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

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  • B. Ómarsson, Science Institute
  • ,
  • I. Bald
  • O. Ingólfsson, Science Institute
In UV laser desorption/ionization (LDI) of C , both molecular cations and anions are formed. While the C formation has been discussed in a number of studies and is fairly well understood, the C formation has received less attention. Here, we present measurements of C and C formation and its fluence dependence in UV-LDI of C60 from both metallic and non-metallic substrates. The data show clearly that the C formation is coupled to the C formation, indicating that C is predominantly formed through electron transfer early in the expanding laser desorption plume. The velocity distribution of desorbed C ions was also determined and was found to be best described by two Maxwell-Boltzmann distributions with superimposed stream velocities.
OriginalsprogEngelsk
TidsskriftThe European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics
Vol/bind66
Nummer3
Sider (fra-til)72
ISSN1434-6060
DOI
StatusUdgivet - 1 mar. 2012

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