Density matrix for the H (n=3) atoms formed in electron-capture process ofH+-helium collisions at 25–100 keV

The full n=3 density matrices of hydrogen atoms formed after electron capture in ${\mathrm{H}}^{+}$-He collisions at 25–100 keV are calculated in a modified two-center atomic-orbital close-coupling expansion method. The integrated (over impact paramters) density matrix and its first-order moments are compared with recent experimental results. A charge-density plot is used to illustrate that the electron is lagging behind the projectile after the capture in the energy range considered. From the differential density matrix analysis, a ‘‘classical’’ orbital picture of the captured electron is proposed.