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- W1668110388 abstract "The accumulation of large numbers of positrons in a Penning trap allows the authors to study two-body interactions of room temperature positrons with atoms and molecules. The authors present results from annihilation rate and {gamma}-ray spectrum measurements performed with a variety of substances. The annihilation rate measurements indicate the surprising existence of the long-lived positron-molecule compounds. The nature of these states is not understood. The Doppler-broadening of the annihilation {gamma}-ray line measures the center-of-mass momentum distribution of the annihilating positron-electron pair. Their precision measurements of lineshape are compared with the latest theoretical calculations for simple atoms. In partially fluorinated hydrocarbons, multiple annihilation sites in a molecule have been identified for the first time. Correlation of the {gamma}-ray measurements with the measured annihilation rates is presented. The implications of the new measurements, including interstellar positron annihilation, will be discussed." @default.
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- W1668110388 date "1996-05-01" @default.
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- W1668110388 title "Positron annihilation studies in a Penning trap: Partially fluorinated hydrocarbons" @default.
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