Investigations on the production kinetics of ionic alkali–rare gas excimers

Mantel, M.; Schumann, M.; Giez, A.; Langhoff, H.; Hammer, W.; Petkau, K.

doi:10.1063/1.462969

Cited by 12 publications

(3 citation statements)

References 17 publications

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“…However, the height and the location of the potential minimum remains unchanged. 1 and are supplemented by results of a recent investigation [8]. The potential minimum for Kr+K is located at a larger radius R, than the one for the lower curve.…”

Section: Pacs: 3320nimentioning

confidence: 91%

Potential curves of the rare gas alkali ions

Mantel

Langhoff

1990

Z Phys D - Atoms, Molecules and Clusters

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Section: Pacs: 3320nimentioning

confidence: 91%

Potential curves of the rare gas alkali ions

Mantel

Langhoff

1990

Z Phys D - Atoms, Molecules and Clusters

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“…The transition probabilities were studied experimentally using the setup described in [15]. Ion pulses with a width of 50 ns were injected into a Kr/K-mixture.…”

Section: Pacsmentioning

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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“…3. In most experiments the total fluorescence output was recorded by galing the OSMA with a mspulse.…”

Section: Introductionmentioning

confidence: 99%

Kinetics and spectroscopy of alkali rare-gas ionic excimers

Delaporte

Fontaine

Sentís

et al. 2000

International Conference on Atomic and Molecular Pulsed Lasers III

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Many kinetic and spectroscopic studies were performed on alkali rare gas ionic excimer. The main results obtained during these investigations are presented. We observed fluorescence spectra from diatomic and triatomic molecules. Vacuum ultraviolet fluorescence emissions from alkali rare gas ionic excimer molecules were studied in detail by lowenergy electron beam excitation. Measurements were performed as a function of gas composition, gas pressure and deposited energy in order to investigate the kinetic mechanisms of these molecules. The rate constants of the formation and competitive reactions were determined from the observed fluorescence signal decay. Emissions of Ne-Xe-Cs mixtures excited by a pulsed electrical discharge were investigated experimentally as a function of gas pressure and gas composition. No fluorescence correlated to alkali rare gas molecules were observed. Triatomic ionic excimers have also been observed. These molecules have been produced by electron beam excitation. Emission spectra centered at -159nm due to Kr2Cs radiative decay were recorded. Binding energy of the lowest excited state is determined. Two formation channels for these triatomic ions are proposed and their rate coefficients estimated.Keywords: VUV, spectroscopy, kinetic, alkali, rare gas, electron beam, discharge ultraviolet fluorescence emissions from RgA molecules were studied in detail by lowenergy electron beam excitation. Emissions of Ne-Xe-Cs mixtures excited by a pulsed electrical discharge were also investigated experimentally and theoretically. Triatomic ionic excimers (Rg2A) have also been observed and studied. EXPERIMENTAL SETUPA detailed description of the experimental apparatus is given elsewhere'°. In this work only the main features of the set-up necessary for the interpretation of the experimental results are mentioned. The whole device consists of three main parts: The heated cell, the apparatus for the excitation of the gas mixtures in the cell and the optical detection system for spectral and time-resolved investigations on the emitted fluorescence spectra in the VIJV.'

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Investigations on the production kinetics of ionic alkali–rare gas excimers

Cited by 12 publications

References 17 publications

Potential curves of the rare gas alkali ions

Potential curves of the rare gas alkali ions

Ab-initio calculations of excited rare gas alkali ions

Kinetics and spectroscopy of alkali rare-gas ionic excimers

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