Collision spectroscopy with aligned and oriented atoms. VI. A complete density matrix determination for the H⁺+Na(3p) to H(n=2)+Na⁺process

Abstract

For pt.V see ibid., vol.24, no.8, p.L213-8 (1991). The complete density matrix describing the charge transfer process H++Na(3s or 3p) to H(n=2)+Na+ has been measured for scattering angles theta (0.2' and an H+ energy of 1 keV. At this energy the collision velocity is about half the mean velocity of the Na(3p) valence electron. Pronounced right-left scattering asymmetries has been observed both for initially oriented as well as for aligned Na(3p) states. Very good agreement is found with recent elaborate theoretical results of Dubois et al. (1993). Measurements at 0.75 keV and 2 keV show similar trends. The findings are discussed in terms of simple models such as velocity matching and propensity rules for orientation.

Orientation and alignment in charge exchange processes involving sodium atoms studied by semi-classical molecular theory

“…The measurements [4,5] of the DCS for the initial Na 3 p -1 state are reported at v = 0.2 a.u. on Fig.…”

“…The measurements of the DCS [5] for the initial aligned Na 3 p 45 ° state are compared on the Fig. 2a to the calculations convoluted as in Fig.…”

“…Measurements of the alignment effect on total cross sections for electron capture into H (n = 2) and H (n => 3) were performed [ 1,2]. The role of the orientation of the initial Na (3 p) orbital can be analysed only through an angular analysis of the scattered H atoms [3][4][5]. Complementary information is provided by other experiments [6][7][8][9] where the Ly= photons emitted by H (2p) atoms after charge exchange are detected.…”

Polarisation effects in electron transfer reactions with laser excited Na(3P) at medium energies

“…comparable with the mean velocity of the Na(3p) valence electron v e = 0.46 a.u. Strong anisotropy effects have been observed in angular differential scattering related with the initial alignment and/or orientation of the Na(3p) state [1,3]. We now examine other simple systems in order to explore further the general character of the observed anisotropy effects and to investigate to which extent the predictions of "simple" models like propensity rules for orientation in charge exchange [4] or velocitymatching [5] are valid.…”

“…The charge transfer process H ++Na(3p)-,H*(n=2)+Na +; AE=0.36eV (I) where the Na(3p) target is prepared in a well defined quantum state by laser irradiation has been investigated with a complete set of polarisations of the laser light [ 1,2] in the collision velocity range 0.1 < V~ < 0.28 a.u. comparable with the mean velocity of the Na(3p) valence electron v e = 0.46 a.u.…”