Abstract. The photoelectron angular distribution parameter of the relevant decay channels following the resonant 1s →np (n = 2-6) excitations in beryllium was measured. The 2s and 3s photoelectrons present at the 2p and 3p resonances, respectively, have β = 2 as predicted by theory. For the mp' spectator channels, small but distinct deviations from the expected complete isotropy were found. An explanation of these deviations is proposed in terms of the polarization of the 2s² subshell due to the excited np electron.

Print publication: Issue 21 (14 November 2001)
Received 4 September 2001
Published 30 October 2001