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

在175-205 nm光谱区，太阳辐射对大气的穿透受分子氧舒曼-龙格波段的吸收控制，在192 nm以下波段，部分透射辐射可用于光解一氧化氮（NO）分子。在这个项目中，通过使用独特的真空紫外（VUV）傅立叶变换（FT）光谱仪结合日本筑波光子工厂的同步加速器辐射源，对NO横截面的测量将扩展到185 nm以下。要测定具有不同旋转结构的分子带的绝对横截面，需要高分辨率的光谱仪。需要这些吸收截面来精确计算中大气中NO的解离速率。

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.