Selective valence electron transfer in alkali atom-alkali ion collisions

Bartschat, Klaus; Andrä, H. J.; Blum, K.

doi:10.1007/bf01412920

Cited by 6 publications

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“…Depolarization effects can be treated with the formalism of ''generalized perturbation coefficients'' using coupled state multipoles for three systems: N, S, and I [25,26]. In H 2 and D 2 , Hund's case (b) coupling is a reasonable starting point, since N ¼ Ã þ R (where Ã is the projection of the electronic orbital angular momentum on the internuclear axis and R is the nuclear rotational angular momentum) is a good quantum number.…”

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Threshold Alignment Reversal and Circularly Polarized Fluorescence in Rotationally ResolvedH2

Maseberg

Bartschat

2013

Phys. Rev. Lett.

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Using H2 and D2 targets, we have measured the polarization of Fulcher-band fluorescence resulting from spin-polarized electron-impact excitation of vibrationally and rotationally resolved d 3Π(u) → a 3Σ(g)+ transitions for incident electron energies from 14.3 to 28.5 eV. Near threshold, the linear polarization P1 descends from positive values through zero to negative values, indicating a dynamic production of M(N)=0 states. The circular polarization P3 is measured to be nonzero, indicating the orientation of rotationally resolved molecular states. For Q-branch transitions, P3 is consistent with theory based on Hund's case (b) coupling. The R-branch P3 values do not agree with theory equally well, indicating the effect of Σ-symmetry perturbation of the parent d 3Π(u)+ state.

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“…The time-averaged multipole moments of the excited molecular system are expressed as [25] hT þ KQ ðNÞi ¼…”

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confidence: 99%