Doubly excited states in the beam-foil Li spectrum

Schlagheck, W.; Schürmann, D.; Haas, D.; Buttlar, H. v.

doi:10.1016/0375-9601(73)90695-6

Cited by 7 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the 2s2p 3P0-2p2 3P transition Ho obtained a wavelength of 5588 A, which is very close to earlier calculations by Doyle et al [45] and Bhatia [47]. Both Berry et al [48] and Schlagheck et al [49] Optical emission lines from doubly-excited singlet states have so far not been reported. Carroll and Kennedy [50] observed, however, ls2 'S-2s2p 'Po transitions in absorption.…”

Section: Lissupporting

confidence: 86%

Optical studies of multiply excited states

Mannervik¹

1989

Phys. Scr.

View full text Add to dashboard Cite

Optical studies of multiply-excited states are reviewed with emphasis on emission spectroscopy. From optical measurements, properties such as excitation energies, lifetimes and autoionization widths can be determined with high accuracy, which constitutes a challenge for modern computational methods. This article mainly covers work on two-, three- and four-electron systems, but also sodium-like quartet systems. Furthermore, some comments are given on bound multiply-excited states in negative ions. Fine structure effects on transition wavelengths and lifetimes (autoionization) are discussed. In particular, the most recent experimental and theoretical studies of multiply-excited states are covered. Some remaining problems, which require further attention, are discussed in more detail.

show abstract

Section: Lissupporting

confidence: 86%

Optical studies of multiply excited states

Mannervik¹

1989

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…Even if the broadening of the 2640 A line seems to be somewhat less than that of 3144A, it should not be excluded that these two transitions should have a common lower level. This is also the conclusion in the work by Jauregui and Bunge [ 38,391. However, they change the identification from that given earlier [ 25,26,36]. Jauregui and Bunge give the assignment ls2p' 'D-( 1 ~2 p ) ~P 3 d 'Do for the 3144A line and ls2p' 'D-(ls2p) 3P4d ' 0 ' for 26408.…”

mentioning

confidence: 92%

Lifetimes of Doubly-Excited Levels in Neutral Lithium

Mannervik¹

1980

Phys. Scr.

View full text Add to dashboard Cite

belonging to the doubly-excited systems of lithium. Almost every transition, which has been classified as a transition Lifetime measurements using the beam-foil technique have been performed for doublyexcited states in lithium. Decay curves for almost between doubly-excited states has been recorded. In some cases every transition known to belong to the doublyexcited system have lifetimes have been determined for the first time. The new been recorded. The measurements confim the assignments of tran-measurements will lead to a better understanding of the quartet sitions from the 2p3s 4P0, 2p3d 4D0 and 2p4d 4D0 levels. To determine and doublet systems of Li 1.the lifetime for the 2s3s 4S level it was necessary to perform a cascade subtraction, since it was found that the exponential corresponding to the primary decay was cancelled due to the cascading. The lifetimes 2. Experimental obtained for the low-lying levels 2s3s4S, 2p2 4P and 2s3d4D are in very good agreement with theory. The lifetime measurements are used The 400 kV heavy ion accelerator of the Research Institute of for discussion of assignments of transitions in the quartet and doublet physics was used to accelerate Li+ ions to energies between 60 keV and 300 keV. The ion source was loaded with LiCl and level scheme of Li I. a current of 3-4 p A was obtained through the 4 mm diameter

show abstract

“…For the lifetime of the 5 3S state, Gaillard et al obtained a value of (12.6_+0.9)ns which does not agree with the theoretical value of 9.7 ns computed from the transition probabilities of the decays 5 38--+2 3p, 5 33--*3 3p, and 5 3S--*4 3p, [13]. Another measurement [17] of the 5 3S lifetime using the transition 53S--.33p yields a value of (9.9_+ 0.3) ns. Nearly all lifetime data published previously are extracted from transitions of the form nL-+3E (n > 3).…”

Section: Lifetimesmentioning

confidence: 87%

Atomic states of lithium by the beam-foil technique in the spectral range 400?1900 �

Schürmann

1975

Z Physik A

View full text Add to dashboard Cite

Abstract. 6Li+-ions accelerated electrostatically to energies of 200-390keV are electronically excited by the beam-foil technique. The emitted light is analyzed with a SeyaNamioka VUV monochromator in the wavelength range 400-1900A. All Li II and Li III lines known from theory-in one case emitted by a n =9 level-are detected, several of them for the first time. Lifetimes of 20 Li II levels, some not measured previously, are determined after correction for cascades. The accuracy of the experimental values for several lifetimes is better than that of theoretical predictions.

show abstract

Doubly excited states in the beam-foil Li spectrum

Cited by 7 publications

References 3 publications

Optical studies of multiply excited states

Optical studies of multiply excited states

Lifetimes of Doubly-Excited Levels in Neutral Lithium

Atomic states of lithium by the beam-foil technique in the spectral range 400?1900 �

Contact Info

Product

Resources

About