Resonance-enhanced multiphoton-ionization photoelectron spectroscopy by a rectangular amplitude modulation

Abstract

In this Brief Report, we present a scheme to control the (2 + 1) resonance-enhanced multiphoton-ionization (REMPI) photoelectron spectrum in cesium (Cs) atom by shaping the femtosecond laser pulse with a rectangular amplitude modulation. We show that the amplitude-shaped laser pulse can induce a hole in the (2 + 1) REMPI photoelectron spectrum, and the position and width of the hole depend on the amplitude step position and amplitude modulation width. We also show that a high-resolution REMPI photoelectron spectrum and the fine energy-level structure of the excited states can be obtained by observing the holes in the (2 + 1) REMPI photoelectron spectrum. We believe that these theoretical results can provide a feasible method to study the excited-state or Rydberg-state structure and the laser-induced photoionization dynamics.

Pulse train dependence of electron dynamics during resonant femtosecond laser nonlinear ionization of a Na4cluster

“…As the frequency of the tailored laser pulses tuned to match that of the resonant transitions to an excited state in an atom or a molecule, an increase in sensitivity and selectivity of detection can be achieved, which is an effective method to study the photo-ionization and -dissociation dynamical process of the excited states [12]. During the resonance ionization process, it allows for the determination of the excited states in which Laser Physics…”

“…12 W cm −2 . After laser termination, as the pulse number increases from 1-4, the total absorbed energies are 19.921 eV, 8.234 eV, 6.556 eV and 5.062 eV, respectively.…”