Department of Chemistry, University of California, Davis, Davis, California 95616, USA.
J Chem Phys. 2011 Oct 7;135(13):134319. doi: 10.1063/1.3644778.
The predissociation of N(2) from the rotational levels in the o(1)∏(u) (v(') = 2) and b(') (1)Σ(u) (v(') = 8) bands has been studied in the wavenumber (or energy) range from 109 350 cm(-1) (13.5577 eV) to 109 580 cm(-1) (13.5862 eV) by time-sliced velocity-mapped imaging technique with VUV photoionization detection of the fragments. These levels were excited from the ground state of N(2) (X(1)Σ(g) (+), v(") = 0) levels using an unfocused vacuum ultraviolet (VUV) laser via a one-photon process. The same VUV laser is used to ionize the metastable N ((2)D(o)) produced from the predissociation process and the time-sliced velocity-mapped imaging technique is used to determine their velocity and angular distributions. Two different theoretical methods developed, respectively, by Kim et al. [J. Chem. Phys. 125, 133316 (2006) and Zande [J. Chem. Phys. 107, 9447 (1997)] were used to calculate the anisotropic parameters for the predissociation to the channel N((4)S(o)) + N((2)D(o)) to compare with the observed value for each of the rotational levels. Very good agreement with the experimental results was obtained for both methods. Possible predissociation mechanisms were predicted from the measurements and calculations.
通过时间切片速度映射成像技术，结合碎片的真空紫外光电离检测，研究了 o(1)∏(u) (v(') = 2) 和 b(') (1)Σ(u) (v(') = 8) 带中 N(2)从旋转能级的预解离，研究范围在 109 350 cm(-1) (13.5577 eV) 到 109 580 cm(-1) (13.5862 eV)。这些能级是通过单光子过程从 N(2) (X(1)Σ(g) (+), v(") = 0) 基态激发到未聚焦的真空紫外 (VUV) 激光。同样的 VUV 激光用于电离预解离过程中产生的亚稳 N ((2)D(o))，并使用时间切片速度映射成像技术来确定它们的速度和角分布。分别由 Kim 等人开发的两种不同的理论方法 [J. Chem. Phys. 125, 133316 (2006) 和 Zande [J. Chem. Phys. 107, 9447 (1997)] 用于计算到 N((4)S(o)) + N((2)D(o)) 通道的预解离各向异性参数，以与每个旋转能级的观测值进行比较。两种方法都与实验结果非常吻合。从测量和计算预测了可能的预解离机制。
