Collision-induced absorption (CIA) spectra of nitrogen and methane are needed to model radiative transfer in atmospheres of objects such as Saturn's moon, Titan. We present rare, extremely low temperature Fourier transform infrared spectra of nitrogen and methane rototranslation CIA in the range of 40–600 cm−1. The peak CIA of methane was found to be 2.05×10−5 cm−1/amagat2 at 123.8 K while nitrogen had a peak value of 1.65×10−5 cm−1/amagat2 at an average temperature of 102.5 K. These measurements were made possible by the unique instrumentation available at the Far-IR beamline at the Canadian Light Source.

中文翻译：

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N2 和 CH4 的碰撞诱导吸收光谱


需要氮和甲烷的碰撞诱导吸收 (CIA) 光谱来模拟土星卫星泰坦等天体大气中的辐射传输。我们展示了 40–600 cm−1 范围内的氮气和甲烷旋转平移 CIA 的罕见、极低温傅里叶变换红外光谱。甲烷的 CIA 峰值在 123.8 K 时为 2.05×10−5 cm−1/amagat2，而氮气在平均温度为 102.5 K 时的峰值为 1.65×10−5 cm−1/amagat2。这些测量结果是加拿大光源远红外光束线的独特仪器使之成为可能。