Abstract
Ions may be formed by different mechanisms (lasers, ion beams etc.), using fast dissipation of energy at a solid surface, causing a non-equilibrium phase transition of the surface material. Some years ago a technique was proposed using very short high-current electrical pulses through a thin wire for transferring sufficient energy to desorb material from the wire surface. The authors have modified this technique to eliminate the most severe problems connected with the original ion source. The improved ion source consists of a thin aluminium film on a planar substrate. The generation of ions from an active area of the aluminium film, which can be coated with a sample substance, can be simply actuated by a short electrical pulse with significantly less energy compared with the original ion source. Some first investigations of the characteristics of the ion source are presented, using both a time-of-flight and a Fourier transform ion cyclotron resonance mass spectrometer.
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