Vibrationally State Specific Relaxation Measurements for Highly Vibrationally Excited Oxygen: Are Quantum States Important in the Atmosphere?

高振动激发氧的振动态特定弛豫测量：量子态在大气中重要吗？

• 批准号: 9300074
• 负责人: Alec Wodtke
• 金额: $ 21.44万
• 依托单位: University of California-Santa Barbara
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-08-15 至 1996-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9300074&HistoricalAwards=false
• 关键词: Vibrationally; State; Specific; Relaxation; Measurements

WPC 2 B V J Z Courier T ? x x x x 6 X @ K X @ Apple LaserWriter IINT APLASIIN.PRS x @ h h h h tX @ #| x 2 Abstract for ATM-9300074 The stimulated emission pumping (SEP)technique has enabled the study of highly vibrationally excited molecules. Such investigations are important because there is now considerable evidence for an efficient production mechanism for highly vibrationally excited oxygen molecules in the stratosphere and mesosphere. Recent measurements have documented that ozone photolysis can produce excited O2 in states as high as v"26. It has been suggested that these excited oxygen molecules can significantly influence the ozone budget in the upper atmosphere. For example, the stratospheric ozone concentration would be increased by 10% if only 10-4 of the total ozone photolysis leads to excited O2(v"26). Thus, mechanisms involving vibrationally excited oxygen molecules may be the missing source of ozone that is required in order to explain the inability of the atmospheric models to reproduce the actual vertical profile of stratospheric ozone. This research will investigate if the following mechanism provides an important source of stratospheric ozone: (1) O3 + hv (238 nm) O2(v"26) + O(3P) (2) O2(v"26) + O2 O3 + O (3) O + O2 + M O3 + M NET O3 + O2 O3 + O The reaction rates for step 2 in the preceding mechanism will be determined during this study with the cavity ring down absorption spectroscopic method. Temperature dependence measurements will also be performed. In addition, a direct measurement of the vibrational distribution from ozone photodissociation at 226 nm will be attempted for comparison with recent results reported by other workers. If these O2 photolysis products are vibrationally excited, then this will establish the atmospheric source of highly vibrationally excited O2 and its role in the ozone budget of the upper atmosphere.

wpc2 B V J Z Courier T ？x x x x 6 @ K X @ 苹果LaserWriter IINT APLASIIN。受激发射泵浦（SEP）技术使高振动激发分子的研究成为可能。这些研究是重要的，因为现在有相当多的证据表明，在平流层和中间层中存在一种高振动激发的氧分子的有效生产机制。最近的测量证明，臭氧光解可以产生激发态高达v"26的O2。有人认为，这些被激发的氧分子可以显著地影响高层大气中的臭氧收支。例如，如果只有10-4的总臭氧光解导致激发O2(v ' 26)，则平流层臭氧浓度将增加10%。因此，涉及振动激发氧分子的机制可能是缺失的臭氧来源，这是解释大气模式无法重现平流层臭氧实际垂直剖面所必需的。本研究将探讨以下机制是否为平流层臭氧的重要来源：(1)O3 + hv (238 nm) O2(v ' 26) + O(3P) (2) O2(v ' 26) + O2 O3 + O(3) O + O2 + M O3 + M NET O3 + O2 O3 + O。本研究将采用腔环吸收光谱法测定上述机制中第二步的反应速率。温度依赖性测量也将被执行。此外，将尝试在226 nm处直接测量臭氧光解的振动分布，以便与其他工作者最近报告的结果进行比较。如果这些O2光解产物是振动激发的，那么这将确定高振动激发O2的大气来源及其在高层大气臭氧收支中的作用。