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Infrared Studies At The Ice Laboratory Of Alcoy

机译：酒精冰实验室的红外研究

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At present, there are few laboratory spectra of analogs of astrophysical interest in the far-infrared range (FIR). Laboratory infrared (IR) spectra of simple ices and its mixtures obtained at low temperature and pressure are found mainly up to 25 μm, and few up to 200 μm. On the other hand, there are some spectra for carbonaceous material and silicates up to 2000 μm. Our laboratory is equipped with an IR spectrometer that integrates a Michelson interferometer with a resolution better than 0.25 cm~(-1) and that operates under vacuum conditions of 10~(-1) mbar. There is also a silicon bolometer, a very high-sensitivity detector in comparison with the standard deuterated triglycine sulfate (DTGS) detectors. The use of the bolometer and the possibility of working under vacuum conditions inside the optics and the sample compartment of the spectrometer allow obtaining high-sensitivity spectra free from H_2O vapor and CO_2 gas bands. Those conditions are necessary to obtain high-quality spectra in the FIR where absorption bands are much less intense than those in the mid-IR region. In our laboratory there is also a high-vacuum chamber that allows different studies on ices deposited onto a cold finger. We have already carried out experiments on the study of ice density as a function of temperature, UV irradiation of ices, temperature-programmed desorption (TPD) and UV-vis reflectance. In this work, we present the design of the experimental setup we are building to carry out different experiments simultaneously on the same ice sample, including spectra measurements in the mid-IR range (MIR) and the FIR. This design integrates jointly the IR spectrometer, the high-vacuum chamber and the silicon bolometer. Lastly, we show a spectrum we have obtained of a solid of astrophysical interest such as crystalline forsterite grains by using the polyethylene pellet technique.
机译：目前，在远红外范围（FIR）中天体物理类似物的实验室光谱很少。发现在低温和低压下获得的简单冰及其混合物的实验室红外（IR）光谱主要达到25μm，很少达到200μm。另一方面，碳质材料和硅酸盐的某些光谱可达200​​0μm。我们的实验室配备了红外光谱仪，该光谱仪集成了分辨率高于0.25 cm〜（-1）的迈克尔逊干涉仪，并在10〜（-1）mbar的真空条件下运行。与标准的氘代硫酸三甘氨酸（DTGS）检测器相比，还有一个硅辐射热计，它是一种非常高灵敏度的检测器。辐射热计的使用以及在光学器件和光谱仪的样品室内部在真空条件下工作的可能性允许获得不含H_2O蒸气和CO_2气带的高灵敏度光谱。这些条件对于在FIR中获得高质量光谱是必不可少的，在FIR中，吸收带的强度远低于中IR区域的吸收带。在我们的实验室中，还有一个高真空腔室，可以对沉积在冷手指上的冰进行不同的研究。我们已经进行了关于冰密度随温度变化，冰的紫外线照射，程序升温解吸（TPD）和紫外线可见反射率的研究。在这项工作中，我们介绍了我们正在建立的实验装置的设计，以对同一冰样品同时进行不同的实验，包括中红外范围（MIR）和FIR的光谱测量。该设计将红外光谱仪，高真空室和硅辐射热计集成在一起。最后，我们显示了通过使用聚乙烯颗粒技术获得的天体物质固体（如镁橄榄石晶体）的光谱。

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