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arXiv:0711.1367 · Chemical Physics

Femtosecond induced transparency and absorption in the extreme ultraviolet by coherent coupling of the He 2s2p (1Po) and 2p2 (1Se) double excitation states with 800nm light

Zhi-Heng Loh, Chris H. Greene, Stephen R. Leone

Published Nov 27, 2007• 91 citations
arXivHTMLPDF
DOI
10.1016/j.chemphys.2007.11.005

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Electromagnetically-induced-transparency-like behavior in the extreme-ultraviolet region is studied theoretically, including the effect of intense 800 nm laser dressing of He 2s2p(1Po{}^{1}\phantom{\rule{-0.16em}{0ex}}{P}^{o}1Po) and 2p2{}^{2}2(1Se){(}^{1}\phantom{\rule{-0.16em}{0ex}}{S}^{e})(1Se) autoionizing states. We present an ab initio solution of the time-dependent Schr\"odinger equation in an LSLSLS-coupling configuration-interaction basis set. The method enables a rigorous treatment of optical field ionization of these coupled autoionizing states into the N=2N=2N=2 continuum in addition to N=1N=1N=1. Our calculated transient absorption spectra show encouraging agreement with experiment.