Summary form only given. We present experimental observations along with theoretical modeling of laser induced continuum structure (LICS) in helium. The excited state 4s/sup 1/S/sub 0/ is coupled to the ionization continuum with strong laser radiation at 1064 nm. The induced continuum structure is detected by ionization of the state 2s/sup 1/S/sub 0/ with a weak laser pulse at 294 nm. Enhancement as well as strong reduction of ionization due to trapping of population can be observed. We demonstrate how LICS structures move about in a systematic way as a result of the AC Stark effect and power broadening. Quantitative comparison between theory and experiment is possible because of the high spectral resolution achieved in this experiment.Summary form only given. We present experimental observations along with theoretical modeling of laser induced continuum structure (LICS) in helium. The excited state 4s/sup 1/S/sub 0/ is coupled to the ionization continuum with strong laser radiation at 1064 nm. The induced continuum structure is detected by ionization of the state 2s/sup 1/S/sub 0/ with a weak laser pulse at 294 nm. Enhancement as well as strong reduction of ionization due to trapping of population can be observed. We demonstrate how LICS structures move about in a systematic way as a result of the AC Stark effect and power broadening. Quantitative comparison between theory and experiment is possible because of the high spectral resolution achieved in this experiment.

Conference on Lasers and Electro-OpticsJan 1, 19980 citations

Controlling ionization products through laser-induced continuum structure

Stefano Cavalieri, R. Eramo, Lorenzo Fini +3 more

We report on the observation of the modification of the two spin-orbit ionization continua of Xe through laser-induced continuum structure (LICS). The radiative decay of the Xe ground state into the two electronic continua that correspond to the two fine-structure levels of the ground state of the ${\mathrm{Xe}}^{+}$ ion can be varied by electromagnetically embedding a bound state of the atom into the two continua. The dressed ${}^{2}{P}_{1/2}$ continuum, probed from the atomic ground state through three-photon absorption, exhibits a clear induced structure, while the ${}^{2}{P}_{3/2}$ continuum possesses no observable structure under the present experimental conditions, as manifested through high-resolution photoelectron spectra. The modified ionization ratio is controlled by the wavelength of the dressing field.We report on the observation of the modification of the two spin-orbit ionization continua of Xe through laser-induced continuum structure (LICS). The radiative decay of the Xe ground state into the two electronic continua that correspond to the two fine-structure levels of the ground state of the ${\mathrm{Xe}}^{+}$ ion can be varied by electromagnetically embedding a bound state of the atom into the two continua. The dressed ${}^{2}{P}_{1/2}$ continuum, probed from the atomic ground state through three-photon absorption, exhibits a clear induced structure, while the ${}^{2}{P}_{3/2}$ continuum possesses no observable structure under the present experimental conditions, as manifested through high-resolution photoelectron spectra. The modified ionization ratio is controlled by the wavelength of the dressing field.

Physical Review AApr 1, 199831 citations

Laser-driven coherent manipulation of molecular chirality

Ioannis Thanopulos, Emmanuel Paspalakis, Z. Kis

Chemical Physics LettersApr 29, 200424 citations

Laser-Induced Atomic Structure

Dimitrios Charalambidis, Natalia E. Karapanagioti, O. Faucher +1 more

Springer eBooksJan 1, 19960 citations

{\mathrm{Xe}}^{+}

ion can be varied by electromagnetically embedding a bound state of the atom into the two continua. The dressed

{}^{2}{P}_{1/2}

continuum, probed from the atomic ground state through three-photon absorption, exhibits a clear induced structure, while the

{}^{2}{P}_{3/2}

continuum possesses no observable structure under the present experimental conditions, as manifested through high-resolution photoelectron spectra. The modified ionization ratio is controlled by the wavelength of the dressing field.