Abstract

The past decade has been characterised by the unpredicted blossoming of ultra high spectrally and spatially resolving microscopic and spectroscopic techniques. Well known examples of these are scanning tunneling microscopy and high resolution laser spectroscopy. The ultimate goal in resolution and sensitivity is the detection of single atoms or molecules. This has been achieved by both techniques. Atomic resolution in various scanning probe techniques is rather common at present /1/. The possibility to isolate and detect single atoms in laser spectroscopy has been demonstrated approximately 10 years ago /2/. Recently it has also been shown that it is possible to do optical spectroscopy on single molecules in liquids /3/ as well as in solids at low temperature /4,5/. In this communication we want to report results on electron spin resonance (ESR) on single molecules and hence on single electron spins in solid matrices at low temperature.

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