The electronic spectrum of the amino acid tryptophan in the gas phase
The electronic spectrum of the amino acid tryptophan in the gas phase
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气相氨基酸色氨酸的电子能谱
DOI：
10.1063/1.450323
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发表时间：
1986
影响因子：
4.4
通讯作者：
D. Levy
中科院分区：
文献类型：
--
作者：
T. Rizzo;Y. Park;L. Peteanu;D. Levy
氨基酸色氨酸的电子光谱已在冷的超音速分子束环境中测量。色氨酸的共振增强双光子电离谱显示出更易挥发的吲哚衍生物的一些特征，然而，靠近原点的谱图区域显示出更简单的含吲哚分子所不存在的独特的低频结构。光谱的功率依赖性揭示了可归因于分子束中色氨酸的几种构象异构体的特征。其中一种构象异构体显示出近似谐波的 26 cm−1 振动级数，该级数未出现在其他吲哚衍生物的光谱中，并且该级数的强度模式表明该特定构象异构体在电子激发时经历了显着的几何变化。电子光谱中缺乏许多广泛的振动级数表明色氨酸的激发态构象异构体与GR中的相似。
The electronic spectrum of the amino acid tryptophan has been measured in the environment of a cold, supersonic molecular beam. The resonantly enhanced two‐photon ionization spectrum of tryptophan shows some features characteristic of more volatile indole derivitives, however the region of the spectrum near the origin shows distinctive low frequency structure absent from the simpler indole containing molecules. The power dependence of the spectrum reveals features which can be attributed to several conformers of tryptophan in the molecular beam. One of these conformers shows a nearly harmonic 26 cm−1 vibrational progression which does not appear in the spectra of other indole derivitives, and the intensity pattern of this progression indicates that this particular conformer undergoes a significant geometry change upon electronic excitation. The lack of many extensive vibrational progressions in the electronic spectrum indicates that the excited state conformers of tryptophan are similar to those in the gr...