Jefferson Lab in the News
Putting Free-Electron Lasers to Work
Comparing mass spectra of polyethylene glycol films deposited by pulsed-laser deposition with conventional versus free-electron lasers. The top trace is from a film created by a conventional ultraviolet pulsed excimer laser at 193 nm. The middle trace is from a film ablated and deposited by the Vanderbilt FEL operating at the molecule's 2.9-mm infrared vibrational resonance. The FEL deposition produces a much more faithful representation of the bulk target material, whose spectrum is shown in the bottom trace.