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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Temperature and Pressure Dependence of High-Resolution Air-Broadened Absorption Cross Sections of NO_2 (415-525 nm)
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Temperature and Pressure Dependence of High-Resolution Air-Broadened Absorption Cross Sections of NO_2 (415-525 nm)

机译：NO_2（415-525 nm）的高分辨率空气膨胀吸收截面的温度和压力依赖性

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摘要

Cross sections of air-broadened NO_2 in the 415-525 nm region are reported. These are retrieved from 21 absorption spectra recorded at 0.060 cm~(-1) resolution with the McMath-Pierce Fourier Transform Spectrometer located on Kitt Peak in Arizona. The measurements are obtained for pressures (1-760 Torr) and temperatures (220-298 K) that are representative of typical tropospheric and stratospheric conditions. Two sigma uncertainty (95% confidence interval 2mean) for the absolute absorption cross sections is below ±7% over the reported wavelength range. The average integrated intensity of all our data is <σ>_(400-500 nm) = 4.53 × 10~(-17) cm~2 nm, which is within 0.2% of the averaged value from the recent literature. The wavelength (referred to vacuum) accuracy is 0.011 cm~(-1) (2.8 × 10~(-4) nm at 500 nm) and precision is 0.0022 cm~(-1) throughout the investigated wavelength range. In agreement with previous observations, high-resolution features in the NO2 absorption spectrum display a strong pressure dependence with an effective pressure broadening parameter of 0.116 ± 0.003 cm~(-1)/atm (the rate of increase of Lorentzian half width at half-maximum with pressure). Temperature has a relatively minor effect on the shapes of individual high-resolution features, but it exerts a complex dependence on the relative line intensities. Absorption cross sections reported here represent the highest resolution data available over a substantial (>100 nm) wavelength range for quantitative analysis of NO2 atmospheric column absorption spectra.
机译：报告了在415-525 nm区域中空气膨胀的NO_2的横截面。使用位于亚利桑那州基特峰的McMath-Pierce傅立叶变换光谱仪从以0.060 cm〜（-1）分辨率记录的21个吸收光谱中检索这些。获得的压力（1-760托）和温度（220-298 K）代表典型的对流层和平流层条件。在报告的波长范围内，绝对吸收截面的两个西格玛不确定度（95％置信区间2mean）低于±7％。我们所有数据的平均积分强度为<σ> _（400-500 nm）= 4.53×10〜（-17）cm〜2 nm，在最近文献平均值的0.2％范围内。在整个研究的波长范围内，波长（称为真空）精度为0.011 cm〜（-1）（500 nm时为2.8×10〜（-4）nm），精度为0.0022 cm〜（-1）。与以前的观察结果一致，NO2吸收光谱中的高分辨率特征显示出强烈的压力依赖性，有效压力展宽参数为0.116±0.003 cm〜（-1）/ atm（洛伦兹半宽度在半最高压力）。温度对单个高分辨率特征的形状影响相对较小，但它对相对线强度具有复杂的依赖性。此处报告的吸收截面表示可在相当大的波长范围（> 100 nm）内获得的最高分辨率数据，用于NO2大气柱吸收光谱的定量分析。

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