一种用于近红外高精度多普勒测量的新型气室
A New Gas Cell for High-Precision Doppler Measurements in the Near-Infrared
摘要：
近红外高分辨率光谱学可能成为发现极低质量恒星和褐矮星周围太阳系外行星的主要方法。为了帮助实现~m/s的精度，我们正在开发一种气体池，它由吸收谱线跨越整个近红外区域的气体混合物组成。我们提出了最有前途的混合物，由乙炔，一氧化二氮，氨，氯甲烷和碳氢化合物。该混合物包含在一个小尺寸的13厘米长的气体电池，并涵盖了大部分的H和K波段。它还显示了J波段中的小反射，但它们很少并且对于近红外波长校准不够尖锐。我们描述的工作方法和实验，并比较我们的结果与最先进的近红外气体电池。
英文摘要：
High-resolution spectroscopy in the near-infrared could become the leading method for discovering extra-solar planets around very low-mass stars and brown dwarfs. To help to achieve an accuracy of ~m/s, we are developing a gas cell which consists of a mixture of gases whose absorption spectral lines span all over the near-infrared region. We present the most promising mixture, made of acetylene, nitrous oxide, ammonia, chloromethans and hydrocarbons. The mixture is contained in a small size 13 cm long gas cell and covers most of the H and K-bands. It also shows small absorptions in the J-band but they are few and not sharp enough for near infrared wavelength calibration. We describe the working method and experiments and compare our results with the state of the art for near infrared gas cells.
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