Experimental investigation of atoms in crossed electric and magnetic fields

Connerade, J P; Hogan, S. D.; Abdulla, A. M.

doi:10.1088/0953-4075/38/2/011

Cited by 19 publications

(15 citation statements)

References 13 publications

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“…In the present paper, we report a new set of calculations, which are based on similar principles, and we compare them both with earlier theoretical work and with the experimental data. We also note that recent experiments by Connerade and co-workers have led to new data on diamagnetic Stark spectra [9,10]. In absence of electric fields, however, the system possesses rotational symmetry.…”

Section: Introductionmentioning

confidence: 59%

Diamagnetic Spectra of Alkaline Earth Barium in a Magnetic Field

Meng¹

2011

JAMS

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We present theoretical diamagnetic spectra of Barium using R-matrix method combined with quantum defect theory. The nonhydrogenic character of the spectra is analyzed for Ba. Comparisons are made with similar calculations for hydrogen and with data of experiments in the l-mixing region and n-mixing region. The result shows that the theoretical results are in good agreement with the experimental ones.

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Section: Introductionmentioning

confidence: 59%

Diamagnetic Spectra of Alkaline Earth Barium in a Magnetic Field

Meng¹

2011

JAMS

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“…1 As the magnetic field becomes higher, the Lorentz force becomes competitive with the Coulomb binding force. [7][8][9][10][11][12][13] At present, experiments for both the quadratic Zeeman effect 14,15 and the Landau levels 16,17 continue to be reported, and they extend to resonances in coexisting high magnetic and high electric fields, 18,19 which are interpreted as quantum chaos. This condition is satisfied at lower field, when the energy level is higher.…”

Section: Introductionmentioning

confidence: 99%

Experimental setup for laser spectroscopy of molecules in a high magnetic field

Takazawa

2011

Review of Scientific Instruments

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An experimental setup to measure the effects of a high magnetic field on the structure and decay dynamics of molecules is designed and constructed. A vacuum chamber is mounted in the bore of a superconducting magnet. A molecular beam passes in the chamber. Pulsed laser light excites the molecules in the field. The parent or fragment ions are extracted by an electric field parallel to the magnetic field. They are detected by a microchannel plate. Their mass and charge are determined by the time-of-flight method. The performance of the setup was examined using resonance-enhanced two-photon ionization through the X(2) Π-A(2)Σ(+) transition of nitric oxide (NO) molecules. The ions were detected with sufficient mass resolution to discriminate the species in a field of up to 10 T. This is the first experiment to succeed in the mass-selective detection of ions by the time-of-flight method in a high magnetic field. By measuring NO(+) ion current as a function of the laser frequency, the X(2)Π-A(2) Σ(+) rotational transition lines, separated clearly from the background noise, were observed in fields of up to 10 T. From the relative strengths of the transition lines, the ion detection efficiency was determined as a function of the magnetic field strength. This setup was shown to be applicable in a field higher than 10 T. The Landau levels of molecules were successfully observed to demonstrate the setup.

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“…The barium atom is studied extensively because it has two valence electrons, which makes it one of the best candidates to investigate electron correlations. [12][13][14][15][16] An added benefit for the barium atom concerns its quantum defect for the np channel, being very small or nearly zero. Its diamagnetic spectrum is thus analogous to that of hydrogen for one-photon excitation to np states as the selection rules L = L±2 prohibits intrusions from the neighboring ns and nd states, both of which possess considerable quantum defects.…”

Section: Introductionmentioning

confidence: 99%

An effective quantum defect theory for the diamagnetic spectrum of a barium Rydberg atom

Liu

2013

Chinese Phys. B

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A theoretical calculation is carried out to investigate the spectrum of a barium Rydberg atom in an external magnetic field. Using an effective approach incorporating quantum defect into the centrifugal term in the Hamiltonian, we reexamine the reported spectrum of the barium Rydberg atom in a magnetic field of 2.89 T [J. Phys. B 28 L537 (1995)]. Our calculation employs B-spline basis expansion and complex coordinate rotation techniques. For single photon absorption from the ground 6s 2 to 6snp Rydberg states, the spectrum is not influenced by quantum defects of channels ns and nd. The calculation is in agreement with the experimental observations until the energy reaches E = −60 cm −1 . Beyond this energy, closer to the threshold, the calculated and experimental results do not agree with each other. Possible reasons for their discrepancies are discussed. Our study affirms an energy range where the diamagnetic spectrum of the barium atom can be explained thoroughly using a hydrogen model potential.

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Experimental investigation of atoms in crossed electric and magnetic fields

Cited by 19 publications

References 13 publications

Diamagnetic Spectra of Alkaline Earth Barium in a Magnetic Field

Diamagnetic Spectra of Alkaline Earth Barium in a Magnetic Field

Experimental setup for laser spectroscopy of molecules in a high magnetic field

An effective quantum defect theory for the diamagnetic spectrum of a barium Rydberg atom

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