Excitation of laser state-prepared Na*(3p) to Na*(3d) in low-energy collisions with Na+: experiment and calculations of the potential curves of Na2+

Bähring, A.; Hertel, I. V.; Meyer, Edmund; Meyer, Wolfgang; Spies, N; Schmidt, H.

doi:10.1088/0022-3700/17/14/015

Cited by 56 publications

(42 citation statements)

References 19 publications

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“…For intermediate distances R<9ao, these rotational couplings drop down by 30-50~, and the splitting in the 12p9, ~2) energy curves gives rise to a more rapid oscillation of the exponential function in (6) such that the population in BF varies more slowly. In our collision systems no locking radius [16,17,49] of the body-fixed population is seen. Even at the closest distance (R = b), where the ~2-splittings are largest, the (2-populations vary significantly 9…”

Section: A(t)=c(t)exp (-~ I E~(z)d~)mentioning

confidence: 65%

“…the dependence of observables on the polarization direction, constitutes a sensitive probe of the dynamic behaviour of the collision system. Clear polarization effects have been observed in differential rainbow scattering of Na(3p3/2 ) atoms [-7] and K(4p3/2 ) atoms [15] from Hg atoms and in superelastic [16] and inelastic [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] scattering of Na § ions from Na(3p3/2 ) atoms. In these cases, a narrow range of impact parameters in a well-defined collision plane is responsible for the polarization dependent intensity.…”

Section: Introductionmentioning

confidence: 99%

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Polarization effects in ionizing thermal energy collisions of laser-excited Ne(3p 3 D 3) atoms with Ar atoms

et al. 1985

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Using transverse and longitudinal excitation of a collimated metastable Ne(3s 3P2.o) beam with average velocities of 500, 800, and 1,200 m/s by means of a single mode dye laser on the 2~ 3P2~3 p 3D3) transition, we have investigated ionizing collisions of polarized Ne(3s 3p2) and Ne(3p 3D3) atoms with Ar atoms. The product electrons were energy analyzed with high resolution (9-25meV). The resulting Ne(3p 3D3) electron spectra exhibit a strong dependence on the three types of laser polarization (7~11,7~• chosen to prepare the excited atoms. In contrast, the Ne(3s 3P2) spectra are only weakly dependent on polarization. Detailed model calculations have been carried out for the Ne(3p)+ Ar cross sections, using computed excited-state potential curves, semi-empirical ionic potentials, and local autoionization width functions. A semiclassical closecoupling method is applied to describe the evolution of the polarized collision system in the coupled entrance channels. It is found that a single autoionization width F(R) is not sufficient to describe the measured polarization effects properly. The dependence of F on the initial and final state is expressed in terms of few reduced electronic transition matrix elements, which are determined by comparison of measured and calculated total cross sections and Ar+(2p3/2)/Ar+(2P1/2) branching ratios for ionizing collisions of the various Ne(3p J = 1, 2, 3) multiplet states with Ar. The matrix elements corresponding to Ar(3p a)~Ne(2pa) electron transfer during autoionization are found to dominate, but Ar(3pr0-*Ne(2prc) transfer has also to be included. The resulting calculated electron spectra reproduce the measured polarization effects in a semi-quantitative way.

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Section: A(t)=c(t)exp (-~ I E~(z)d~)mentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Polarization effects in ionizing thermal energy collisions of laser-excited Ne(3p 3 D 3) atoms with Ar atoms

et al. 1985

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“…Figure 2 reproduces the calculated potential energy curves Vj(R) from [7] for the molecular ion Na~. crossing (B) from [7] v R is the radial component of the relative velocity, 0 the angular velocity of the radius vector R and L• is the component of the orbital angular momentum perpendicular to the scattering plane. To integrate the coupled equations (5) one has to compute the classical trajectory R(t) for any given impact parameter b.…”

Section: V(r(t))mentioning

confidence: 72%

“…The molecular potentials 1 2S u, 2 2S,, 1 aHu and 2 2H u used in the calculations are taken from [7]. The nonadiabatic coupling elements originate from [12].…”

Section: V(r(t))mentioning

confidence: 99%

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Coherence effects in low energy Na*(3p)+Na+ scattering: Experiment and semiclassical calculations

Bähring¹,

Meyer

Hertel

et al. 1985

Z Physik A

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Pronounced polarization effects have been observed in inelastic collisions of laser stateprepared Na*(3p, Mc) with Na § leading to Na*(3d) for the energy range EcM=20-45 eV. Using linearly polarized light the dependence of the inelastic process on the alignment of the electronic charge cloud of the Na*(3p) prior to the collision has been measured. In studies with left and right hand circularly polarized light the angular momentum transferred in the collision process has been determined. The results are compared with similar data for the 3p--,3s deexitation process studied previously [6].The density matrix of the Na*(3p) state has been evaluated with respect to the collisional excitation to Na*(3d). Semiclassical calculations based on the coupled channel impact parameter approximation using pseudopotentials [7] and nonadiabatic rotational coupling elements for the Na* system [12] have been performed. The agreement with the experimental results is good, in particular for the higher collision energies.

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Symmetry and Angular Momentum in Collisions with Laser‐Excited Polarized Atoms

Campbell¹,

Schmidt²,

Hertel³

1988

Advances in Chemical Physics

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Excitation of laser state-prepared Na(3p) to Na(3d) in low-energy collisions with Na⁺: experiment and calculations of the potential curves of Na₂⁺

Cited by 56 publications

References 19 publications

Polarization effects in ionizing thermal energy collisions of laser-excited Ne(3p 3 D 3) atoms with Ar atoms

Polarization effects in ionizing thermal energy collisions of laser-excited Ne(3p 3 D 3) atoms with Ar atoms

Coherence effects in low energy Na*(3p)+Na+ scattering: Experiment and semiclassical calculations

Symmetry and Angular Momentum in Collisions with Laser‐Excited Polarized Atoms

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