The ultraviolet absorption spectrum of the à 1A‘2←X̃ 1A1 transition of jet‐cooled ammonia
The ultraviolet absorption spectrum of the à 1A‘2←X̃ 1A1 transition of jet‐cooled ammonia
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DOI：
10.1063/1.452415
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发表时间：
1987-06
影响因子：
4.4
通讯作者：
V. Vaida;M. I. Mccarthy;P. Engelking;P. Rosmus;H. Werner;P. Botschwina
中科院分区：
文献类型：
--
作者：
V. Vaida;M. I. Mccarthy;P. Engelking;P. Rosmus;H. Werner;P. Botschwina
给出了在冷分子射流中记录的 NH3 和 ND3 的 A←X 吸收光谱。出现可解析至 v'2=14 的振动带级数。不存在其他振动，无论是单独的还是组合的。记录 v2 级数的相对能带强度，并报告 A 态振动水平的均匀寿命展宽。 NH3 的所有谱带上的 FWHM 线宽为 34–293 cm−1，ND3 的 v’2=2 至 14 个谱带上的 FWHM 线宽为 30–135 cm−1。一般来说，解离速率随着振动能量非线性增加。以前仅在低于 15 K 的基质光谱中观察到的带强度交替，现在在这些非常冷的气相样品中观察到。
The A←X absorption spectra of NH3 and ND3, recorded in a cold molecular jet, are presented. Vibrational band progressions resolvable up to v’2=14 appear. No other vibrations are present, either alone or in combinations. Relative band intensities for v2 progressions are recorded, and the homogeneous lifetime broadenings of vibrational levels of the A state are reported. The FWHM linewidths span 34–293 cm−1 over all bands of NH3 and 30–135 cm−1 over the v’2=2 through 14 bands of ND3. In general, the rate of dissociation increases nonlinearly with vibrational energy. The band intensity alternation, previously observed only in matrix spectra below 15 K, has been observed in these very cold gas phase samples.