7.8 μm处$^{14}$N$_2$$^{16}$O的光学频率梳傅里叶变换光谱
Optical Frequency Comb Fourier Transform Spectroscopy of $^{14}$N$_2$$^{16}$O at 7.8 μm
AI总结：
本文利用中红外差频产生频率梳傅里叶变换光谱仪对$^{14}$N$_2$$^{16}$O在7.8 μm处进行宽带高分辨率测量，获取$ν$$_1$基频带和热带共184条谱线的线心频率，并将热带原点精度较HITRAN2016数据来源提升一个数量级。
摘要：
我们使用基于紧凑型中红外差频产生频率梳光源的傅里叶变换光谱仪，对一氧化二氮$^{14}$N$_2$$^{16}$O进行宽带高分辨率测量，并获取$ν$$_1$基频带和$ν$$_1$ + $ν$$_2$ - $ν$$_2$热带谱线的线心频率。光谱覆盖1285 cm$^{-1}$附近90 cm$^{-1}$的范围，采样点间距为3 ${\ imes}$ 10$^{-4}$ cm$^{-1}$（9 MHz）。我们报告了$ν$$_1$基频带中P(37)至R(38)之间72条谱线的线位置，以及$ν$$_1$ + $ν$$_2$ - $ν$$_2$热带中P(34)至R(33)之间112条谱线的线位置（该热带分裂为具有e/f无转动宇称的两个分量），不确定度在90-600 kHz范围内。我们通过将有效振转哈密顿量拟合到线心位置，推导出两个带的上能态常数。对于基频带，我们观测到所获取的线位置和上能态常数与AlSaif等人近期使用频率梳参考量子级联激光器的研究[J Quant Spectrosc Radiat Transf, 2018;211:172-178]所报道的结果具有极好的一致性。我们确定热带原点的精度比Toth基于FTIR测量的先前工作[http://mark4sun.jpl.nasa.gov/n2o.html]提高了一个数量级，该工作是HITRAN2016中这些谱带数据的来源。
英文摘要：
We use a Fourier transform spectrometer based on a compact mid-infrared difference frequency generation comb source to perform broadband high-resolution measurements of nitrous oxide, $^{14}$N$_2$$^{16}$O, and retrieve line center frequencies of the $ν$$_1$ fundamental band and the $ν$$_1$ + $ν$$_2$ - $ν$$_2$ hot band. The spectrum spans 90 cm$^{-1}$ around 1285 cm$^{-1}$ with a sample point spacing of 3 ${\times}$ 10$^{-4}$ cm$^{-1}$ (9 MHz). We report line positions of 72 lines in the $ν$$_1$ fundamental band between P(37) and R(38), and 112 lines in the $ν$$_1$ + $ν$$_2$ - $ν$$_2$ hot band (split into two components with e/f rotationless parity) between P(34) and R(33), with uncertainties in the range of 90-600 kHz. We derive upper state constants of both bands from a fit of the effective ro-vibrational Hamiltonian to the line center positions. For the fundamental band, we observe excellent agreement in the retrieved line positions and upper state constants with those reported in a recent study by AlSaif et al. using a comb-referenced quantum cascade laser [J Quant Spectrosc Radiat Transf, 2018;211:172-178]. We determine the origin of the hot band with precision one order of magnitude better than previous work based on FTIR measurements by Toth [http://mark4sun.jpl.nasa.gov/n2o.html], which is the source of the HITRAN2016 data for these bands.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
