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    • 2. 发明授权
    • Mean cluster size determination using water capture
    • 使用水捕获的平均群集大小确定
    • US5767511A
    • 1998-06-16
    • US686005
    • 1996-07-25
    • Michel Macler
    • Michel Macler
    • H01J49/04H01J49/26
    • H01J49/147H01J27/026H01J49/0422H01J2237/0812
    • Clusters, such as Argon gas clusters, provided by a cluster source are doped in a water pick-up cell, and subsequent electron impact ionization of the doped clusters in a mass spectrometer or gas analyzer produce ionized cluster fragments that retain water. Water is supplied under pressure to the pick-up cell disposed within a vacuum chamber, and the water pressure is metered by a metering valve and monitored by a pressure gauge. A vacuum pump is coupled to the vacuum chamber that generates a vacuum within the vacuum chamber and pick-up cell. Interaction between the gas clusters and the water in the pick-up cell produces doped clusters, some of which retain water. The electron impact ionized doped cluster fragments are analyzed using the mass spectrometer or gas analyzer permits determination (detection) of the mean cluster size of the clusters. The variation in intensity of the water-containing fragments versus water pressure in the pick-up cell exhibits a Poisson behavior, from which the cross-section and mean cluster size is derived.
    • 由聚簇源提供的诸如氩气团簇的簇被掺杂在吸水池中,并且随后在质谱仪或气体分析仪中的掺杂簇的电子轰击电离产生保留水的电离簇片段。 将水在压力下供给到设置在真空室内的拾取池中,并且通过计量阀计量水压并通过压力计监测水压。 真空泵耦合到真空室,在真空室和拾取单元内产生真空。 气体簇和吸收池中的水之间的相互作用产生掺杂的簇,其中一些保留水。 使用质谱仪或气体分析仪分析电子轰击电离掺杂的簇片段,以允许确定(检测)簇的平均簇大小。 含水碎片的强度与拾取池中水压的变化呈现出泊松行为,从中可以得出横截面和平均簇尺寸。