VUV-transitions in ionic rare-gas alkali molecules

Fiedler, Jan; Frey, L.; Steigerwald, Frank; Langhoff, H.; Griegel, T.; Petkau, K.; Hammer, W.

doi:10.1007/bf01444430

Cited by 25 publications

(11 citation statements)

References 9 publications

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“…The coaxial electron beam has a particle energy of 500 keV, a peak current of 5 kA, a beam diameter of 2 cm, and a triangular-shape pulse duration of 3 ns. The spectrum shape and band width, however, is somewhat different to the previous observed by ion beam pumping [5]. The active length of the cell is 45 cm.…”

Section: Methodscontrasting

confidence: 57%

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Relativistic e-beam pumping of rare-gas-alkali ionic excimers

Xing

Tan

1998

SPIE Proceedings

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Bound-free vacuum uv emissions were observed from electron-beam-pumped gas mixtures of Xe or Kr with hot alkali vapors. The observed four emission bands were assigned to the 21 .+1 or 11 II 11 + transitions of the Xe+Cs, KrCs, XeLi, and KrLi ionic excimers. Keywords: ionic excimers, Bound-free vacuum uv emissions, electron-beam-pumped, rare-gas alkali SPIE Vol. 3549 • 0277-786X/98/$1 0.00 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/21/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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Section: Methodscontrasting

confidence: 57%

“…Xe* Cs Rg-XeCs Rg (1) Xe Cs Rg -XeCs Rg (2) Xe2 Cs -XeCs + Xe (4) Xe+Cs Cs -' Xe* Cs+ Cs (5) XeCs -* Xe + + hV (6) where Rg is Xe or other buffer gases. The upper active state of Xe+Cs is populated by processes (1) -(3).…”

Section: Resultsmentioning

confidence: 99%

Relativistic e-beam pumping of rare-gas-alkali ionic excimers

Xing

Tan

1998

SPIE Proceedings

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“…In recent experimental investigations [1,2,3,4] it was shown that the ions decay by emission of radiation in the vacuum ultra violet region. Because of the weak bonding of the ground state these ions behave excimer-like and are potential candidates for lasers in the VUV.…”

Section: Pacs: 3120ejmentioning

confidence: 99%

Ab-initio calculations of excited rare gas alkali ions

Markert

Das

Mantel

et al. 1994

Z Phys D - Atoms, Molecules and Clusters

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Abstract. The excimer-like ions formed by combining a rare gas ion with an alkali atom were investigated by an ab initio HF-CI calculation. The resulting four bound excited states 1S+, JII, 322+ and 3H were subjected to a semiempirical spin orbit (SO)-coupling yielding eight fine structure levels with angular momenta 12=2, 1 (3) and 0(4). For (NeLi) +, (NeNa) +, (ArLi) +, (arNa) ÷, (ARK) ÷ and (KrLi) ÷ the wavelengths for the five allowed transitions to the ground state were calculated. The results are in close agreement with the experimental results. Also other spectroscopic properties as binding energies, transition moments and vibrational quanta are given. PACS: 31.20.EjDiatomic ions Rg+A formed by combining a rare gas ion (Rg +) with an alkali atom (A) are of great interest, since they decay radiatively into the weakly bound ground state Rg A + formed by an alkali ion and a rare gas atom. In recent experimental investigations [1,2,3,4] it was shown that the ions decay by emission of radiation in the vacuum ultra violet region. Because of the weak bonding of the ground state these ions behave excimer-like and are potential candidates for lasers in the VUV.The observed transitions from the Rg+A ions with Rg = Ar, Kr or Xe and A = Li, Na, K, Rb, or Cs showed a fine structure [3]. In order to clarify its origin, in the present investigation the binding properties of some Rg + A ions were studied by ab-initio calculations.The binding of the Rg + A ions results from the polarizing action of the Rg + ion on the alkali atom. In most cases the asymptotic states Rg + (2P3/2, ZP1/2) + A (2S1/2) form the first excited states of the (Rg + A)* system. In a close vicinity the states Rg (3P0,1, 2, 1P1 )+ A (1S 0) + states are located. The resulting bound states of the molecular ions have 1'32; or 1'3H character leading to a total of eight fine structure levels with angular momenta of f2 = 2(1), 1(3), 0-(2) and 0+(2).Conceptually, the problem has been investigated in several steps. As a starting point serves a Hartree-Fock selfconsistent field (HF-SCF) method based on the assumption that each electron moves in an effective field provided by the nuclei and the whole electron distribution. An improvement to the energy due to non-dynamical correlation effects, which account for the degeneracy between different configurations and a rearrangement of electrons in partially filled shells, has been achieved by adding extra configurations to the HF reference state.

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“…In a recent paper [1] it was shown that the rare gas ions and the alkali atoms form bound states Rg+A which decay by emission of radiation in the VUV into the weakly bound states RgA ÷. I4 compounds of the type Rg+A decaying between 131nm and 190 nm were synthetisized.…”

Section: Pacs: 3320nimentioning

confidence: 99%

“…The lower potential curve, U1 (R), representing KrK + was taken from Viehland [-7]. Taking U1 (Ru) instead of D1 as in the former estimate [1] is of minor importance for the ions which contain the heavy alka- The lower potential curve was calculated by Viehland [7]. Therefore, the radiative transition of energy hv ends in a vibrationally excited state, hv is given by hv=IRg--I A --Du + [/1 (R,), whereas I is the ionisation energy and Du the dissociation energy of the upper level.…”

Section: Pacs: 3320nimentioning

confidence: 99%