Scirè C, Urso R G, Fulvio D, Baratta G A, Palumbo M E
INAF - Osservatorio Astrofisico di Catania, via Santa Sofia 78, I-95123 Catania, Italy.
INAF - Osservatorio Astrofisico di Catania, via Santa Sofia 78, I-95123 Catania, Italy; Institut d'Astrophysique Spatiale, CNRS/Université Paris-Sud, Université Paris-Saclay, batiment 121, Université Paris-Sud, 91405 Orsay Cedex, France.
Spectrochim Acta A Mol Biomol Spectrosc. 2019 Aug 5;219:288-296. doi: 10.1016/j.saa.2019.04.021. Epub 2019 Apr 18.
We present a novel experimental study on solid CHDOH pure and in astrophysical relevant mixtures. Solid samples were accreted under ultra high vacuum conditions at 17 K and were analyzed by mid-infrared transmission spectroscopy. Refractive index, density, and mid-IR band strength values were measured for pure solid CHDOH. The refractive index was also measured for CHDOH:HO, CHDOH:CO, and CHDOH:CHOH mixtures. For all samples, the thermal evolution of the main band profile was studied. We used the interference laser technique (HeNe laser, λ = 543.5 nm) to measure the samples thickness and a numerical method to measure the refractive index starting from the amplitude of the interference curve. We obtained the ice density through the Lorentz-Lorenz relation. To calculate the band strength values we used the linear fit of the integrated band intensities with respect to the column densities. Samples deposited at 17 K were warmed up to their sublimation temperature. Spectra were taken at selected temperatures to study their thermal evolution. The results are discussed in view of their relevance for the interpretation of astronomical IR spectra.
我们展示了一项关于固态CHDOH纯物质及其与天体物理学相关混合物的新颖实验研究。固态样品在17K的超高真空条件下积聚，并通过中红外透射光谱进行分析。测量了纯固态CHDOH的折射率、密度和中红外波段强度值。还测量了CHDOH:HO、CHDOH:CO和CHDOH:CHOH混合物的折射率。对于所有样品，研究了主波段轮廓的热演化。我们使用干涉激光技术（氦氖激光，λ = 543.5nm）测量样品厚度，并使用数值方法从干涉曲线的振幅开始测量折射率。我们通过洛伦兹 - 洛伦茨关系获得冰密度。为了计算波段强度值，我们使用了积分波段强度相对于柱密度的线性拟合。在17K沉积的样品被加热到它们的升华温度。在选定温度下采集光谱以研究它们的热演化。鉴于其对天文红外光谱解释的相关性，对结果进行了讨论。
