Fine-structure and tensor polarizabilities of 1snd 3 D levels of He I (n=3 to 7)

Perschmann, W. D.; Oppen, Gebhard von; Szostak, D.

doi:10.1007/bf01411606

Cited by 15 publications

(5 citation statements)

References 21 publications

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“…A lot of suitable level-crossing signals have been registered recently in our laboratory in connection with fine-structure investigations on He 1 [1]. With regard to the 35keV-He---He collisions investigated here we confirm the spin-independence of the excitation matrix as expected.…”

Section: Introductionsupporting

confidence: 83%

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Analysis of level-crossing signals after impact excitation of 1snd 3 D levels of He I by He+-He collision

1984

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Level-crossing signals of impact radiation of He I have been analyzed with regard to the determination of excitation matrices. The signals have been registered at various electricfield strengths by sweeping a magnetic field strength ~ through the positions of Am =2 crossings of Zeeman substates of n3D2 and n3D3 levels (n=4 and 5) of He I excited by 35 keV-He § collisions. We analyzed the signal amplitudes and signal shapes with regard to a spin-dependence of the excitation matrix usually discarded by theoretical arguments. To this end a parametrization of spin-dependent excitation matrices has been performed, and the dependence of the level-crossing amplitudes on the 19 parameters obtained have been studied. It turned out that the observed relative signal amplitudes can satisfactorily be explained by only two parameters, the two multipole components of order k=2 and k--4 of the alignment of the orbital angular momentum. Thus in agreement with theoretical estimations no spin-dependence must be taken into account.

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Section: Introductionsupporting

confidence: 83%

“…In our laboratory we used ion-impact excitation in order to measure various spectroscopic parameters like fine-structure splittings [1], tensor polarizabilities [2] and radiative lifetimes [3] of lsnI levels of HeI.…”

Section: Introductionmentioning

confidence: 99%

Analysis of level-crossing signals after impact excitation of 1snd 3 D levels of He I by He+-He collision

1984

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“…According to these formulae, also numerical evaluations of the energy separation were performed where intershell mixing of 1s3p and 1snl states with n 8 was taken into account. The results did not differ significantly from the value given in (15). Therefore, we conclude from the experimental result that the assumption of J independent polarizabilities cannot be maintained and that the scalar polarizabilities of the 3 3 P 2 and 3 3 P 0 level differ by about 1 kHz (kV cm −1 ) −2 .…”

Section: Resultssupporting

confidence: 43%

“…can be evaluated from the zero-field fine structure splittings ν 20 and ν 31 of the 3 3 P and 3 3 D level, respectively, and the interconfiguration matrix element [14] h ss off = 1s3s 3 S 1 |H ss |1s3d 3 D 1 /h (14) of the spin-spin coupling H ss . With ν 20 as given above and ν 31 = 1400.7(4) MHz [15], one finds: ν min = 8246 MHz − 0.0015h ss off .…”

Section: Higher-order Correctionsmentioning

confidence: 90%

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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“…Some experiments by means of classical emission spectroscopy were performed at our institute for He and Ar lines [14,15]. Later on, crossed fields were already used in level-anticrossing spectroscopy [16] in order to separate overlapping crossing points. By means of laser spectroscopy, the influence of crossed fields on Rydberg states were studied in detail [17].…”

Section: Introductionmentioning

confidence: 99%

The sodium D2-line in electric and magnetic fields

Windholz

Musso

1994

Z Phys D - Atoms, Molecules and Clusters

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Abstract. The influence of perpendicularly crossed electric and magnetic fields of comparable strength on the hyperfine components of the sodium Dz-line was studied by means of laser-atomic-beam spectroscopy. The observed spectra show changes in the polarization type (a, re) when one of the fields becomes dominant relative to the other. Theoretical calculations confirm the experimental observations.

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Fine-structure and tensor polarizabilities of 1snd 3 D levels of He I (n=3 to 7)

Cited by 15 publications

References 21 publications

Analysis of level-crossing signals after impact excitation of 1snd 3 D levels of He I by He+-He collision

Analysis of level-crossing signals after impact excitation of 1snd 3 D levels of He I by He+-He collision

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

The sodium D2-line in electric and magnetic fields

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