Antiproton-impact ionization of Ne, Ar, Kr, Xe, and ${\text{H}}_2\text{O}$

We calculate antiproton-impact total single ionization of Ne, Ar, Kr, Xe, and ${\mathrm{H}}_2\mathrm{O}$ using a time-dependent convergent close-coupling approach. The Ne, Ar, Kr, and Xe atom wave functions are described in a model of six $p$-shell electrons above a frozen Hartree-Fock core with only one-electron excitations from the outer $p$ shell allowed. For treating the water molecule we use a neonization method recently proposed by Montanari and Miraglia [J. Phys. B: At. Mol. Opt. Phys. 47, 015201 (2014)], which describes the ten-electron water molecule as a dressed Ne-like atom in a pseudospherical potential. In the present work the target states of noble gas atoms and water are obtained using a Laguerre basis expansion. For the noble gas atoms there is reasonably good agreement with the calculated single-ionization cross sections.

Figure 1

Integrated single-ionization cross section for $\overline{p}$-Ne collisions. The present CCC and Born results are compared with the experimental measurements of Paludan et al. [18], independent-particle calculations of Kirchner et al. [21, 22] with “response” (IPM-BGM 1) and with “no response” (IPM-BGM 2), and CDW-EIS calculations of Montanari and Miraglia [23].

Figure 2

Integrated single-ionization cross section for $\overline{p}$-Ar collisions. Present CCC and Born results are compared with the experimental measurements of Paludan et al. [18] and Knudsen et al. [19]. Independent-particle calculations of Kirchner et al. [21, 22] with “response” (IPM-BGM 1) and CDW-EIS calculations of Montanari and Miraglia [23] are also shown.

Figure 3

Integrated single-ionization cross section for $\overline{p}$-Kr collisions. Present CCC and Born results are compared with the experimental measurements of Paludan et al. [18] and CDW-EIS calculations of Montanari and Miraglia [23].

Figure 4

Integrated single-ionization cross section for $\overline{p}$-Xe collisions. Present CCC and Born results are compared with the experimental measurements of Paludan et al. [18] and CDW-EIS calculations of Montanari and Miraglia [23].

Figure 5

Integrated single-ionization cross section for $\overline{p}\text{−}{\mathrm{H}}_2\mathrm{O}$ collisions. The present CCC and Born results are shown.