arXiv:1408.3506 · Physical Review A

Probing an excited-state atomic transition using hyperfine quantum-beat spectroscopy

Christopher G. Wade, Nikola Šibalić, James Keaveney, Charles S. Adams, Kevin J. Weatherill

Published Sep 25, 2014• 11 citations

Abstract

A new method to probe the dynamics of excited states using quantum beats between lower-lying hyperfine states is presented, which is particularly advantageous in room-temperature vapors where `traditional' methods based on continuous excitation fail.

DOI: 10.1103/physreva.90.033424

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arXiv:1408.3506 · Physical Review A

Probing an excited-state atomic transition using hyperfine quantum-beat spectroscopy

Christopher G. Wade, Nikola Šibalić, James Keaveney, Charles S. Adams, Kevin J. Weatherill

Published Sep 25, 2014• 11 citations

arXiv HTML PDF

Abstract

DOI: 10.1103/physreva.90.033424

Related papers

Nonstationary CARS spectroscopy of atomic thallium vapor: quantum beats of hyperfine components of the 6P 1/2 -6P 3/2 transition under conditions of significant collisional broadening

Feruz Ganikhanov, V. N. Kulyasov, I. G. Konovalov +2 more

Optics and SpectroscopyFeb 1, 19912 citations

Advanced undergraduate lab on quantum beats

Matthew Wright, R. Beban, Olivia Chierchio +3 more

Spontaneous emission has been studied by physicists for decades and continues to reveal exciting physics. We describe an experiment to study the spontaneous emission of a monoatomic vapor at room temperature as a fundamental experiment for upper-level physics undergraduates. The experiment begins by exciting a population of Rb atoms in a room temperature vapor cell with a laser pulse shorter than the average lifetime of the excited states. The resulting fluorescence signal is recorded as a function of time, and the excited state lifetime can be determined by measuring the decay rate. By analyzing the Fourier transform of the time-dependent polarized fluorescence signal, quantum interference (i.e., quantum beating) is observed among the hyperfine energy levels. This experiment can be completed by upper-level undergraduates in physics to demonstrate and connect hands-on experiments with concepts in atomic and quantum physics classes.Spontaneous emission has been studied by physicists for decades and continues to reveal exciting physics. We describe an experiment to study the spontaneous emission of a monoatomic vapor at room temperature as a fundamental experiment for upper-level physics undergraduates. The experiment begins by exciting a population of Rb atoms in a room temperature vapor cell with a laser pulse shorter than the average lifetime of the excited states. The resulting fluorescence signal is recorded as a function of time, and the excited state lifetime can be determined by measuring the decay rate. By analyzing the Fourier transform of the time-dependent polarized fluorescence signal, quantum interference (i.e., quantum beating) is observed among the hyperfine energy levels. This experiment can be completed by upper-level undergraduates in physics to demonstrate and connect hands-on experiments with concepts in atomic and quantum physics classes.

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We report observation of hyperfine quantum beats in the light emitted by the

7{^{2}P}_{\frac{3}{2}}

level of

{\mathrm{Cs}}^{133}

after excitation by a short resonant dye laser pulse. Frequency analysis of the beats provides a measurement of the hyperfine splittings in agreement with previous work. The usefulness of quantum-beat detection as a new method of laser spectroscopy without complications from the Doppler effect is discussed.

We study the excitation redistribution from cesium

7\mathrm{P}_{1/2}

7\mathrm{P}_{3/2}

to neighboring energy levels by Black Body Radiation (BBR) and inter atomic collisions using pump-probe spectroscopy inside a vapor cell. At low vapor densities we measure redistribution of the initial, velocity-selected, atomic excitation by BBR. This preserves the selected atomic velocities allowing us to perform high resolution spectroscopy of the

\mathrm{6D\rightarrow 7F}

transitions. This transfer mechanism could also be used to perform sub-Doppler spectroscopy of the cesium highly-excited

\mathrm{nG}

levels. At high densities we observe interatomic collisions redistributing the excitation within the cesium

\mathrm{7P}

fine and hyperfine structure. We show that

\mathrm{7P}

redistribution involves state-changing collisions that preserve the initial selection of atomic velocities. These redistribution mechanisms can be of importance for experiments probing high lying excited states in dense alkali vapor.