Chinese Optics Letters, 2010, 8 (3): 338, Published Online: Mar. 11, 2010
Experimental study on multiphoton ionization of Ar with high intensity short laser pulses
光电子能谱 多光子电离 Freeman 共振 300.6350 Spectroscopy, ionization 020.4180 Multiphoton processes 020.5780 Rydberg states
Abstract
We present high resolution photoelectron energy spectra from multiphoton ionization (MPI) of Ar subject to laser pulses with wavelength of 400 nm, pulse duration of 35 fs, and maximum intensity of 5×10<sup>13</sup> W/cm<sup>2</sup>. Ionizations into Ar<sup>+</sup> <sup>2</sup>P<sub>3/2</sub> and <sup>2</sup>P<sub>1/2</sub> channels are observed and distinct resonance structures are found in both ionization channels. The intensity dependence of the resonance structures is explained in terms of the mechanism of Freeman resonance, i.e., transient resonances of alternating current (AC) Stark-shifted Rydberg states at specific intensities within the laser pulse.
Xiaoyin Zhang, Wei Quan, Yang Wang, Huipeng Kang, Hongping Liu, Xiaojun Liu. Experimental study on multiphoton ionization of Ar with high intensity short laser pulses[J]. Chinese Optics Letters, 2010, 8(3): 338.