SIGNATURE OF THE EXISTENCE OF THE POSITRONIUM MOLECULE
SIGNATURE OF THE EXISTENCE OF THE POSITRONIUM MOLECULE
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正电子分子存在的签名
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
Atomki
中科院分区：
文献类型：
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作者：
J. Usukura;K. Varga;Y. University;Atomki
正电子分子$({mathm{Ps}}_{2})$({mathm{ps}}_{2})还没有被实验观察到，因为当分子发射两个能量分别为0.51 MeV的光子湮没时，它微小的(4.5 eV)结合能无法被检测到。本文指出，最近发现的$L=1$激发态到$L=0$基态之间的电偶极跃迁是正电子分子存在的明显标志，其特征光子能量为4.94 eV，其实验观测的可能性是现实的。这种跃迁的概率约为总衰减率的17%。另一种包含正电子HPS(正电子氢化物或正氮化氢)的库仑四体系统也包括在内，以供比较。
The positronium molecule $({mathrm{Ps}}_{2})$ 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. Another Coulomb four-body system containing positron HPs (the positronium hydride or hydrogen positride), is also included for comparison.