空间相关冰的TeraHertz脱附发射Spectroscopy（THz DES）
TeraHertz Desorption Emission Spectroscopy (THz DES) of space relevant ices
摘要：
我们提出了一个实验仪器，进行基于实验室的气相太赫兹解吸发射光谱（THz-DES）实验，以支持天体化学。该测量系统将一个太赫兹外差辐射计与一个高真空解吸气室和高速数字采样电路相结合，该辐射计使用以前为地球观测目的开发的室温半导体混频器二极管技术，以实现具有热鉴别的分子种类的高光谱和时间分辨率光谱学。在使用过程中，分子被冷凝到液氮冷却的金属手指上，以模拟可能存在于太空中的冰结构。在沉积之后，通过加热器控制和启动热解吸，并通过温度传感器监测。释放到真空室环境中的分子的“静止频率”光谱特征由外差辐射计实时检测，并以高光谱分辨率表征。为了证明仪器的可行性，我们研究了一氧化二氮（N2 O）。这种分子在太赫兹（亚毫米波长）范围内强烈发射，并提供合适的测试气体，我们将获得的结果与更传统的技术，如四极质谱进行比较。所获得的结果使我们能够充分表征的测量方法，我们讨论了它的潜在用途作为一个实验室工具，在支持天体化学观测的分子物种在星际介质和太阳系。
英文摘要：
We present an experimental instrument that performs laboratory-based gas-phase Terahertz Desorption Emission Spectroscopy (THz-DES) experiments in support of astrochemistry. The measurement system combines a terahertz heterodyne radiometer that uses room temperature semiconductor mixer diode technology previously developed for the purposes of Earth observation, with a high-vacuum desorption gas cell and high-speed digital sampling circuitry to enable high spectral and temporal resolution spectroscopy of molecular species with thermal discrimination. During use, molecules are condensed onto a liquid nitrogen cooled metal finger to emulate ice structures that may be present in space. Following deposition, thermal desorption is controlled and initiated by means of a heater and monitored via a temperature sensor. The 'rest frequency' spectral signatures of molecules released into the vacuum cell environment are detected by the heterodyne radiometer in real-time and characterised with high spectral resolution. To demonstrate the viability of the instrument, we have studied Nitrous Oxide (N2O). This molecule strongly emits within the terahertz (sub-millimetre wavelength) range and provide a suitable test gas and we compare the results obtained with more traditional techniques such as quadrupole mass spectrometry. The results obtained allow us to fully characterize the measurement method and we discuss its potential use as a laboratory tool in support of astrochemical observations of molecular species in the interstellar medium and the Solar System.
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