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; 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，臭氧不足是由臭氧通过振动 - 激发氧分子与基态周围氧分子的反应引起的。为了检查这种可能性，我们绘制了高度振动的氧气分子的产量，该分子是由Hartley带中臭氧产生的。如此测量的产量已在三维大气模型计算中使用，以证明该通道作为臭氧不足的来源。另一方面，最近的量子化学计算表明，尽管尚未得出结论，但振动迅速消失 - 激发的氧分子不是化学反应，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）与平流层中的氢化物的反应中存在未开发的特征。为了解决这个问题，我们已经构建了一个具有高分辨率成像检测器的新的交叉分子束设备。开发的设备使我们能够比以前更短的时间研究兴趣的反应，即与大气问题相关的反应的加速研究。