Wild water

 作者:公孙父拌     |      日期:2019-03-08 04:20:10
SCIENTISTS are hunting for a new chemical oddity—water containing antimatter. A positron, the antiparticle of an electron, can combine with an electron to form a hydrogen-like “positronium” atom. This is very short-lived, and soon annihilates itself in a flash of light. But during its fleeting lifetime, positronium can bond with other atoms. David Schrader of Marquette University in Milwaukee, Wisconsin, has now calculated that two positronium atoms could bond to an oxygen atom to form positronic water, which would survive for 0.2 billionths of a second. In future, it may be possible to make the bizarre molecule by forming tiny clumps of a million positrons and firing them at surfaces containing oxygen, Schrader says in Physical Review Letters (vol 81,