The probe on the I400 got contaminated by some user(s) lately. The contaminates give rise to two proton peaks around 0ppm. If you have broken a sample or had your sample spilled into the probe on the I400, you should contact me (Frank) or Doug immediately. I need to figure out an appropriate solvent for cleanup.
I’m going to work on the probe cleanup tomorrow. For time being, you can still use the I400 for 13C, 19F, and 31P. You can also do 1H on the I400 if you don’t care the small extra peaks around 0ppm.