Elucidation of Molecular Origin of Ozone Deficit

阐明臭氧缺乏的分子根源

• 批准号: 09044110
• 负责人: SUZUKI Toshinori
• 金额: $ 3.84万
• 依托单位: Okazaki National Research Institutes
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09044110/
• 关键词: Ozone deficit; Oxygen; Vibrationally - excited molecules; 光電子; フェムト秒; ピラジン; 光分解; 欠損; 成層圏

We have speculated that the ozone deficit is caused by ozone production via the reaction of vibrationally - excited oxygen molecule with surrounding oxygen molecule at the ground state . In order to examine this possibility , we mapped out the yield of highly vibrationally - excited oxygen molecules produced by photodissociation of Ozone in the Hartley band . The yield thus measured has been utilized in three dimensional atmospheric model calculation to demonstrate the possibility of this channel as the source of Ozone deficit . On the other hand , recent quantum chemical calculations show , although not yet concluded , that the rapid disappearance of vibrationally - excited oxygen molecule is not chemical reaction but to vibrational relaxation . This suggests that we need to look for other potential source of Ozone deficit more extensively . One possibility is that there exist unexplored feature in the reaction of O (1D) with hydrides in the stratosphere . In order to address this problem , we have constructed a new crossed molecular beam apparatus with high resolution imaging detector . The developed apparatus allows us to study the reaction of interest in much shorter time than before , acceleration investigation of reactions relevant to atmospheric problems .

我们推测臭氧亏损是由振动激发态的氧分子与周围处于基态的氧分子反应产生臭氧造成的。为了检验这种可能性，我们绘制出了由臭氧在哈特莱波段的光解产生的高振动激发态氧分子的产率。所测得的产率已用于三维大气模式计算，以证明该通道作为臭氧亏损源的可能性。另一方面，最近的量子化学计算表明，虽然尚未得出结论，但振动激发的氧分子的快速消失不是化学反应，而是振动弛豫。这表明，我们需要更广泛地寻找其他潜在的臭氧赤字来源。一种可能性是O（1D）与平流层中氘的反应存在未被探索的特征。为了解决这个问题，我们已经建立了一个新的交叉分子束装置与高分辨率成像探测器。所开发的装置使我们能够在比以前短得多的时间内研究感兴趣的反应，加速与大气问题有关的反应的研究。

项目成果

Yuxiang Mo and Toshinori Suzuki: ""Quantal and semiclassical analysis of vector correlation in molecular photodissociation"" Journal of Chemical Physics. 108. 6780-6789 (1998)

莫宇翔和铃木俊德：“分子光解离矢量相关性的量子和半经典分析”，《化学物理杂志》。

B.Y. Chang et al.: "Improved 2D product imaging" Rev. Sci. Inst.(in press).

经过。

T. Shibata et al.: "Detection of metastable CH_3CO radical by subpicosecond time-resolved photofragment imaging" Journal of physical chemistry. (in press.).

T. Shibata 等人：“通过亚皮秒时间分辨光片段成像检测亚稳态 CH_3CO 自由基”物理化学杂志。