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arXiv 2201.04321physics.chem-ph
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N-$_{3}^{+}$的光解动力学

Photodissociation dynamics of N$_{3}^{+}$

Sarbani Patra, Juan Carlos San Vicente Veliz, Debasish Koner, Evan J. Bieske, Markus Meuwly

摘要:

研究了N-$_3^+$从其$^3 Σ_{\rm g}^{-}$基态激发到第一激发单重态和三重态的光解动力学。对于N $_3^+$,使用高水平电子结构计算构建了与线性几何中的$^1 Δ_{\rm g}$和$^3 Π_{\rm u}$状态相关的$^1$ A $'$、$^1$ A $''$和$^3$ A $'$电子状态的三维势能面,并表示为再现核。在MRCI+Q/aug-cc-pVTZ理论水平上计算了参考{ \it ab initio}能量。为了研究激发态的光解离动力学,由垂直激发基态分布确定了N-$_2$产物的转动和振动分布$P(v')$和$P(j')$.由于基态$^3$ A $^{''}$ PES和激发态的不同形状,在双原子碎片中产生可观的角动量$j' \sim 60$。在激发态的寿命延长到至少50 ps。值得注意的是,从采样的初始条件从热合奏和从基态波函数的维格纳分布的结果是可比的。

英文摘要:

The photodissociation dynamics of N$_3^+$ excited from its $^3 Σ_{\rm g}^{-}$ ground to the first excited singlet and triplet states is investigated. Three dimensional potential energy surfaces for the $^1$A$'$, $^1$A$''$, and $^3$A$'$ electronic states, correlating with the $^1 Δ_{\rm g}$ and $^3 Π_{\rm u}$ states in linear geometry, for N$_3^+$ are constructed using high level electronic structure calculations and represented as reproducing kernels. The reference {\it ab initio} energies are calculated at the MRCI+Q/aug-cc-pVTZ level of theory. For following the photodissociation dynamics in the excited states, rotational and vibrational distributions $P(v')$ and $P(j')$ for the N$_2$ product are determined from vertically excited ground state distributions. Due to the different shapes of the ground state $^3$A$^{''}$ PES and the excited states, appreciable angular momentum $j' \sim 60$ is generated in the diatomic fragments. The lifetimes in the excited states extend to at least 50 ps. Notably, results from sampling initial conditions from a thermal ensemble and from the Wigner distribution of the ground state wavefunction are comparable.

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