A high-sensitivity laser microprobe mass analyzer |
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Authors: | F. Hillenkamp E. Unsöld R. Kaufmann R. Nitsche |
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Affiliation: | 1. Gesellschaft für Strahlen- und Umweltforschung mbH, München, D-8042, Neuherberg, Germany 2. Institut für klinische Physiologie, Universit?t Düsseldorf, D-4000, Düsseldorl, Germany
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Abstract: | A laser microprobe mass analyzer has been developed. It is intended for application in biomedical and physiological research. A frequency-doubled ruby laser is focussed through an incident light microscope to a spot of minimally 0.5 μm in diameter on a thin section specimen of 0.1–1.5 μm thickness. The microplasma generated from the irradiated volume is analyzed in a time-of-flight mass spectrometer recording the complete spectrum for each shot. From lithium doped epoxy resin (5 ppm by weight), used as an organic standard, 1.4×10−19g or 1.4×104 atoms of the6Li isotope have been detected. This sensitivity corresponds to that of ion microprobes but is at least an order of magnitude higher than obtained with electron probe X-ray microanalyzers. |
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Keywords: | Laser microprobe Micro-mass analysis |
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