Investigation of fine-structure quantum beats in sodium Rydberg atoms by field ionization

Jeys, T. H.; Smith, K. A.; Dunning, F. B.; Stebbings, R. F.

doi:10.1103/physreva.23.3065

Cited by 29 publications

(13 citation statements)

References 5 publications

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“…Leuchs and Walther [5] have investigated the nd intervals for n =21-31, and Jeys et at. [18] have measured nd fine structure of selected levels between n=32 and 40. Both sets of results, obtained by quantum-beat spectroscopy, are compared with our results in Fig.…”

Section: B Estimation Of the Stray Fieldmentioning

confidence: 99%

Microwave measurements ofd-f-g-hintervals anddandffine structure of sodium Rydberg states

Sun

MacAdam

1994

Phys. Rev. A

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Eighty-one microwave resonances in Na Rydberg states n =21-35 between d, f, g, and h states have been accurately measured. Among them 43 transitions are first-time measurements, and 38 transitions have been improved, primarily by the elimination of stray electric and magnetic fields, compared with previous measurements.For the d ftra-nsitions, the measured intervals and d-state fine-structure splittings are a factor of 10 more precise; for d-g and d-h series, the measured intervals are a factor of 3 more precise than before. The n f-state fine-structure splittings in Na for n =21-29 have also been accurately measured, and the conclusion that the Na f-state fine-structure splitting n f5/ 2 n f7/ 5 is about 5% smaller than the hydrogen f-state fine-structure interval is confirmed through n =29. PACS number(s): 32.30.Bv, 32.80.Rm, 32.60.+i, 35.80.+s

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Section: B Estimation Of the Stray Fieldmentioning

confidence: 99%

Microwave measurements ofd-f-g-hintervals anddandffine structure of sodium Rydberg states

Sun

MacAdam

1994

Phys. Rev. A

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“…They attributed the quantum beat signal to the interference of the multiple paths through the avoided crossings by which the electron could arrive at the detector. Jeys et al used quantum beat measurements to explore the behavior of finestructure superposition states as they evolved from low field to the ionization field [35]. We observe similar quantum , |m j | = 1/2 (red), the 37d 5/2 , |m j | = 3/2 (blue), and 37d 5/2 , |m j | = 5/2 (green) states.…”

Section: Introductionmentioning

confidence: 68%

Quantum interference in the field ionization of Rydberg atoms

et al. 2015

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We excite ultracold rubidium atoms in a magneto-optical trap to a coherent superposition of the three |m j | sublevels of the 37d 5/2 Rydberg state. After some delay, during which the relative phases of the superposition components can evolve, we apply an electric field pulse to ionize the Rydberg electron and send it to a detector. The electron traverses many avoided crossings in the Stark levels as it ionizes. The net effect of the transitions at these crossings is to mix the amplitudes of the initial superposition into the same final states at ionization. Similar to a Mach-Zehnder interferometer, the three initial superposition components have multiple paths by which they can arrive at ionization and, since the phases of those paths differ, we observe quantum beats as a function of the delay time between excitation and initiation of the ionization pulse. We present a fully quantum-mechanical calculation of the electron's path to ionization and the resulting interference pattern.

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“…We attribute those oscillations to field ionization of H(HR) states, even though we cannot assign the observed beat frequency to energy differences between specific energy levels of hydrogen atoms. Our experiment is very different from those used in refs − , which combined laser excitation of Na or Rb atoms with field ionization. Laser excitation could create coherently populated states before field ionization.…”

Section: Resultsmentioning

confidence: 91%

“…The reader is referred to their study for the details of the mechanism. The cited studies − , deal with quantum beats observed in electron detection. However, the same mechanism is also valid for quantum beats observed in ion detection because field ionization of a hydrogen atom in an HR state produces simultaneously a free electron and a proton.…”

Section: Resultsmentioning

confidence: 99%

“…A quantum beat signal was observed in the number of field electrons when the time delay between excitation and ionization was varied. In another study of highly excited sodium n D states, Jeys et al 13 varied the slew rates and strengths of the electric fields in their experiment and could elucidate the physics of quantum beats observed in field ionization. More recently, Feynman et al 14 have studied quantum beats in field ionization of high-Rydberg Rb atoms and presented fully quantum mechanical calculations of the electron’s path to ionization.…”

Section: Introductionmentioning

confidence: 99%

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Soft X-ray Induced Production of Neutral Fragments in High-Rydberg States at the O 1s Ionization Threshold of the Water Molecule

2021

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Dissociation of water molecules after soft X-ray absorption can yield neutral fragments in high-Rydberg (HR) states. We have studied the production of such fragments by field ionization and ion time-of-flight (TOF) spectrometry. Neutral HR fragments are created at all resonances below the O 1s ionization potential (IP) and particularly within 1 eV above the O 1s IP. The latter effect is due to the recapture of the O 1s photoelectrons into HR orbitals of the molecular water ion after the emission of a fast Auger electron. H 2 O + (HR) fragments subsequently dissociate, yielding neutral H(HR) and O(HR) fragments, as were found by measuring the TOF spectra by pulsed field ionization. Such measurements were carried out at the O 1s → 4a 1 and 2b 2 resonances as well as just above the O 1s IP. The TOF spectra also reveal two series of oscillatory structures that are attributed to quantum beats involving Lyman emission in one of the series and field ionization of H(HR) fragments in the other series.

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Investigation of fine-structure quantum beats in sodium Rydberg atoms by field ionization

Cited by 29 publications

References 5 publications

Microwave measurements ofd-f-g-hintervals anddandffine structure of sodium Rydberg states

Microwave measurements ofd-f-g-hintervals anddandffine structure of sodium Rydberg states

Quantum interference in the field ionization of Rydberg atoms

Soft X-ray Induced Production of Neutral Fragments in High-Rydberg States at the O 1s Ionization Threshold of the Water Molecule

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