Photodissociation Dynamics of Nitrous Oxide near 145 nm: The O(1S0) and O(3PJ=2,1,0) Product Channels,The Journal of Physical Chemistry A

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Photodissociation Dynamics of Nitrous Oxide near 145 nm: The O(1S0) and O(3PJ=2,1,0) Product Channels
The Journal of Physical Chemistry A ( IF 2.7 ) Pub Date : 2018-02-26 00:00:00 , DOI: 10.1021/acs.jpca.7b10756
Daofu Yuan ₁ , Shengrui Yu ₂ , Ting Xie ₁ , Wentao Chen ₁ , Siwen Wang ₁ , Yuxin Tan ₁ , Tao Wang ₃ , Kaijun Yuan ₃ , Xueming Yang _{1,

3} , Xingan Wang ₁

Affiliation

We report the study of photodissociation dynamics of nitrous oxide in the vacuum ultraviolet region, using the time-sliced velocity map ion imaging technique. Ion images of the O(¹S₀) and O(³P_J=2,1,0) products were measured at nine photolysis wavelengths from 142.55 to 148.79 nm. The product channels O(¹S₀) + N₂(X¹Σ_g⁺) and O(³P_J=2,1,0) + N₂(A³Σ_u⁺) have been observed. For these dissociation channels, the total kinetic energy releases of the dissociated products were acquired. With vibrational structures of the N₂ coproducts partially resolved in the experimental images, the branching ratios of different vibrational states of the N₂ coproducts were determined, and the vibrational state specific anisotropy parameters (β values) were derived. Analysis shows that the O(¹S₀) + N₂(X¹Σ_g⁺) channel is primarily formed via nonadiabatic couplings between the C (¹Π) state and the higher-lying D (¹Σ⁺) state of the N₂O. A moderate rotational excitation and high vibrational excitation of N₂(X¹Σ_g⁺) products have been observed through this pathway. On the other hand, for the O(³P_J=2,1,0) + N₂(A³Σ_u⁺) channels, where a slightly higher rotational excitation of N₂ coproducts have been observed, the possible pathway would be via nonadiabatic couplings from the C (¹Π) state to the lower-lying A(¹Σ^–)state.

中文翻译：

一氧化二氮在145 nm附近的光解离动力学：O（¹ S ₀）和O（³ P _{J = 2,1,0}）产物通道

我们报告使用时间切片速度图离子成像技术在真空紫外区域中一氧化二氮的光解离动力学的研究。在从142.55至148.79 nm的9个光解波长下测量了O（¹ S ₀）和O（³ P _{J = 2,1,0}）产物的离子图像。产品通道O（¹ š ₀）+ N ₂（X ¹ Σ_克⁺）和O（³ P _{Ĵ = 2,1,0}）+ N ₂（A ³ Σ _ù⁺）已被观察到。对于这些离解通道，获得了离解产物的总动能释放。与N的振动结构₂在实验用图像部分解决副产物，所述N个的不同的振动状态的分支比₂副产物被测定，并且振动状态特定各向异性参数（β值）导出的。分析表明，O（¹ š ₀）+ N ₂（X ¹ Σ_克⁺）通道主要通过非绝热联轴器C（之间形成^1个Π）状态和位于较高d（¹ Σ ⁺）的N个的状态₂ O.适度转动激发以及N高振动激发₂（X ¹ Σ_克⁺）产品已通过该途径观察。在另一方面，对于O（³ P _{Ĵ = 2,1,0}）+ N ₂（A ³ Σ _Ù⁺）通道，其中N的略高转动激发₂已经观察到副产物，可能的途径将是经由来自C（非绝热接头¹ Π）状态到卧下-A（¹ Σ ^-）的状态。

更新日期：2018-02-26

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