TWO-PHOTON ABSORPTION USING SYNCHROTRON RADIATION: A NOVEL TECHNIQUE

We have measured for the first time two-photon absorption spectra using synchrotron radiation and the light of a Nd-Yag laser. This new technique opens the possibility of performing nonlinear spectroscopy in the vacuum ultraviolet region. As an example of application, we present and discuss the two-photon absorption spectra near the fundamental thresholds of KI, KCl, and NaCl.