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- W2029657296 abstract "Abstract We describe two techniques for identifying double-negative molecular ions. In the first, accelerator mass spectrometry (AMS) is used to identify and count the atomic fragments produced when a molecular dianion is destroyed at the terminal of a tandem accelerator. This method can determine unequivocally the chemical composition of a molecular ion. It is most easily implemented for cluster ions with constituents that can be produced in states of identical magnetic rigidity (e.g. clusters composed of several identical atoms). The other, Coulomb Explosion Imaging (CEI), produces a “picture” of the dianion showing each atom. The diameter and length of the tracks are related to the Z s of the particles producing them. Using these techniques, we discovered a new class of gaseous dianions. These dianions are noteworthy because they can be produced with intensities that are at least 10 times greater than the intensities achieved with any other known double-negative ion. They are of the form BeC 2− n , where n is even and greater than or equal to 4. The largest dianion that we have observed is BeC 2− 14 . A second weaker class of dianions of the form Be 2 C 2− n has also been observed for n =6 and 10. No dianions containing an odd number of carbon atoms were observed. A lower limit for the lifetimes for the most abundant ions is at least 5 μs." @default.
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- W2029657296 date "1999-10-01" @default.
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- W2029657296 title "Observation of BeC2−, a particularly abundant gaseous dianion" @default.
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- W2029657296 doi "https://doi.org/10.1016/s0168-583x(99)00178-0" @default.
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