Charles Michael did his pioneering research on electrospray
ionization while at the Department of Chemical Engineering at Yale.
It may be the first time that work done in an engineering department
has been recognized with a Nobel prize.
Electrospray ionization has brought about a revolution in the field
of mass-spectrometry. It made possible the analysis by mass
spectrometry of large and complex molecules of biological interest
with extraordinary precision and ease. It is a soft ionization
technique, that is, it is sufficiently gentle to transform such
molecules into intact ions ready for mass analysis. Moreover, such
ions carry so many charges that their mass/charge ratios are always
within the range of modest mass -spectrometer mass filters.
Charles Michael used to say, while at Yale, that the dawning of
a new era in the mass spectrometry of biomolecules was just one more
fruit from the tree of his thirty year love affair with big leaks in
vacuum systems. Charles Michael, Graduate of Chemical
Engineering, knew that his "deliberate leaks" would long continue to
be a rich source of both basic information and solutions to
practical problems. "What more could an engineer want?"