Properties of isolated DNA bases, base pairs and nucleosides examined by laser spectroscopy E. Nir, Ch. Plützer, K. Kleinermanns and M. de Vries Eur. Phys. J. D, 20 3 (2002) 317-329 Published online: 13 September 2002 DOI: 10.1140/epjd/e2002-00167-2