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resonant two-photon ionization

chemical process

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study of clusters

  • Figure 1: The four stable geometric structures of the seven-atom cluster of argon, in order of increasing energy: (A) A pentagonal bipyramid. (B) A regular octahedron with one face capped by the seventh atom. (C) A regular tetrahedron with three of its faces capped by other atoms. (D) A trigonal bipyramid with two of its faces capped by other atoms; although this has the highest energy of the four structures, it is very close in energy to the tricapped tetrahedron.
    In cluster: Ionization and sorting of clusters

    This process, called resonant two-photon ionization, is highly selective if the clusters being separated have moderately different absorption spectra. Since this is frequently the case, the method is quite powerful. As the experimenter varies the wavelength of the first exciting laser, a spectrum is produced that includes those…

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