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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Dye Laser Photolysis of n-Pentanal from 280 to 330 nm
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Dye Laser Photolysis of n-Pentanal from 280 to 330 nm

机译：染料激光在280至330 nm范围内对正苯二酚进行光解

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摘要

The UV photolysis of n-pentanal in the 280-330-nm region has been studied in 5-nm intervals by using dye laser photolysis in combination with cavity ring-down spectroscopy. Absorption cross sections of n-pentanal were measured at each wavelength studied. n-Pentanal exhibited a broad, structureless absorption band similar, in appearance, to that of previously studied short-chain aldehydes. The adsorption spectrum peaked at 295 nm with a cross section of (6.56 ± 0.17) * 10~(-20) cm~2 molecule~(-1). The formation of the HCO radical, which is a photodissociation product, was monitored in these experiments. The HCO yield was found to be independent of n-pentanal pressure (2-18 Torr) and total pressure (8-480 Torr) except for 325- and 330-nm photolysis where the size of the HCO signal was small and the dissociation was near the threshold. The dependence of the HCO radical yield on the photolysis wavelength was determined. The HCO yields were 0.058 ± 0.006, 0.095 ± 0.009, 0.10 ± 0.02, 0.14 ± 0.01, 0.10 ± 0.02, 0.15 ± 0.02, 0.14 ± 0.02, 0.20 ± 0.06, 0.14 ± 0.02, 0.085 ± 0.034, 0.087 ± 0.015 at 280, 285, 290, 295, 300, 305, 310, 315, 320, 325, and 330 nm, respectively, where uncertainty reflects experimental scatter only. End products from closed-cell photolysis of n-pentanal with and without O_2 were investigated at 290, 310, and 330 nm by using GC/MS and HPLC. Acetaldehyde was found to be a significant product from the photodissociation of n-pentanal/N_2 mixtures. Photolysis rates of n-pentanal to form HCO were calculated for two representative atmospheric conditions (noontime at sea level and 40°N latitude on January 1 and on July 1). The estimated radical formation rate constants from n-pentanal photolysis were about twice as fast as those obtained from acetaldehyde photolysis.
机译：通过使用染料激光光解结合腔衰荡光谱技术，以5 nm的间隔研究了280-330 nm区域中正戊醛的紫外光解。在研究的每个波长下测量正戊醛的吸收截面。正戊醛在外观上与先前研究的短链醛相似，具有宽阔的无结构吸收带。吸附光谱在295 nm处达到峰值，截面为（6.56±0.17）* 10〜（-20）cm〜2分子〜（-1）。在这些实验中监测了作为光离解产物的HCO自由基的形成。发现HCO产量与正戊醛压力（2-18 Torr）和总压力（8-480 Torr）无关，除了325和330 nm的光解作用（HCO信号的大小很小且离解为接近阈值。确定了HCO自由基产率对光解波长的依赖性。在280°C时，HCO产量为0.058±0.006、0.095±0.009、0.10±0.02、0.14±0.01、0.10±0.02、0.15±0.02、0.14±0.02、0.20±0.06、0.14±0.02、0.085±0.034、0.087±0.015分别为285、290、295、300、305、310、315、320、325和330 nm，其中不确定性仅反映实验性散射。使用GC / MS和HPLC在290、310和330 nm下研究了有和没有O_2的正戊醛的闭孔光解最终产物。发现乙醛是正戊醛/ N_2混合物的光离解的重要产物。计算了两种代表性的大气条件（1月1日和7月1日在海平面和纬度40°N的正午时间）正戊醛形成HCO的光解速率。正戊醛光解估计的自由基形成速率常数约为乙醛光解获得的自由基形成速率常数的两倍。

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