Level-crossing investigation of electric-field anticrossings of He I

Reusch, O; Oppen, Gebhard von

doi:10.1088/0953-4075/29/9/014

Cited by 3 publications

(6 citation statements)

References 10 publications

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“…The frequency separations ν X of the 1s5d, f 1 × 3 and 1 × 3 anticrossings were measured earlier using level-crossing techniques [11]. The results are also shown in table 1 and are in good agreement with the rf measurements.…”

Section: Measurements and Resultssupporting

confidence: 79%

“…In the case of the 1 × 3 anticrossing (C ) of the 1s5f configuration the width F X is extremely small and, therefore, an adiabatic passage into the centre-field region could not be realized. However, ν X (1s5f 1 × 3 ) was measured earlier using level-crossing techniques [11]. Finally, the frequency separation of the 1s4d 1 × 3 anticrossing (B) was not measured, because it was outside the frequency range of the available synthesizer.…”

Section: Measurements and Resultsmentioning

confidence: 99%

“…Calculated parameters F X , F X and E X of the 1s4 (part a) and 1s5 (part b) singlettriplet anticrossings. In the end columns the measured resonance frequencies ν rf X (this paper) and ν lc X [11] at the electric-field position F X of the respective anticrossings are given.…”

Section: Singlet-triplet Anticrossings Of the 1s4 And 1s5 Configurationsmentioning

confidence: 99%

“…Due to the Stark mixing of states with different orbital angular momenta , as well as h off of the 1sn configurations with 2, h off of the 1snp configurations can also be deduced from the energy separations E min . First measurements of energy separations at electricfield anticrossings have been performed using laser spectroscopy [9,10] and level-crossing techniques [11]. Both techniques are afflicted by deficiencies.…”

Section: Introductionmentioning

confidence: 99%

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Precision measurements of electric-field 1snℓ singlet-triplet anticrossings of HeIusing radio frequency spectroscopy

Reusch

Dieste

Garnica

et al. 2001

J. Phys. B: At. Mol. Opt. Phys.

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The energy separations of closest approach were measured for the 1sn 1 × 3 anticrossings of singlet and triplet Stark states of the 1s4d, 1s5d and 1s5f configurations of He I. Using a fast atomic He beam, a selective population of the upper state of the anticrossing was accomplished by starting with an initial selective excitation of singlet states by 12 keV He-He collisions followed by an adiabatic transit to the electric field of the anticrossing, where radiofrequency transitions were induced. From the resonance signals the energy separations of three 1s4d, four 1s5d and three 1s5f anticrossings were determined. We evaluated the off-diagonal matrix elements of the spin-orbit coupling for the 1s4 and 1s5 configurations from the measured energy separations. The experimental results are compared with the calculated values.

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Section: Measurements and Resultssupporting

confidence: 79%

Section: Measurements and Resultsmentioning

confidence: 99%

Section: Singlet-triplet Anticrossings Of the 1s4 And 1s5 Configurationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Precision measurements of electric-field 1snℓ singlet-triplet anticrossings of HeIusing radio frequency spectroscopy

Reusch

Dieste

Garnica

et al. 2001

J. Phys. B: At. Mol. Opt. Phys.

Self Cite

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“…Besides zero-field energy separations, also the splitting of levels in external electric or magnetic fields is of interest for a detailed analysis of this fundamental quantum object. Most attractive for high-precision measurements are energy separations at anticrossings [5,6] where the separation of a pair of sublevels has a minimum and, therefore, is independent of the electric-field strength in first order. Considering the electric-field splitting of He I-1snl levels, there are anticrossings of singlet and triplet states of the 1snl configurations with l 2 at electric fields F 100 kV cm −1 [7].…”

Section: Introductionmentioning

confidence: 99%

Laser spectroscopy on the Stark effect of the level of He I

Schumann

Dammasch

Eichmann

et al. 1997

J. Phys. B: At. Mol. Opt. Phys.

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In electric fields 0 F 160 kV cm −1 , shift and splitting of the λ(1s2s 3 S-1s3p 3 P) = 389 nm line of He I were measured spectroscopically by crossing a beam of metastable He atoms with a frequency-doubled cw Ti:sapphire laser beam. We deduced the difference α sc = α sc (3 3 P) − α sc (2 3 S) = 4.20(3) MHz (kV cm −1 ) −2 of the scalar polarizabilities, the tensor polarizability α ten (3 3 P) = 84.0(7) kHz (kV cm −1 ) −2 and the energy separation of closest approach hν min = E(3 3 P 0 , 0 − ) − E(3 3 P 2 , 0 − ) = 8257(5) MHz • h of the Stark sublevels with m = 0 and negative reflection parity at F = 154(3) kV cm −1 . The polarizabilities agree with calculated values. By comparing the measured energy separation with theory, we deduced that the scalar polarizabilities of the 3 P 2 and 3 P 0 differ slightly by {α sc ( 3 P 2 ) − α sc ( 3 P 0 )}/α sc ( 3 P) = (1.8 ± 1.2) × 10 −4 .

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Higher-order Stark effect on an excited helium atom

et al. 1999

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Degenerate perturbation theory is used to study dipole susceptibilities of an excited helium atom in an external electric field. The dependence of the perturbed energy of levels in atoms on fine-structure effects and on the higher-order Stark effect is investigated. Numerical results have been obtained for the (1s3p) 3 P 0 and (1s3p) 3 P 2 states of helium. The magnitude of the electric field and the energy separation at the 0 Ϫ ϫ0 Ϫ anticrossing are calculated. Calculations of polarizabilities and hyperpolarizabilities are carried out using sums of oscillator strengths and, alternatively, with the excited electron Green function. An estimate is given based on the model potential method for the contribution of an infinite series over the bound states, including the integral over the continuum, for second-and higher-order matrix elements. The relativistic approach for evaluating reduced dipole matrix elements based on the relativistic no-pair Hamiltonian and including both the Coulomb and Breit interactions ͑configuration-interaction method͒ is analyzed.

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Level-crossing investigation of electric-field anticrossings of He I

Cited by 3 publications

References 10 publications

Precision measurements of electric-field 1snℓ singlet-triplet anticrossings of HeIusing radio frequency spectroscopy

Precision measurements of electric-field 1snℓ singlet-triplet anticrossings of HeIusing radio frequency spectroscopy

Laser spectroscopy on the Stark effect of the level of He I

Higher-order Stark effect on an excited helium atom

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