Journal article

Publication year: 1995

Pages: 3271-3282

Journal: Journal of Physics B: Atomic, Molecular and Optical Physics

Volume number: 28

Issue number: 15

ISSN: 0953-4075

eISSN: 1361-6455

DOI Link: https://doi.org/10.1088/0953-4075/28/15/017

Publisher: IOP Publishing

Abstract: 

We investigated l- and m-distributions of He Pi (n=4) states formed during 2-13.3 keV amu^-1 He²⁺+Na(3s) collisions by measuring profiles and the linear polarization of the He Pi (4 to 3) emission. We found that at these energies capture into He⁺(4f) dominates over capture into other He⁺(4l) states. Over the indicated energy range the polarization of the ⁴He Pi (4 to 3) photon emission increases from 0.2 to 0.3 indicating a strong alignment of the captured projectile charge cloud along the internuclear axis. Due to the non-zero nuclear spin the polarization is up to 10% lower when using ³He²⁺ projectiles instead of ⁴He²⁺. Classical trajectory Monte Carlo calculations agree quantitatively with these experimental findings and predict a decrease of the polarization towards zero at higher energies due to enhanced capture into He⁺(4s). A positive polarization is also found for the Na I (3p to 3s) target de-excitation. However, due to strong depolarization effects caused by the nuclear spin of the ²³Na nucleus it stays below 0.14.

Harvard Citation style: Schippers, S., Boduch, P., Vanbuchem, J., Bliek, F., Hoekstra, R., Morgenstern, R., et al. (1995) Polarized light emission in keV He2++Na(3s) collisions, Journal of Physics B: Atomic, Molecular and Optical Physics, 28(15), pp. 3271-3282. https://doi.org/10.1088/0953-4075/28/15/017

APA Citation style: Schippers, S., Boduch, P., Vanbuchem, J., Bliek, F., Hoekstra, R., Morgenstern, R., & Olson, R. (1995). Polarized light emission in keV He2++Na(3s) collisions. Journal of Physics B: Atomic, Molecular and Optical Physics. 28(15), 3271-3282. https://doi.org/10.1088/0953-4075/28/15/017