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Negative ion formation mechanism and velocity distribution in laser desorption/ionization of C60

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Abstract

In UV laser desorption/ionization (LDI) of C60, both molecular cations and anions are formed. While the C +60 formation has been discussed in a number of studies and is fairly well understood, the C 60 formation has received less attention. Here, we present measurements of C 60 and C +60 formation and its fluence dependence in UV-LDI of C60 from both metallic and non-metallic substrates. The data show clearly that the C 60 formation is coupled to the C +60 formation, indicating that C 60 is predominantly formed through electron transfer early in the expanding laser desorption plume. The velocity distribution of desorbed C 60 ions was also determined and was found to be best described by two Maxwell-Boltzmann distributions with superimposed stream velocities.

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Correspondence to I. Bald or O. Ingólfsson.

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Ómarsson, B., Bald, I. & Ingólfsson, O. Negative ion formation mechanism and velocity distribution in laser desorption/ionization of C60 . Eur. Phys. J. D 66, 72 (2012). https://doi.org/10.1140/epjd/e2012-20639-x

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  • DOI: https://doi.org/10.1140/epjd/e2012-20639-x

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