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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Electron impact study of the 100 eV emission cross section and lifetime of the Lyman-Birge-Hopfield band systemof N_2: Direct excitation and cascade
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Electron impact study of the 100 eV emission cross section and lifetime of the Lyman-Birge-Hopfield band systemof N_2: Direct excitation and cascade

机译：电子100电动汽车排放影响研究交叉节和Lyman-Birge-Hopfield的一生带系统甲烷:直接激发和级联

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We have measured the 100 eV emission cross section of the optically forbidden Lyman-Birge-Hopfield (LBH) band system (a~1Π_g → X~1Σ_g~+) of N_2 by electron-impact-induced fluorescence. Using a large (1.5 m diameter) vacuum chamber housing an electron gun system and the Mars Atmosphere and Volatile EvolutioN mission Imaging Ultraviolet Spectrograph optical engineering model, we have obtained calibrated spectral measurements of the LBH band system from 115 to 175 nm over a range of lines of sight to capture all of the optical emissions. These measurements represent the first experiment to directly isolate in the laboratory single-scattering electron-impact-induced fluorescence from both direct excitation of the a~1Π_g state and cascading contributions to the a~1Π_g state (a~('1)Σu and w~1Δ_u → a~1Π_g → X~1Σ_g~+). The determination of the total LBH emission cross section is accomplished by measuring the entire cylindrical glow pattern of the metastable emission from electron impact by imaging lines of sight that measure the glow intensity from zero to ~400mmradial distance and calculating the ratio of the integrated intensity from the LBH glow pattern to that of a simultaneously observed optically allowed transition with a well-established cross section: NI 120.0 nm. The "direct" emission cross section of the a~1Π_g state at 100 eV was determined to be σ_(dir)~(em) = (6.41 ± 1.3) × 10~(-18) cm~2. An important observation from the glow pattern behavior is that the total (direct + cascading) emission cross section is pressure dependent due to collision-induced cascade transitions between close-lying electronic states.
机译：我们已经测量了100 eV发射截面光的禁止Lyman-Birge-Hopfield(李秉宪饰)带系统(~ 1Π_g→X ~ 1Σ_g ~ +)的甲烷electron-impact-induced荧光。大(1.5米直径)真空室住房电子枪系统和火星大气和挥发性进化的使命成像紫外线摄谱仪光学工程模型,我们有校准光谱测量获得秉宪带系统从115年到175 nm范围内行视觉捕捉所有的光排放。在实验室实验中直接分离单散射electron-impact-induced荧光的直接激励~ 1Π_g状态和级联贡献a * 1Π_g州(a *(公元”Σ1)w 1Δ_u→a * 1Π_g→X ~ 1Σ_g ~ +)。通过发射截面测量整个圆柱的发光模式亚稳从电子发射的影响成像光线测量发光强度从0 ~ 400 mmradial距离和计算整体强度的比值从秉宪的发光模式同时观察到光允许过渡的截面:倪120.0海里。的~ 1Π_g国家100电动汽车决心一个重要的观察从发光模式行为是总(直接+级联)发射截面是依赖于压力collision-induced级联之间的转换绺绺小电子状态。

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