Integrated Near-Infrared Band Strengths of Solid CH4 and Its Mixtures with N2
Integrated Near-Infrared Band Strengths of Solid CH4 and Its Mixtures with N2
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DOI：
10.1086/591509
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发表时间：
2008-10
期刊：
影响因子：
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通讯作者：
R. Brunetto;G. Caniglia;G. Baratta;M. Palumbo
中科院分区：
文献类型：
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作者：
R. Brunetto;G. Caniglia;G. Baratta;M. Palumbo
我们用近红外透射光谱（1.0-3.6 μm）研究了冰冷的CH_4及其与N_2的混合物（温度16-40 K），并用两束激光的干涉图样监测薄膜的生长。我们测量了甲烷谱带的峰位、半峰宽、强度以及冰膜的密度和真实的折射率。结果证实和扩展，但也部分矛盾以前的研究类似的混合物。实验数据可用于解释太阳系（外海王星天体）和星际冰的观测，据信其中存在甲烷和氮。我们预测的光学深度的两个甲烷近红外波段的视线中的一些密集的分子云。
We studied icy CH4 and its mixtures with N2 (temperature 16-40 K), using near-IR transmittance spectroscopy (1.0-3.6 μm), and monitoring the film growth using interference patterns of two lasers. We measured peak position, full width at half-maximum, and strengths of the methane bands, and density and real refractive index of the icy films. Results confirm and extend but also partially contradict previous studies on similar mixtures. Experimental data can be applied to interpret observations of solar system (trans-Neptunian objects) and interstellar ices, where methane and nitrogen are believed to be present. We predict the optical depths of two methane NIR bands in the line of sight of some dense molecular clouds.