A selection of five proteinogenic amino acids—glycine, isoleucine, phenylalanine, tyrosine, and tryptophan—were studied in the mid-infrared and in the far-infrared with the purpose to facilitate the search and identification of these astrobiologically and astrochemically relevant molecules in space environments. The molar extinction coefficients (ɛ) of all mid- and far-infrared bands were determined as well as the integrated molar absorptivities (ψ). The mid-infrared spectra of the five selected amino acids were recorded also at three different temperatures from -180°C to ambient temperature to +200°C. We measured the wavelength shift of the infrared bands caused by temperature; and for the most relevant or temperature-sensitive infrared bands, a series of linear equations were determined relating wavelength position with temperature. Such equations may provide estimates of the temperature of these molecules once detected in astrophysical objects; and with the reported values of ɛ and ψ, it will be possible to estimate the relative abundance of these molecules in space environments.

中文翻译：

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甘氨酸和其他选定氨基酸的中远红外光谱的综合摩尔吸收率

在中红外和远红外中研究了五种蛋白质氨基酸——甘氨酸、异亮氨酸、苯丙氨酸、酪氨酸和色氨酸，目的是促进在太空中搜索和鉴定这些与天体生物学和天体化学相关的分子环境。确定了所有中远红外波段的摩尔消光系数 (ɛ) 以及积分摩尔吸收率 (ψ)。五种选定氨基酸的中红外光谱也在从 -180°C 到环境温度到 +200°C 的三种不同温度下进行记录。我们测量了温度引起的红外波段的波长偏移；对于最相关或温度敏感的红外波段，确定了一系列将波长位置与温度相关联的线性方程。一旦在天体物理物体中检测到这些分子，这些方程就可以提供对这些分子温度的估计；并且根据 ɛ 和 ψ 的报告值，可以估计这些分子在空间环境中的相对丰度。