graphs on aluminum clusters

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Approximating (simulation) Al clusters spectra with Oxygen impurities from the sputtering target sample (comparing 99% to 99.99% pure Al target, by number of atoms). Using just a simple binary combination method. One can see Al 99.99% pure is enough, the amount of oxygen (the blue dots at the bottom) are very less abundant than the pure Al cluster peaks (blue dots at the top, spaced by 27 amu.)

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at 255 nm ionization wavelength, may be two photon ionization or one.. Source temperature LN2

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