Photon-scattered-atom coincidence study with vector polarisation analysis for the Li-inert-gas collisions

Menner, B; Hall, Th.; Zehnle, L; Kempter, V.

doi:10.1088/0022-3700/14/19/018

Cited by 18 publications

(15 citation statements)

References 20 publications

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“…For a number of quasi-one-electron systems ^/(R) possesses a maximum when the internuclear distance is about equal to the radius of the valence orbital. This behaviour has been observed for Mg +-He [10], Li -He [11], and Na-Ne [12]. A maximum of the rotational coupling (X[i.LylA) appears then at this distance, and a zero transition of the radial coupling …”

Section: Physical Modelsupporting

confidence: 52%

Theoretical study of the 3p-excitation in Mg+ and Mg0-inert gas collisions

Knöpfle

Kempter

1983

Z Physik A

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Excitation of the 3p-states of Mg + and Mg ~ colliding with inert gases is treated within the coupled-channel impact parameter approximation. We have calculated the total excitation cross section and the linear polarisation of the (3p~3s)-emission as a function of the collision energy as well as the impact parameter dependence of the excitation probability and of the excitation amplitudes (expressed in terms of the ,~,Zparameters). Qualitative agreement with the experiments can be obtained when including both localised molecular orbital transitions at small internuclear distances (mechanism (i)) and the direct interaction between the Mg+'~ electrons and the inert gas atom at large internuclear distances (mechanism (ii)). We present evidence that it is inadequate at impact energies below 1 keV to compute the phase X directly from the excitation amplitudes obtained in the coupled-channel impact parameter approximation.

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Section: Physical Modelsupporting

confidence: 52%

Theoretical study of the 3p-excitation in Mg+ and Mg0-inert gas collisions

Knöpfle

Kempter

1983

Z Physik A

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“…The scattering equipment has been described at several occasions ( [9] and references given therein). Briefly, a monoenergetic, well collimated alkali ion beam is directed into a scattering cell containing the inert gas at a pressure of typically 10-3 Torr.…”

Section: Apparatusmentioning

confidence: 99%

“…As compared to the detection system described in [9] the present one has two new features -variable angular resolution, and -the possibility to perform two-dimensional positionsensitive coincidence measurements.…”

Section: Multieoincidence Measurements With Position-sensitive Particmentioning

confidence: 99%

“…For a given beam energy and scattering angle the linear polarization P~, the alignment angle 7, the angular momentum expectation value L ±, and the degree of polarization IPI were derived in the usual manner [2] from the experimentally determined polarization vector (P~, P2, P3) of the light emitted perpendicular to the scattering plane: for Li(22 P) [9] and Cz =0.14 cl =0.56 for Na(32P).…”

Section: Data Evaluationmentioning

confidence: 99%

See 1 more Smart Citation

Orientation and alignment of alkalip-states excited in low-energy collisions of alkali ions with noble gas atoms

Menner

Ohlendorf

Patorra

et al. 1990

Z Phys D - Atoms, Molecules and Clusters

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Abstract. The orientation and alignment of Li(2p) excited in 1-2.5 keV Li + collisions with He and Ar, and of Na(3p) excited in 2.5keV Na ÷ collisions with He and Ne have been studied by the polarized photon-scattered particle coincidence technique. The covered range of scattering angles is between 1 and 18 degrees. The data are presented in terms of the alignment angle 7 and the transferred angular momentum LQ A qualitative analysis of the data is attempted on the basis of diabatic molecular orbital diagrams for the studied collisions systems.

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“…Based on this type of mechanism we will try to explain the impact parameter and energy dependence of the Mg--(3p)-excitation amplitudes. We have used the same model to understand the behavior of the amplitudes for excitation of Li(2p) in Li-Xe collisions [9].…”

Section: Introductionmentioning

confidence: 99%

Mg+(3p) excitation in slow Mg+?Ar collisions: Some remarks concerning the mechanism for Mg+(3p) excitation

et al. 1982

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The probability and the amplitudes (2,)~-parameters) for exciting the magnetic sublevels of Mg+(3p) in collisions with Ar-atoms have been computed within the coupledchannel impact parameter approximation. An excitation mechanism is found which accounts for most of the pecularities observed in the energy and impact parameter dependence of the 2,z-parameters for this collision system: the a3sMg + orbital acquires 3d-character at internuclear distances <1.8 a.u. and by strong rotational coupling among the 3d-molecular orbitals in this region primarily the 3dn MO becomes populated. The final distribution among the magnetic sublevels of Mg+(3p) is determined by the rotational coupling at intermediate and large internuclear distances (>3 a.u.) between the cr3p and ~3p magnetic substates of Mg+(3p).

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Photon-scattered-atom coincidence study with vector polarisation analysis for the Li-inert-gas collisions

Cited by 18 publications

References 20 publications

Theoretical study of the 3p-excitation in Mg+ and Mg0-inert gas collisions

Theoretical study of the 3p-excitation in Mg+ and Mg0-inert gas collisions

Orientation and alignment of alkalip-states excited in low-energy collisions of alkali ions with noble gas atoms

Mg+(3p) excitation in slow Mg+?Ar collisions: Some remarks concerning the mechanism for Mg+(3p) excitation

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