Study of the quantum-yields of the products in the photolysis of ozone

紫外区臭氧光解0（1D）产生的量子产率作为波长和温度的函数是大气化学建模计算的关键输入。在230 ~ 308 nm的Hartley波段，臭氧分子在其强光吸收带中被光分解，并在130 nm左右用激光诱导荧光技术直接检测到0（3Pj）光碎片。在297±2 K下，臭氧光解形成0（1D）的量子产率值作为光解波长的函数，以308 nm处0（1D）的绝对量子产率值0.79作为参考。得到的0（1D）量子产额值几乎与Hartley波段上的波长无关（~ 0.91）。结果与以前用各种实验技术测得的值进行了比较。结果还与用于大气模拟的推荐值进行了比较。计算了平流层中03光解生成0（1D）的相对产率。我们已经证明，在15、25和40 km高度上，用本研究获得的0（1D）量子产率值计算的0（1D）产率比用最新NASA/JPL推荐值计算的0（1D）产率分别小1.9%、3.5%和4.8%。另一方面，用我们的0（1D）量子产率数据计算的0（1D）产率在15和25 km时分别比IUPAC推荐值小4.0%和5.7%，在40 km时则大0.2%。

The quantum yield for 0(1D) production in the photolysis of ozone in the ultraviolet region as a function of wavelength and temperature is a key input for modeling calculations in the atmospheric chemistry. Ozone molecules have been photolysed in its strong photoabsorption band of the Hartley band at 230 - 308 nm and the 0(3Pj) photo fragments have been detected directly by a technique of laser-induced fluorescence around 130 nm. The quantum yield values for 0(1D) formation in the photolysis of ozone at 297 ± 2 K have been determined as a function of the photolysis wavelength, using the absolute 0(1D) quantum yield value of 0.79 at 308 nm as a reference. The 0(1D) quantum yield values obtained are found to be almost independent of the wavelength over the Hartley band (〜0.91). The results are compared with the values measured previously with various experimental techniques. The results are also compared with the recommendation values for use in atmospheric modeling. The relative production rates of 0(1D) from 03 photolysis in the stratosphere have been evaluated. We have shown that the 0(1D) production rates calculated with the 0(1D) quantum yield values obtained in this study are smaller than those calculated with the latest NASA/JPL recommendation by 1.9, 3.5 and 4.8 % , at the altitudes of 15, 25 and 40 km, respectively. On the other hand, the the 0(1D) production rates calculated with our 0(1D) quantum yield data are smaller than those with the IUPAC recommendation by 4.0 and 5.7 % at 15 and 25 km, respectively, and larger by 0.2 % at 40 km.