Observation of High-Lying Rydberg States Survived 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 Jan 1, 2015• 0 citations

Publisher

Abstract

We observed high-lying (n>238) Rydberg states which survived from strong field interaction of atoms and molecules with electron and ion coincidence detection. The high-lying Rydberg states are measured through field ionization with weak DC fields.

DOI: 10.1364/cleo_qels.2015.fth4c.8

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6G

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=28

up to

n>100

. High-resolution spectroscopic studies have led to measurement of the fine structure for

\mathrm{np}

levels located between

n=28

and

n=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.

({F}_{c})

, coincident detection of the photoelectrons and photoions with well-chosen arrival times is performed. Based on a fitting to the time dependence of the coincidently measured photofragment yields with a semiempirical formula, we can extract a principal quantum number distribution (PQND) of the population of the excited states in a range closely related to the strength of

{F}_{c}

. The extracted valid PQND is in qualitative agreement with a semiclassical model calculation. Our work thus provides a method to extract the PQND and study the ultrafast high-lying Rydberg state excitation.