电子偶素分子存在的标志
Signature of the existence of the positronium molecule
摘要：
正电子素分子（Ps $_2$）尚未被实验观察到，因为当分子通过发射两个能量为0.51 MeV的光子而湮灭时，其微小的（4.5 eV）结合能不能被检测到。本文指出，最近发现的L=1激发态与L=0基态之间的电偶极跃迁，其特征光子能量为4.94eV，是正电子素分子存在的明确标志，其实验观测的可能性是现实的。这种跃迁的几率约为总衰变率的17%.另一个包含正电子的库仑四体系统，HPs（正电子素氢化物或氢正离子），也被包括在内以供比较。
英文摘要：
The positronium molecule (Ps$_2$) has not been experimentally observed yet because its tiny (4.5 eV) binding energy cannot be detected when the molecule annihilates by emitting two photons with energy of 0.51 MeV each. It is shown in this paper that the electric dipole transition between the recently found L=1 excited-state and the L=0 ground-state with its characteristic photon energy of 4.94 eV is a clear signature of the existence of the positronium molecule and the possibility of its experimental observation is realistic. The probability of this transition is about 17 % of the total decay rate. An other Coulomb four-body system containing positron, HPs (the positronium hydride or hydrogen positride), is also included for comparison.
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