We measured temperature-dependent cross-sections of n-butane (CH₃CH₂CH₂CH₃) in the mid-infrared (7–15 μm) region in support of remote sensing for the Titan's atmosphere. For this, 28 pure and N₂-mixture spectra were obtained at 180–298 K using a high-resolution Fourier transform spectrometer (Bruker IFS 125 HR) at the Jet Propulsion Laboratory. The spectral resolutions were selected to be between 0.0039 and 0.06 cm⁻¹, depending on the sample pressures. The observed spectra were fit simultaneously to generate one single set of pseudolines, which include line intensities and lower state energies at individual pseudoline positions. The observed spectra could be reproduced by the pseudolines to within 4% through line-by-line radiative transfer calculations. The integrated intensities at 296 K were measured to be 5.06(28), 7.18(27), 0.91(4), and 49.01(20) × 10⁻¹⁹ cm⁻¹/(molecule.cm⁻²) in the 660–860, 860–1060, 1060–1200, and 1200–1538 cm⁻¹ regions, respectively, by summing up the pseudoline intensity parameters. These results are observed to be significantly lower than that of the PNNL (Pacific Northwest National Laboratory) cross-sections obtained at low resolution. The pseudolines are electronically compiled in the HITRAN database format, which can be readily integrated with existing radiative transfer calculations. The measured cross-sections represented by the pseudolines could provide critical laboratory input in search of elusive species that might be captured in the Cassini/CIRS and the JWST/MIRI spectral observations.

我们测量了中红外（7–15μm）区域中正丁烷（CH ₃ CH ₂ CH ₂ CH ₃）的温度相关截面，以支持对泰坦大气的遥感。为此，使用喷射推进实验室的高分辨率傅里叶变换光谱仪（布鲁克IFS 125 HR）在180–298 K上获得了28个纯谱和N ₂混合物谱。光谱分辨率选择在0.0039和0.06 cm ^-1之间，取决于样品压力。同时拟合观察到的光谱，以生成一组伪线，其中包括伪线位置处的线强度和较低态能量。通过逐行辐射传输计算，伪谱线可以将观察到的光谱复制到4％以内。在660–860中，在296 K处的积分强度经测量为5.06（28），7.18（27），0.91（4）和49.01（20）×10 ^-19  cm ^-1 /(mol.cm ^-2）。 ，860–1060、1060–1200和1200–1538 cm ^-1通过对伪线强度参数求和，分别得出区域。观察到这些结果明显低于以低分辨率获得的PNNL（太平洋西北国家实验室）截面的结果。伪线以HITRAN数据库格式电子编译，可以很容易地与现有的辐射传输计算集成在一起。用伪线表示的测量横截面可以提供关键的实验室输入，以搜索可能在卡西尼/ CIRS和JWST / MIRI光谱观测中捕获的难以捉摸的物种。