Simultaneous Measurement of Mass and Velocity Distributions of Cluster Beams by Orthogonal Acceleration Time-of-Flight Mass Spectrometers.

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In order to study cluster beams, it is essential to measure their mass and velocity distributions as the fundamental characteristics. We demonstrate an experimental method to simultaneously measure both the mass spectrum and the beam velocities by the orthogonal acceleration time-of-flight mass spectrometer. The method is based on the ion-interruption effect of the electrode wire-mesh in the accelerator. The neutral clusters are photoionized in a small area in the accelerator, accelerated perpendicularly to the cluster beam axis, mass-analyzed and detected. Depending on the mass and the beam velocity, specific ions are interrupted by the wires arranged with a equal spacing and can not reach the detector. This ion-interruption effect modulates the transmittance of the ions, yielding the apparent oscillations in the mass spectra. Unfolding these modulated mass spectra, we have successfully measured both the mass spectrum and the beam velocities as a function of the mass simultaneously.

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  • 質量分析

    質量分析 50 (1), 11-14, 2002

    一般社団法人 日本質量分析学会

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