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Journal of Physics Conference Series

High-Lying Rydberg States from Strong Field Interaction

Seyedreza Larimian, Sonia Erattupuzha, Raffael Maurer, C. Lemell, Stefan Nagele, S. Yoshida, Joachim Burgdörfer, Andrius Baltuška, Markus Kitzler, Xinhua Xie

Published Sep 7, 2015• 0 citations
Publisher

Abstract

We experimentally observed high-lying (n>238) Rydberg states which are formed through recapture of electrons after strong field interaction in atoms and small molecules using electron and ion coincidence detection. The high-lying Rydberg states are identified through weak DC field-induced ionization.
DOI
10.1088/1742-6596/635/9/092084

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This paper summarizes a long series of experiments that have been done on Rydberg states of Rb. The basic experimental technique that has been used is atomic-beam laser spectroscopy which allows both low-resolution and high-resolution studies. Excitation of Rydberg states is provided by single-photon absorption from a suitably frequency-doubled rhodamine 6G6G6G tunable laser. Detection is done by field ionization and ion counting. These techniques have allowed us to study the critical ionizing field, which has been found to follow classical, hydrogenic behavior closely. Rydberg states of Rb have been observed from n=28n=28n=28 up to n>100n>100n>100. High-resolution spectroscopic studies have led to measurement of the fine structure for np\mathrm{np}np levels located between n=28n=28n=28 and n=60n=60n=60, as well as the isotope shift of the ground state, $\ensuremath{\delta}\ensuremath{\nu}=(172\ifmmode\pm\else\textpm\fi{}15)$ MHz. Anomalies in the intensity ratio of the doublet $5s\ensuremath{-}np$ transitions have been observed and interpreted as relativistic effects. Perturbations by weak and strong dc electric field are reported. In the case of weak electric fields it is possible to evaluate the polarizability. In the case of strong dc electric fields, new phenomena have been observed and analyzed. We also find experimental evidence of selective photoionization in the presence of an appropriate dc electric field, which could have some applications in laser isotope separation. Finally, we give the preliminary results of an experiment on the effect of a strong nonresonant electromagnetic field on high-lying Rydberg states.