Interferece of Two Shape Resonances Probed by Rescattering Photoelectron Spectroscopy of CO2

[摘要] Footprint of shape resonance is observed in angle-resolved rescattering photoelectron spectra (RPS) of CO2induced by intense femtosecond laser pulses. The rescattering spectra are compared with theoretical calculations of the differential cross sections (DCSs) of electron scattering by CO+2. The RPS and DCSs show a clear dip where collision momentum of electron is around 1.2 atomic unit. This dip is interpreted theoretically as the interference of two different shape resonances, where electrons in the continuum states are trapped by the potential barrier of the electron-ion scattering potential.

[发布机构] Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai; 980-8577, Japan^1;Department of Chemistry, Texas A and M University, College Station; TX; 77843-3255, United States^2;Department of Engineering Science, University of Electro-Communications, Chofu, Tokyo; 182-8585, Japan^3

[关键词] Continuum state;Different shapes;Differential cross section;Electron-ion scattering;Intense femtosecond laser pulse;Photoelectron spectrum;Potential barriers;Theoretical calculations