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Physical Review A

Anticrossing spectroscopy of K Rydberg atoms using 300-K blackbody radiation

R. C. Stoneman, G. R. Janik, Thomas F. Gallagher

Published Oct 1, 1986• 31 citations
Publisher

Abstract

The avoided crossings in an electric field of K s and p states with the nearly hydrogenic Stark manifold states have been investigated using 300-K blackbody radiation. Anticrossings between states of the same \ensuremath{\Vert}${m}_{j}$\ensuremath{\Vert} for which the \ensuremath{\Vert}${m}_{l}$\ensuremath{\Vert} values are the same or differ by one are encountered. The anticrossings between states of the same \ensuremath{\Vert}${m}_{l}$\ensuremath{\Vert} are quite wide as they are due to core penetration and polarization effects. The anticrossings for which \ensuremath{\Vert}${m}_{l}$\ensuremath{\Vert} differs by one are produced by the spin-orbit interaction and are accordingly quite small. We present results for the ns states for n in the range 18--29 and for the np states for n in the range 19--23.

DOI
10.1103/physreva.34.2952

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The avoided crossings in an electric field of K s and p states with the nearly hydrogenic Stark manifold states have been investigated using 300-K blackbody radiation. Anticrossings between states of the same \ensuremath{\Vert}mj{m}_{j}mj​\ensuremath{\Vert} for which the \ensuremath{\Vert}ml{m}_{l}ml​\ensuremath{\Vert} values are the same or differ by one are encountered. The anticrossings between states of the same \ensuremath{\Vert}ml{m}_{l}ml​\ensuremath{\Vert} are quite wide as they are due to core penetration and polarization effects. The anticrossings for which \ensuremath{\Vert}ml{m}_{l}ml​\ensuremath{\Vert} differs by one are produced by the spin-orbit interaction and are accordingly quite small. We present results for the ns states for n in the range 18--29 and for the np states for n in the range 19--23.
We report the observation of anticrossing signals arising from the interaction of 300-K blackbody radiation with Rydberg atoms near avoided crossings of Stark levels. The role of the blackbody radiation is roughly analogous to that of the resonance fluorescence in traditional anticrossing spectroscopy. We present preliminary results for avoided crossings of ns\mathrm{ns}ns states with $n\ensuremath{-}2$ Stark states in potassium for nnn in the range 18-21.
We have measured the avoided crossings between the Cs (n+4)s states and the lowest three members of the adjacent n Stark manifold for 20<or=n<or=24 using a novel technique based on the differences in the pulsed field ionization of the states under study. The measured positions of the avoided crossings are in excellent agreement with values calculated by matrix diagonalization, and the experimentally determined widths of the avoided crossings, which range from 29 to 78 MHz, are in reasonable agreement with the calculated values.
Rydberg states in lithium have been excited from the ground state by absorption of \ensuremath{\pi}-polarized photons in the presence of parallel electric F and magnetic B fields. The magnetic field strength (B=3.11 T) is high enough to reach the inter-n-mixing regime, and a small electric field strength (F\ensuremath{\simeq}25 V/cm) is sufficient for the lowest state of the n=30 manifold to penetrate into the high-energy part of the n=29 manifold. The first anticrossing is thoroughly studied. Away from the anticrossing the spectrum exhibits two lines, but at the anticrossing a third component appears in the structure in the same energy range. This provides an experimental confirmation for the existence of pairs of almost-degenerate states with opposite parities in the high-energy part of the diamagnetic manifold of lithium. The two components of this doublet behave differently at the anticrossing. The experimental data have been interpreted in a global treatment in which core effects and intermanifold couplings are simultaneously taken into account. The different behavior of low- and high-lying states of the multiplet with respect to these two interactions is analyzed in detail.
The Stark effect of ultra-cold Cs Rydberg atom is investigated in a magneto-optical trap, and the avoided crossing between nS state and (n-4) manifold is observed. The ion spectrum near the avoided crossing is obtained by using state-selective field pulse ionization technique. By changing the intensity of the applied electric field, we find that the relative intensities of two Stark states near the avoided crossing exchange obviously. Furthermore, state transfer from nS Rydberg state to high-l state due to the avoided crossing is also obtained.
We have measured the locations and widths of the avoided level crossings between (n+3)s states and n,k Stark states in Rydberg Rb atoms with principal quantum numbers n between 16 and 25. We use two-step laser excitation to excite (n+3)s states in the presence of an electric field and observe a change in the number of atoms driven to higher-lying states by blackbody radiation as the electric field is tuned through the avoided level crossings. We have measured both the positions and widths of the avoided crossings. \textcopyright{} 1996 The American Physical Society.
The n=60, L z =0 angular momentum manifold in helium is studied in the presence of an electric field parallel to a fixed magnetic field (B=0.1539 T). Results obtained from a CW laser-atomic beam experiment are compared with diagonalization calculations and with a WKB approximation including core effects. Core-induced anticrossings have been analysed in detail. The supersymmetry, including quasi-crossings in hydrogen to occur at the same value of the electric field strength, does not apply for L z =0 manifolds in non-hydrogenic Rydberg atoms.