We present a detailed investigation about the vibronic (vibration-electronic) transition parameters as Franck-Condon (FC) factors, r-centroids, Einstein coefficients, and radiative lifetimes for some bands of the second positive (${\mathrm{C}}^3{\Pi }_{\mathrm{u}}-{\mathrm{B}}^3{\Pi }_{\mathrm{g}}$) and Herman infrared (${\mathrm{C}}^{″5}{\Pi }_{\mathrm{u}}-{\mathrm{A}}^{\prime 5}{\Sigma }_{\mathrm{g}}^{+}$) band systems of N₂. For such, novel and accurate functional forms are reported. To achieve our goals, ab initio electronic energies have been obtained employing the highly accurate multireference configuration interaction (MRCI) method with Davidson modification associated with aug-cc-pVXZ (X = 5,6) basis set. The present analytical representations were ‘constructed by fitting such accurate energies utilizing a least-squares fitting procedure. By considering our Analytical Potential Energy Curves (APECs), we derived molecular properties as spectroscopic parameters, rovibrational levels, and classical turning points. Our results are compared with available experimental and theoretical data. In addition, we demonstrate that observed perturbations in the experimental spectrum of the second positive system can be also attributed to N₂(C″⁵Π_u) and ${\mathrm{N}}_2\left({\mathrm{A}}^{\prime 5}{\Sigma }_{\mathrm{g}}^{+}\right)$. Other important effects of these perturbations are presented.

我们提供了有关第二正向（某些正弦带）的振动（振动-电子）跃迁参数的详细调查，包括Franck-Condon（FC）因子，r重心，爱因斯坦系数和辐射寿命。${\mathrm{C}}^3{\Pi }_{\mathrm{ü}}-{\mathrm{乙}}^3{\Pi }_{\mathrm{G}}$）和赫尔曼红外线（${\mathrm{C}}^{\text{'}\text{'}5}{\Pi }_{\mathrm{ü}}-{\mathrm{一种}}^{\prime 5}{\Sigma }_{\mathrm{G}}^{+}$N _2的波段系统。为此，报道了新颖和准确的功能形式。为了实现我们的目标，从头开始使用高度精确的多参考配置相互作用（MRCI）方法以及与aug-cc-pVXZ（X = 5,6）相关的Davidson修改获得了电子能量。本分析表示法是通过使用最小二乘拟合程序拟合出如此精确的能量而构建的。通过考虑分析势能曲线（APEC），我们得出了分子特性，如光谱参数，振动水平和经典转折点。我们的结果与现有的实验和理论数据进行了比较。此外，我们证明，在第二正系统的实验光谱中观察到的扰动也可归因为N ₂（C“ ⁵ Π _Ù）和${\mathrm{ñ}}_2（{\mathrm{一种}}^{\prime 5}{\Sigma }_{\mathrm{G}}^{+}）$。提出了这些扰动的其他重要影响。