Free induction decay of ethyl acetate, one scan, Bruker Avance 400, St. Olaf College

This site is devoted to the sound of NMR. It was inspired by the work of Prof. Dr. Walter Bauer at the University of Erlangen-Nuremberg. Not quite as willing to attach alligator clips to boards in our brand new Bruker Avance 400 NMR spectrometer, I decided instead to see if it wouldn't be simpler to directly convert the free-induction decay (FID) signal to .wav format. After a little research about WAV files, and a bit of experimentation with available parameters, I'm delighted to report that this conversion is quite possible. In fact, I now have a link on my Windows computer in the Windows\sendto directory to a program, NMRTALK.EXE, which allows me to simply right-click on the FID file and listen to it directly. I don't know that this is particularly informative in the long run, but it's fun to see that the FID is, in fact, simply an audible signal (a voice print, essentially, of the sample). Let your ears do the fourier transformation. What do you hear? This is the sound of nuclei dropping to their ground state (shifted in frequency by the carrier, 400 MHz). I think it's kind of cool! Hope you enjoy it. All spectra were acquired and processed remotely using the OleNMR interface. Bob Hanson



cyclohexane/dichloromethane mixture

ethyl acetate


Screen shot of NMRTALK.EXE