Journal of Physics B Atomic Molecular and Optical Physics

Population trapping in rare gases

Abdossamad Talebpour, C-Y Chien, S. L. Chin

Published Dec 14, 1996• 67 citations

Abstract

Using very stable intense fs Ti:sapphire laser pulses, new structures in the ion versus intensity plot of rare gases are observed which can be attributed to electron trapping in highly excited states of the atom. Employing a -type trapping we were able to partially explain the observation.

DOI: 10.1088/0953-4075/29/23/015

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Journal of Physics B Atomic Molecular and Optical Physics

Population trapping in rare gases

Abdossamad Talebpour, C-Y Chien, S. L. Chin

Published Dec 14, 1996• 67 citations

Publisher

Abstract

DOI: 10.1088/0953-4075/29/23/015

Related papers

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6{P}_{3/2}

pumped with an 852-nm laser and

7{S}_{1/2}

with a 1470-nm laser) and a tunable femtosecond (fs) Ti:sapphire laser for the final ionization step. The magnetic field of the MOT is switched off during the photoionization step. The natural bandwidth of the fs laser is reduced to 4 meV using optical spectral filters. Precise tuning of the photon energy makes it possible to observe the transition regime between direct photoemission into the open continuum and field-induced ionization of highly excited Rydberg states. The paths can be identified by their characteristic dependency on the extraction field and on the Ti:sapphire polarization. TOF analysis allowed us to disentangle the ionization paths and the dependence of the spatiotemporal distribution of the cold electrons on the polarization of the ionizing laser.