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用两束脉冲激光,一束使原子共振激发,另一束使激发态原子电离,当电离光脉冲能量约达1J/cm~2时,可使电离饱和.测量被电离原子数的相对大小与电离光脉冲能量之间的函数关系,可以方便地得出原子激发态的光电离截面.延迟电离光至激发光脉冲结束后到达作用区,可以修正激发光对电离的贡献,并避免电离光引起的Stark位移对共振激发的影响.应用共振激发延迟电离方法测定了Cs原子7~2P_(3/2)态的光(λ=5320(?))电离截面,测量值σ_I=6.5×10~(-18)cm~2与Manson的计算值非常接近. 相似文献
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为了更有效地测量用于上海同步辐射光源波荡器的积分场误差,在已有的伸展线磁测系统的基础上研制了一套翻转线圈磁测系统,该系统的运动控制、数据采集和数据分析处理均可自动完成。在利用这套磁测系统测量3.4×10-6 T·m磁场积分时获得高于1×10-6 T·m的测量精度,初步的实验结果表明这套波荡器积分磁场测量系统具有测量精度好、速度快的特点,与已有的伸展线磁测系统、平移线圈磁测系统和霍尔点测系统相比,它更适合于测量波荡器的一、二次场积分和多极场分量。 相似文献
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本文研究了云南金所第三纪褐煤盆地中泥炭藓煤在人工热模拟条件下产油、产气特征及元素组成、生物标记化合物等有机地球化学特征,并与同煤化程度的木质褐煤进行了对比。研究结果表明:随着成熟度的增高,泥炭藓煤具有很高的生烃能力:其最大生油率为501mg/g corg。,最大产烃量为232.1mg/g corg;在R_(ran)~o为2.51对,泥炭藓煤产气率达620.5ml/g corg。由于泥炭藓煤在成煤植物、成煤环境及物理化学性质上都不同于一般的腐植褐煤,因而是一种新的煤成油、煤成气的母质类型。 相似文献
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A preliminary study of simulated thermal maturity has been conducted to evaluate the oil, gas and hydrocarbon generation potential of sphagnum coal in the Jinsuo brown coal basin, Yunnan Province and to understand the characteristics of the element composition and biomarkers in the course of thermal alteration. The experimental result was compared with that of xylitic coal, a kind of lithotype of soft brown coal. It is considered that sphagnum coal possesses the potential of forming economic accumulation of oil and gas. Its highest proportion of oil and hydrocarbon generation is 510 mg/g Corg. and 232.1 mg/g Corg. respectively. At an R_(ran)~° value of 2.51%, the ratio of gas generation from sphagnum coal attains to 620.5 ml/g Corg. In view of sphagnum coal being different from the conventional soft brown coal in various respects such as coal forming raw materials and enviroments as well as physico-chemical properties, it is Suggested as a special kind of source rock for coal-generated oil and gas. 相似文献
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