Lambert H M, Davis E W, Tokel O, Dixit A A, Houston P L
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853-1301, USA.
J Chem Phys. 2005 May 1;122(17):174304. doi: 10.1063/1.1888579.
The photodissociation of N(2)O at wavelengths near 130 nm has been investigated by velocity-mapped product imaging. In all, five dissociation channels have been detected, leading to the following products: O((1)S)+N(2)(X (1)Sigma), N((2)D)+NO(X (2)Pi), N((2)P)+NO(X (2)Pi), O((3)P) + N(2)(A (3)Sigma(+) (u)), and O((3)P) + N(2)(B (3)Pi(g)). The most significant channel is to the products O((1)S) + N(2)(X(1)Sigma), with strong vibrational excitation in the N(2). The O((3)P) + N(2)(A,B):N((2)D,(2)P) + NO branching ratio is measured to be 1.4 +/- 0.5, while the N(2)(A) + O((3)P(J)):N(2)(B) + O((3)P(J)) branching ratio is determined to be 0.84+/-0.09. The spin-orbit distributions for the O((3)P(J)), N((2)P(J)), and N((2)D(J)) products were also determined. The angular distributions of the products are in qualitative agreement with excitation to the N(2)O(D (1)Sigma(+)) state, with participation as well by the (3)Pi(v) state.
通过速度映射产物成像研究了波长接近130nm时N₂O的光解离。总共检测到五个解离通道，产生以下产物：O(¹S)+N₂(X¹Σ)、N(²D)+NO(X²Π)、N(²P)+NO(X²Π)、O(³P)+N₂(A³Σ⁺(u))和O(³P)+N₂(B³Π(g))。最主要的通道是生成产物O(¹S)+N₂(X¹Σ)，N₂中有强烈的振动激发。测得O(³P)+N₂(A,B):N(²D,(²P)+NO的分支比为1.4±0.5，而N₂(A)+O(³P(J)):N₂(B)+O(³P(J))的分支比确定为0.84±0.09。还确定了O(³P(J))、N(²P(J))和N(²D(J))产物的自旋轨道分布。产物的角分布与激发到N₂O(D¹Σ⁺)态在定性上相符，同时(³Π(v))态也有参与。
