Calibration of vacuum-ultraviolet monochromators by the molecular branching-ratio technique
Calibration of vacuum-ultraviolet monochromators by the molecular branching-ratio technique
复制标题
分子支化比技术校准真空紫外单色仪
DOI：
10.1364/josa.61.000083
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发表时间：
1971
影响因子：
--
通讯作者：
E. C. ZlPF
中科院分区：
文献类型：
--
作者：
M. Mumma;E. C. ZlPF
N2的Lylman-Birge-Hopfield系统（a1 g-X1 g+）和CO的第四正系统（A1 g-X1+）容易被低能电子（100 eV）激发。总之，这些分子系统具有在波长区域1150-2500 A上均匀分布的许多发射带。由于这两个系统的绝对跃迁几率都已被精确测量，因此电子碰撞激发的这些谱带强度的相对测量可以作为一种方便的技术用于校准真空紫外（vuv）单色仪。这是本文所描述的分子支化比技术的基础。通过将谱带强度与氢Ly-α线（1215 A）和分别由H2和O2的解离激发产生的Oi共振三重态（1302，4，6 A）的强度进行比较，这些相对测量可以置于绝对基础上，并与波长大于1500 A的标准灯进行比较。通过这种方法获得的结果被证明是在良好的协议与相对光谱响应测量通过使用原子分支比技术。
The Lylman–Birge–Hopfield system of N2(a1Πg–X1Σg+) and the CO fourth-positive system (A1Π–X1Σ+) are readily excited by low-energy electrons (100 eV). Together, these molecular systems have numerous emission bands spread uniformly over the wavelength region 1150–2500 A. Because the absolute transition probabilities for both these systems have been accurately measured, relative measurement of the intensities of these bands excited by electron impact can be used as a convenient technique for calibrating vacuum-ultraviolet (vuv) monochromators. This is the basis of the molecular branching-ratio technique described in this paper. These relative measurements can be placed on an absolute basis by comparing the band intensities to the intensity of the hydrogen Ly-α line (1215 A) and the O i resonance triplet (1302, 4, 6 A) produced by the dissociative excitation of H2 and O2, respectively, and to a standard lamp at wavelengths greater than 1500 A. The results obtained by this method are shown to be in excellent agreement with relative spectral-response measurements obtained by use of the atomic branching-ratio technique.