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首页> 外文期刊>Journal of Photochemistry and Photobiology, A. Chemistry >The temperature and pressure dependence of the absorption cross-sections of NO_2 in the 250-800 nm region measured by Fourier-transform spectroscopy
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The temperature and pressure dependence of the absorption cross-sections of NO_2 in the 250-800 nm region measured by Fourier-transform spectroscopy

机译：傅里叶变换光谱法测量250-800 nm区域NO_2吸收截面的温度和压力依赖性

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摘要

The absorption cross-sections of NO_2 at atmospheric temperatures (223-293 K) and pressures (100 and 1000 mbar) were measured in the 250-800nm (12500-40000 cm~(-1)) region using Fourier-transform spectroscopy, at spectral resolutions of 0.5 cm~(-1) above 435 nm and 1.0 cm~(-1) below 435 nm (corresponding to about 8 and 16 pm at this wavelength). The wavenumber accuracy of the new cross-sections is better than 0.1 cm~(-1) (about 0.5 pm at 250 nm and about 6.4 pm at 800 nm), validated by recording of I_2 absorption spectra in the visible using the same experimental set-up (light source, beam splitter, interferometer optics). The NO_2 absorption spectra were recorded at five different sample temperatures between 223 and 293 K, and at each temperature at two total pressures (100 and 1000 mbar) using pure N_2 as buffer gas. Despite the weakness of this effect compared to the density of the NO_2 absorption structures, pressure-broadening was clearly observed at all temperatures. The pressure-broadening was partially modeled using a convolution of the low-pressure NO_2 absorption spectra with a Lorentzian lineshape. The pressure-broadening coefficient increases significantly with decreasing temperature, as already observed in the mid- and near-infrared vibration-rotation spectra of NO_2. This effect is of importance for high-resolution spectroscopy of the earth's atmosphere in the UV-visible region.
机译：使用傅立叶变换光谱法在250-800nm（12500-40000 cm〜（-1））区域内测量大气温度（223-293 K）和压力（100和1000 mbar）下NO_2的吸收截面，在435 nm以上0.5 cm〜（-1）和在435 nm以下1.0 cm〜（-1）的光谱分辨率（对应于该波长下的大约8和16 pm）。新横截面的波数精度优于0.1 cm〜（-1）（250 nm处约0.5 pm，800 nm处约6.4 pm），通过使用相同实验装置记录可见光中的I_2吸收光谱来验证-向上（光源，分束器，干涉仪光学器件）。使用纯N_2作为缓冲气体，分别在223和293 K之间的五个不同样品温度下以及在两个总压力（100和1000 mbar）下的每个温度下记录NO_2吸收光谱。尽管与NO_2吸收结构的密度相比，该效果较弱，但在所有温度下均清楚地观察到压力增大。使用具有洛伦兹线形的低压NO_2吸收光谱的卷积来部分模拟压力扩展。如在NO_2的中红外和近红外振动-旋转光谱中已经观察到的那样，压力增大系数随温度的降低而显着增加。该效果对于紫外线可见区域中地球大气的高分辨率光谱非常重要。

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