基于光学频率梳傅里叶变换光谱的1250至1380 cm⁻¹范围内亚兆赫精度的甲烷谱线列表
A methane line list with sub-MHz accuracy in the 1250 to 1380 cm-1 range from optical frequency comb Fourier transform spectroscopy
AI总结：
利用光学频率梳傅里叶变换光谱仪测量甲烷1250–1380 cm⁻¹光谱，反演678条谱线位置与强度，将位置不确定度降至亚兆赫级并显著改善全局模型拟合残差。
摘要：
我们使用基于差频产生光学频率梳的傅里叶变换光谱仪，测量了1250–1380 cm⁻¹范围内甲烷的高分辨率、低压、室温光谱。从这些光谱中，我们反演了两个同位素体的678条谱线的位置和强度：来自¹²CH₄ ν₄基频带的157条谱线，来自¹³CH₄ ν₄基频带的131条谱线，以及来自两个¹²CH₄热带ν₂ + ν₄ - ν₂和2ν₄ - ν₄的390条谱线。对于另外165条来自¹²CH₄ ν₄基频带的谱线，我们仅反演了谱线位置。谱线位置的不确定度范围为0.19至2.3 MHz，与先前由传统FTIR吸收测量获得的¹²CH₄基频带和热带数据相比，其中值分别降低了18倍和59倍。新的谱线位置被纳入两种甲烷同位素体光谱的全局模型中，拟合残差相比先前的吸收数据降低了8倍，相比发射数据降低了20倍。实验谱线强度的相对不确定度在1.5–7.7%范围内，与先前可用数据相当；235条新的¹²CH₄谱线强度被纳入全局模型。
英文摘要：
We use a Fourier transform spectrometer based on a difference frequency generation optical frequency comb to measure high-resolution, low-pressure, room-temperature spectra of methane in the 1250 - 1380 cm$^{-1}$ range. From these spectra, we retrieve line positions and intensities of 678 lines of two isotopologues: 157 lines from the $^{12}$CH${_4}$ $ν$${_4}$ fundamental band, 131 lines from the $^{13}$CH${_4}$ $ν$${_4}$ fundamental band, as well as 390 lines from two $^{12}$CH${_4}$ hot bands, $ν$${_2}$ + $ν$${_4}$ - $ν$${_2}$ and 2$ν$${_4}$ - $ν$${_4}$. For another 165 lines from the $^{12}$CH${_4}$ $ν$${_4}$ fundamental band we retrieve line positions only. The uncertainties of the line positions range from 0.19 to 2.3 MHz, and their median value is reduced by a factor of 18 and 59 compared to the previously available data for the $^{12}$CH${_4}$ fundamental and hot bands, respectively, obtained from conventional FTIR absorption measurements. The new line positions are included in the global models of the spectrum of both methane isotopologues, and the fit residuals are reduced by a factor of 8 compared to previous absorption data, and 20 compared to emission data. The experimental line intensities have relative uncertainties in the range of 1.5 - 7.7%, similar to those in the previously available data; 235 new $^{12}$CH${_4}$ line intensities are included in the global model.
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