Tropospheric Photochemistry of Carbonyls: Elucidation of Quantum Yields to Quantify the Role of Ketones in Production of HOx and PAN-type Compounds in the Atmosphere

该项目将使用最先进的测量方法来研究大气中重要的光解反应。具体来说，该团队将开发一种新的方法，用于使用化学电离质谱法（CIMS）测量复杂分子的量子产率。初期的工作将集中于研究辐射与对流层上部的酮相互作用所产生的反应。研究小组将利用这些结果更好地了解对流层上部反应物质的浓度。该项目还将支持一项研究生研究和一名博士后研究人员的培训。研究人员将使用CIMS检测丙酮和其他酮光解的自由基反应产物，作为波长、O2、压力和温度的函数。数据将提供实验的限制，这将有助于我们了解对流层上层HOx和PAN预算。此外，这种测量量子产率的新方法有可能在未来的许多实验中使用。该奖项反映了NSF的法定使命，并被认为值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估来支持。

This project will use state-of-the-art measurement methods to investigate photolysis reactions that are important in the atmosphere. Specifically, the team will develop a new methodology for quantum yield measurements of complex molecules using chemical ionization mass spectrometry (CIMS). Initial efforts will focus on investigating reactions which arise from radiation interacting with ketones in the upper troposphere. The research team will use the results to better understand the concentrations of reaction species in the upper troposphere. The project will also support training of a graduate study and a postdoctoral researcher.The researchers will use CIMS to detect radical reaction products from the photolysis of acetone and other ketones as a function of wavelength, O2, pressure, and temperature. Data will provide experimental constraints which will contribute to our understanding of the upper tropospheric HOx and PAN budgets. Additionally, this new method for measuring quantum yields has the potentially to be used in numerous future experiments.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.