Institute for Lasers, Life and Biophotonics, VU University, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.
J Chem Phys. 2012 Jun 21;136(23):234310. doi: 10.1063/1.4726457.
An extensive survey of the D(2) absorption spectrum has been performed with the high-resolution VUV Fourier-transform spectrometer employing synchrotron radiation. The frequency range of 90,000-119,000 cm(-1) covers the full depth of the potential wells of the B (1)Σ(u)(+), B' (1)Σ(u)(+), and C (1)Π(u) electronic states up to the D(1s) + D(2l) dissociation limit. Improved level energies of rovibrational levels have been determined up to respectively v = 51, v = 13, and v = 20. Highest resolution is achieved by probing absorption in a molecular gas jet with slit geometry, as well as in a liquid helium cooled static gas cell, resulting in line widths of ≈0.35 cm(-1). Extended calibration methods are employed to extract line positions of D(2) lines at absolute accuracies of 0.03 cm(-1). The D (1)Π(u) and B'' (1)Σ(u)(+) electronic states correlate with the D(1s) + D(3l]) dissociation limit, but support a few vibrational levels below the second dissociation limit, respectively, v = 0-3 and v = 0-1, and are also included in the presented study. The complete set of resulting level energies is the most comprehensive and accurate data set for D(2). The observations are compared with previous studies, both experimental and theoretical.
采用同步辐射的高分辨率真空紫外傅里叶变换光谱仪对 D(2) 吸收光谱进行了广泛的研究。频率范围为 90000-119000cm(-1)，涵盖了 B(1)Σ(u)(+)、B' (1)Σ(u)(+) 和 C(1)Π(u) 电子态的全部势能阱深度，直至 D(1s)+D(2l) 离解极限。已确定的振转能级的能级能量高达 v = 51、v = 13 和 v = 20。通过探测分子气体射流和液氦冷却静态气体池中的吸收，实现了最高分辨率，谱线宽度约为 0.35cm(-1)。采用扩展的校准方法，可以以 0.03cm(-1)的绝对精度提取 D(2)线的线位置。D(1)Π(u)和 B''(1)Σ(u)(+)电子态与 D(1s)+D(3l])离解极限相关联，但分别支持低于第二离解极限的几个振动能级，即 v = 0-3 和 v = 0-1，并且也包含在本研究中。所得能级能量的完整集合是 D(2)最全面和最准确的数据集合。这些观察结果与之前的实验和理论研究进行了比较。
