High-Resolution Selective Excitation of Resonance-Enhanced Multiphoton-Ionization Photoelectron Spectroscopy by Shaping Femtosecond Laser Pulses
CHENG Wen-Jing, ZHANG Shi-An** , JIA Tian-Qing** , FENG Dong-Hai, SUN Zhen-Rong
State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University, Shanghai 200062
Abstract ：Femtosecond laser-induced resonance-enhanced multiphoton-ionization photoelectron spectroscopy (REMPI-PS) is faced with two drawbacks of low spectral resolution and poor selective excitation due to the broad spectral bandwidth. We propose a scheme to obtain a high-resolution selective excitation of (2+1) REMPI-PS by combining π and cosinusoidal phase modulation. Our theoretical results indicate that the (2+1) REMPI-PS signals related to neighboring excited states can be differentiated from their indistinguishable photoelectron spectra by the π phase modulation, and then their selective excitation can be realized by supplementally adding the cosinusoidal phase modulation. Furthermore, the physical mechanism of the high-resolution selective excitation of (2+1) REMPI-PS is explained by considering the two-photon power spectrum.
出版日期: 2014-04-24
:
33.60.+q
(Photoelectron spectra )
32.80.Qk
(Coherent control of atomic interactions with photons)
32.80.Rm
(Multiphoton ionization and excitation to highly excited states)
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2014, Vol. 31 
