Abstract
We have studied the compression behaviors of Ne, Ar, and Kr in comparison with the isoelectronic counterparts of NaF, KCl, and RbBr to 120 GPa, using in situ angle-resolved x-ray diffraction. Interestingly, the pressure-volume compression data indicate the emergence between the isoelectronic pairs of NaF/Ne $>60\phantom{\rule{0.16em}{0ex}}\mathrm{GPa}$, KCl/Ar $>30\phantom{\rule{0.16em}{0ex}}\mathrm{GPa}$, and RbBr/Kr $>25\phantom{\rule{0.16em}{0ex}}\mathrm{GPa}$---analogous to that previously observed in CsI/Xe $>80\phantom{\rule{0.16em}{0ex}}\mathrm{GPa}$. The interatomic distances of the isoelectronic pairs also become similar as pressure increases, within the difference of $\ensuremath{\sim}3%$, underscoring the pressure-induced electron polarization in novel gas solids, stronger in Xe and getting weaker in Kr, Ar, and Ne. In contrast, the compression curves and interatomic distances of He and LiF remain distinctive to 200 GPa.
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