dear CCL'ers sorry about my e-mail. I touched the wrong nickname (ccl instead of christina) and did not check. Of course we do not submit such questions to the comp-chem list. regards, Christoph Widauer ---- Christoph Widauer Laboratorium f. Anorganische Chemie ETH-Zentrum CAB B24.1-3 Universitätsstrasse 6 CH-8092 Zuerich Phone (Zurich): +41 (1) 632 61 19 Fax (Zurich): +41 (1) 632 10 90 e-mail: widauer-: at :-inorg.chem.ethz.ch