Cascade-fluorescence spectroscopy on impact-excited He-atoms using level-crossing techniques

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

doi:10.1007/bf01546429

Cited by 11 publications

(7 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particular, different cascade channels can not be sufficiently distinguished. The measurements of Wolf et al [1] performed recently in our laboratory yielded a lifetime of the 4 1F level in excellent agreement with the present result. Further, lifetimes and tensor polarizabilities of highly excited 1 snl levels of He I can be calculated fairly accurately using the Coulomb approximation.…”

Section: Discussion Of Resultssupporting

confidence: 94%

“…The contribution due to direct excitation of the I1 s 4f ~F) level is only slightly broadened. As outlined in [1] this broadening is proportional to g4. These magnetic depolarization signals have been fitted with the theoretical shape of a one-step cascade signal [1].…”

Section: A) Measurement Of the Radiative Lifetimes R(lsnf Xf)mentioning

confidence: 96%

“…The composition of the observed magnetic depolarization signals could be determined by analyzing the shape in dependence of the strength of an electric field applied parallel to the ion beam. The details of the procedure are discussed in [1]. Results for the 668 nm line at an impact energy of 16.7 keV and for the 492 nm line at an impact energy of 19.6 keV are given in Table 1.…”

Section: A) Measurement Of the Radiative Lifetimes R(lsnf Xf)mentioning

confidence: 99%

“…The tensor polarizability results -up to a small correction being less than 0.5% -from the electric dipole matrix element (ls, n l=n-1 []rll is, n /=n-2). Previously we measured on the one hand radiative lifetimes of Ils, n I=n-1 1L) levels (n=3,4,5) by analyzing magnetic depolarization signals of the 668 nm fluorescence line of He I impact-excited by 35keV Ne § ions [1], and on the other hand tensor polarizabilities of IlsndlD) levels (n=3, 4,5) …”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Radiative lifetimes and tensor polarizabilities of 1s4f 1 F and 1s5f 1 F level of He I

et al. 1981

Self Cite

View full text Add to dashboard Cite

He atoms have been excited by Ne § ion impact and the depolarization of the fluorescence lines at 668 nm and 492 nm by magnetic and electric fields has been studied. The Ne § ion energy could be chosen such that pure cascade level crossing signals were observed. From the widths of magnetic depolarization signals the radiative lifetimes z(ls4f 1F)=74(2) ns and r(ls5f 1F)= 133(5) ns have been determined. By investigating the electric field splitting of the magnetic depolarization signals the tensor polarizabilities Ic%n(ls 4f 1F)] = 0.58(1) kHz/(V/cm) 2 and ICqen(1S 5f ~f)l = 4.2(1) kHz/(V/cm) 2 have been deduced. From the latter value a mean frequency v(ls 5g-ls 5f)= 14.4 GHz of the transitions between the levels of the ls5f configuration and those of the ls5g configuration has been derived. ~ten(1S4f IF) depends sensitively on the singlet-triplet mixing in the ls4f configuration and thus a mixing coefficient could be deduced for this configuration.

show abstract

Section: Discussion Of Resultssupporting

confidence: 94%

Section: A) Measurement Of the Radiative Lifetimes R(lsnf Xf)mentioning

confidence: 96%

Section: A) Measurement Of the Radiative Lifetimes R(lsnf Xf)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Radiative lifetimes and tensor polarizabilities of 1s4f 1 F and 1s5f 1 F level of He I

et al. 1981

Self Cite

View full text Add to dashboard Cite

show abstract

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Proton-impact excitation of HeI triplet levels

Aynacioglu

Oppen

Müller

1987

Z Phys D - Atoms, Molecules and Clusters

View full text Add to dashboard Cite

Cascade-fluorescence spectroscopy on impact-excited He-atoms using level-crossing techniques

Cited by 11 publications

References 15 publications

Radiative lifetimes and tensor polarizabilities of 1s4f 1 F and 1s5f 1 F level of He I

Radiative lifetimes and tensor polarizabilities of 1s4f 1 F and 1s5f 1 F level of He I

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

Proton-impact excitation of HeI triplet levels

Contact Info

Product

Resources

About