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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Near-ultraviolet absorption cross sections of nitrophenols and their potential influence on tropospheric oxidation capacity
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Near-ultraviolet absorption cross sections of nitrophenols and their potential influence on tropospheric oxidation capacity

机译：硝基酚的近紫外吸收截面及其对对流层氧化能力的潜在影响

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摘要

Nitrophenols and methylnitrophenols have been identified as photolytic precursors of nitrous acid, HONO, but their gas-phase absorption has not previously been reported. In this study, the absorption cross sections of 2-nitrophenol, 3-methyl-2-nitrophenol, and 4-methyl-2-nitrophenol were measured from 320 to 450 nm using incoherent broad-band cavity-enhanced absorption spectroscopy (IBBCEAS). The benzaldehyde absorption spectrum was measured to validate the approach and was in good agreement with literature spectra. The nitrophenol absorption cross sections are large (ca. 10~(-17) cm ~2 molecule~(-1)) and blue-shifted about 20 nm compared to previously measured solution spectra. Besides forming HONO, nitrophenol absorption influences other photochemistry by reducing the available actinic flux. The magnitudes of both effects are evaluated as a function of solar zenith angle, and nitrophenol absorption is shown to lower the photolysis rates of O_3 and NO_2.
机译：硝基苯酚和甲基硝基苯酚已被确定为亚硝酸HONO的光解前体，但以前尚未报道它们的气相吸收。在这项研究中，使用非相干宽带腔增强吸收光谱（IBBCEAS）在320至450 nm范围内测量了2-硝基苯酚，3-甲基-2-硝基苯酚和4-甲基-2-硝基苯酚的吸收截面。测量了苯甲醛的吸收光谱以验证该方法，并且与文献光谱非常吻合。与以前测得的溶液光谱相比，硝基苯酚的吸收截面大（约10〜（-17）cm〜2分子〜（-1）），蓝移约20 nm。除形成HONO外，硝基苯酚的吸收还通过减少可用的光化通量来影响其他光化学。根据太阳天顶角评估这两种作用的强度，并显示硝基苯酚吸收会降低O_3和NO_2的光解速率。

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