Determination of Band Oscillator Strengths of Atmospheric Molecules from High Resolution VUV Cross Section Measurements

通过高分辨率 VUV 截面测量确定大气分子的能带振荡器强度

• 批准号: 9422854
• 负责人: William Parkinson
• 金额: $ 27万
• 依托单位: Harvard University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-12-01 至 1998-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9422854&HistoricalAwards=false
• 关键词: Determination; Band; Oscillator; Strengths; Atmospheric

9422854 Parkinson In the spectral region 175-205 nm, the penetration of solar radiation into the atmosphere is controlled by the absorption of the Schumann-Runge bands of molecular oxygen and some fraction of the transmitted radiation is available to photodissociate nitric oxide (NO) molecules in bands below 192 nm. In this project, measurements of the NO cross sections will be extended below 185 nm by using a unique vacuum ultraviolet (VUV) Fourier Transform (FT) spectrometer in combination with a synchrotron radiation source at the Photon Factory, in Tsukuba, Japan. The high resolution of the spectrometer is necessary for the determination of the absolute cross sections of molecular bands possessing distinct rotational structure. These absorption cross sections are needed to accurately calculate the NO dissociation rates in the middle atmosphere.

小行星9422854 在175-205 nm的光谱范围内，太阳辐射进入大气的穿透是由分子氧的舒曼-龙格带的吸收控制的，并且透射的辐射的一部分可用于在低于192 nm的带中光解一氧化氮（NO）分子。在这个项目中，NO横截面的测量将扩展到185 nm以下，通过使用一个独特的真空紫外（VUV）傅立叶变换（FT）光谱仪结合同步辐射源在光子工厂，在日本筑波。 光谱仪的高分辨率是确定具有不同转动结构的分子带的绝对截面所必需的。这些吸收截面是精确计算中层大气中NO解离速率所必需的。