Absolute frequency and isotope shift measurements of the cooling transition in singly ionized indium Y. H. Wang, R. Dumke, J. Zhang, T. Liu, A. Stejskal, Y. N. Zhao, Z. H. Lu, L. J. Wang, Th. Becker and H. Walther Eur. Phys. J. D, 44 2 (2007) 307-311 Published online: 23 May 2007 DOI: 10.1140/epjd/e2007-00171-0