rolling baseline

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hello all.

one of our users is doing 1H of (paramagnetic) iron prophyrins which
have chem shift range of about 200 ppm.

he is seeing a rather dramatic rolling baseline.

any ideas on how to minimize this problem, either through manipulation
of sample or acquisition
parameters?  (400 MHz Varian Inova)  i suspect the solution, if there is
one, is well-known (?).

thanks very much in advance,

jdt

--
John D. Thoburn
Department of Chemistry
Santa Clara University
Santa Clara, CA 95053

john@chemo2.scu.edu
ph: 408-554-4796
fx: 408-554-7811

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