We report on molecule fragmentation measurements of propane in high dense electron beams of a room-temperature electron beam ion source, the so-called Dresden EBIS-A. After fragmentation of propane molecules in the electron beam the fragments were continuously extracted and qA separated by a bifocal dipole magnet. Fragmentation spectra were measured at working gas pressures of 109mbar up to 108mbar, electron currents of 29mA up to 75mA, and electron energies of 11keV up to 15keV. Thereby all possible stoichiometric ratios of propane fragments were detected. At low electron beam currents the ion current output of the CHx+(x=03) and the C2Hx+(x=05) fragments is nearly identically. At higher electron currents the CHx+(x=03) peaks dominate the spectra and the ratio between the C+ peak and CHx+(x=03) peaks increases from 2:1 to 3:1. It was shown that the working gas pressure has no significant influence on the fragment distribution but on the total ion current.

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