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• W2896696544 abstract "A theoretical study is conducted on the stability of exotic antiproton-hydrogen molecular anions ($overline{p}mathrm{H}$), which in the separated atom limit correlate with $overline{p}+mathrm{H}(n=2)$ ($n$ being the principal quantum number). The $overline{p}mathrm{H}$ molecule in the electronic ground state is highly unstable due to pair annihilation and autodetachment ($ensuremath{rightarrow}overline{p}p+e$). However, if the $overline{p}mathrm{H}$ molecule is electronically excited, the molecular stability can be drastically improved. Since the excited states of the $mathrm{H}$ atom have accidental degeneracy, the asymptotic form of the Born-Oppenheimer potential curve of $overline{p}+mathrm{H}(n=2)$ behaves as $1/{R}^{2}$ ($R$ being the relative distance), which can play a critical role in the bonding and stability of the molecule. It is found that the $overline{p}mathrm{H}$ molecule in the first electronic excited state and in a high rotational state is sufficiently stable and has a lifetime dominated by spontaneous radiative emission ($ensuremath{rightarrow}overline{p}+mathrm{H}+hensuremath{nu}$). The $overline{p}mathrm{H}$ system is dynamically similar to ${mathrm{H}}_{2}{phantom{rule{0.16em}{0ex}}}^{ensuremath{-}}$, which had been commonly considered to be unstable due to autodetachment. However, recent measurements of ion-beam sputtering unambiguously verified the existence of long-lived ${mathrm{H}}_{2}{phantom{rule{0.16em}{0ex}}}^{ensuremath{-}}$ molecules in high rotational states. This suggests that the $overline{p}mathrm{H}$ molecules may actually be created if one employs experimental means such as the chemical sputtering of hydrogen-rich targets with $overline{p}$ beams." @default.
• W2896696544 created "2018-10-26" @default.
• W2896696544 creator A5006218850 @default.
• W2896696544 date "2018-10-08" @default.
• W2896696544 modified "2023-09-25" @default.
• W2896696544 title "Exotic molecules consisting of an antiproton and a hydrogen atom" @default.
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• W2896696544 doi "https://doi.org/10.1103/physreva.98.042503" @default.
• W2896696544 hasPublicationYear "2018" @default.
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