An intensity-difference spectrum method is developed to disentangle the intensity volume effect inherent in focused laser beam interaction with gas-phase matter. This method is applicable to a Gaussian beam of constant axial intensity, which keeps the exact contribution from a predetermined intensity range and eliminates the contributions from lower intensities. We apply this method to the angularly resolved kinetic energy release spectrum of laser-induced dissociation of H2+. The difference spectrum at higher intensities is found to be dominated by the bond-softening process, and the distribution shifts to lower energy and becomes narrower with increasing intensity.
© 2005 Optical Society of America
Pengqian Wang, A. Max Sayler, Kevin D. Carnes, Brett D. Esry, and Itzik Ben-Itzhak, "Disentangling the volume effect through intensity-difference spectra: application to laser-induced dissociation of H2+," Opt. Lett. 30, 664-666 (2005)