Laboratory Study of Collisions of Vibrationally Excited OH with O2 and O

振动激发 OH 与 O2 和 O 碰撞的实验室研究

• 批准号: 9909807
• 负责人: Richard Copeland
• 金额: $ 30.31万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-02-15 至 2003-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909807&HistoricalAwards=false
• 关键词: Laboratory; Study; Collisions; Vibrationally; Excited

This proposal addresses three needs of the Aeronomy community and the TIMED program. i) Determine the removal rates for the OH (u = 7, 8, and 9) levels by O2 at mesospheric temperatures to the required accuracy of15%. ii)Measure the removal rate of various levels of vibrationally excited OH by O atoms to the required accuracy of 50%. iii) Study the pathways of energy disposition from the collisional removal of vibrational energy from the OH(u = 7, 8, and 9) levels. Currently, the collisional removal rates of the OH (u= 7, 8, and 9) levels by O2 are only known, through the PI's previous measurements at room temperature, to an accuracy of 29%, 13% and 65%, respectively. These measurements also showed that the rate for OH (u = 10) removal by 02 increased by 37% as the temperature was reduced from 310 K to 223 K. There are no measurements or calculations of the collisional removal rates for vibrational levels of OH by O atoms. Finally, the mechanisms for vibrational energy removal have only been deduced form modeling studies, with uncertain results. Thus, the proposed laboratory measurements are needed if the SABER experiment of the TIMED program is to meet its accuracy goals and to understand the intensity of OH emission in the atmosphere

该提案解决了Aeronomy社区和TIMED计划的三个需求。i）在中间层温度下测定O2对OH（u = 7、8和9）水平的去除率，达到要求的15%的精度。 ii）测量O原子对各种水平的振动激发OH的去除率，达到所需的50%的精度。 iii）研究从OH（u = 7、8和9）能级碰撞去除振动能的能量配置途径。 目前，通过PI先前在室温下的测量，仅知道O2对OH（u= 7、8和9）能级的碰撞去除率，分别精确到29%、13%和65%。 这些测量还表明，随着温度从310 K降低到223 K，O2去除OH（u = 10）的速率增加了37%。 没有测量或计算的碰撞去除率的振动水平的OH的O原子。 最后，振动能量去除的机制仅从建模研究中推导出来，结果不确定。 因此，如果TIMED计划的SABER实验要满足其精度目标并了解大气中OH排放的强度，则需要拟议的实验室测量