Bond dissociation energy of N2 measured by state-to-state resolved threshold fragment yield spectra.
Bond dissociation energy of N2 measured by state-to-state resolved threshold fragment yield spectra.
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N2 的键解离能通过态间分辨阈值片段产率谱测量。
DOI：
10.1063/5.0187003
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发表时间：
2024
期刊：
影响因子：
--
通讯作者：
Yuxiang Mo
中科院分区：
文献类型：
--
作者：
Peng Wang;Shiyan Gong;Yixuan Li;Yuxiang Mo
N2键解离能的精确测定对于热化学数据库和理论计算至关重要。然而，关于其确切价值一直存在争议。在本研究中，我们采用速度图成像方法结合极紫外激光来测量N2在N(2D)+N(2D)光解离通道中的阈值碎片产率(TFY)光谱。通过对碎片速度图图像上的小圆形区域内的信号进行积分，我们能够获得九个不同解离阈值的 TFY 谱。这些光谱是 N2(J") 分子的旋转态解析和涉及 N(2D) 片段的解离通道的自旋轨道态解析。通过使用维格纳阈值定律模拟TFY谱并对综合数据集进行统计分析，我们确定N2键解离能为78 691.09±0.15 cm-1。这项工作现在将 N2 列为少数具有亚波数精度测量键解离能的双原子分子之一。
The precise determination of the bond dissociation energy of N2 is crucial for thermochemistry database and theoretical calculations. However, there has been ongoing debate regarding its exact value. In this study, we used the velocity map imaging method combined with an extreme ultraviolet laser to measure the threshold fragment yield (TFY) spectra of N2 in the N(2D) + N(2D) photodissociation channels. By integrating the signals within a small circular area on the fragment velocity map images, we were able to obtain TFY spectra at nine different dissociation thresholds. These spectra are rotational state-resolved for the N2(J″) molecules and spin-orbit state-resolved for the dissociation channels involving N(2D) fragments. By employing the Wigner threshold law to simulate the TFY spectra and conducting statistical analysis on the comprehensive dataset, we determined the N2 bond dissociation energy to be 78 691.09 ± 0.15 cm-1. This work now places N2 among the few diatomic molecules with bond dissociation energies measured at sub-wavenumber precision.
影响因子：
2.8
作者：
Boyarkin, Oleg V.;Koshelev, Maxim A.;Polyansky, Oleg L.
通讯作者：
Polyansky, Oleg L.