ is thought to be the primary source of NO in the upper stratosphere, where highly reactive O͑ 1 D͒ is produced by UV photolysis of ozone. [6][7][8][9][10] They measured the vibrational distributions of the new and old NO by using isotope labeled 18 O͑ 1 D͒ reactant. To our knowledge, there is no experimental literature on the reaction dynamics of ͑R2͒ so far.…”