n190703SE Academic Article uri icon

abstract

  • We present experimental results for the ionization of aniline and benzene molecules subjected to intense ultrashort laser pulses. Measured parent molecular ions yields were obtained using a recently developed technique capable of three-dimensional imaging of ion distributions within the focus of a laser beam. By selecting ions originating from the central region of the focus, where the spatial intensity distribution is nearly uniform, volumetric-free intensity-dependent ionization yields were obtained. The measured data revealed a previously unseen resonance-enhanced multiphoton ionization (REMPI)-like process. Comparison of benzene, aniline, and Xe ion yields demonstrates that the observed intensity-dependent structures are not due to geometric artifacts in the focus. Finally for intensities greater than 310 13 W/cm 2 , we attribute the ionization of aniline to a stepwise process going through the * state which sits three photons above the ground state and two photons below the continuum. 2011 American Physical Society.

published proceedings

  • Physical Review A

author list (cited authors)

  • Strohaber, J., Mohamed, T., Hart, N., Zhu, F., Nava, R., Pham, F., ... Schuessler, H. A.

publication date

  • January 1, 2011 11:11 AM