Difluoromethane (CH₂F₂; HFC-32), a hydrofluorocarbon (HFC) used as a refrigerant in air conditioning and heat pump systems, is currently being phased out under the terms of the Montreal Protocol (Kigali Amendment). In order to monitor its concentration profiles using infrared-sounding instruments, for example the Atmospheric Chemistry Experiment – Fourier transform spectrometer (ACE-FTS), accurate laboratory spectroscopic data are required. This work describes new high-resolution infrared absorption cross sections of difluoromethane / dry synthetic air over the spectral range 850–1335 cm⁻¹, derived from spectra recorded using a high-resolution Fourier transform spectrometer (Bruker IFS 125HR) and a 26-cm-pathlength cell. Spectra were recorded at resolutions between 0.009 and 0.03 cm⁻¹ (calculated as 0.9/MOPD; MOPD = maximum optical path difference) over a range of temperatures and pressures (7.6–760 Torr and 188–297 K). The new absorption cross sections in this work improve upon those currently available in HITRAN for remote sensing.

根据《蒙特利尔议定书》（《基加利修正案》）的规定，目前正在逐步淘汰用作空调和热泵系统中制冷剂的氢氟碳化物（HFC）二氟甲烷（CH ₂ F ₂； HFC-32）。为了使用红外探测仪器（例如，大气化学实验–傅立叶变换光谱仪（ACE-FTS））监测其浓度分布，需要准确的实验室光谱数据。这项工作描述了光谱范围为850–1335 cm ^-1的二氟甲烷/干燥的合成空气的高分辨率高分辨率红外吸收截面，来自使用高分辨率傅里叶变换光谱仪（Bruker IFS 125HR）和26厘米光程单元记录的光谱。在一定温度和压力范围（7.6–760 Torr和188–297 K）上，以在0.009和0.03 cm ^-1之间的分辨率（计算为0.9 / MOPD； MOPD =最大光程差）记录光谱。这项工作中新的吸收截面比HITRAN中当前可用于遥感的截面有所改善。