Dear Simon, My name is Chris Reddy, one of the guys Alex Sessions mentioned in his email to you. As for most of your questions about pyrolysis of chlorinated compounds, Tom Burgoyne has done a series of experiments and has written rough draft about some very interesting results. He may be slighlty delayed as he just started a professorship at Oklahoma State. I believe he is teaching freashmen chem this semester (hence, he may be swamped). Nevertheless, Tom is the nuts and bolts guy you want to talk to. As for me, I have been doing alot of online and offline stable isotope (Cl, H, C, N) and radiocarbon compound-specific analysis of semi-volatile organic contmaminats (i.e. PAHs, PCBs, etc). I just sent my first manuscript on Cl isotopes in PCBs to Env. Sci and Tech. I have not heard from the editors. Please keep in touch as I am interested in any of your results. Good luck. I will be in Europe for the next 2 weeks. Bye, Chris Reddy