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2017 | 132 | 5 | 1456-1460
Article title

Positron Annihilation Lifetime Analysis of Left- and Right-Handed Alanine Single Crystals

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Abstracts
EN
Studies of the interaction of polarized light or particles (including electrons, e¯, or positrons, e⁺) with asymmetric forms of matter has been of interest to scientists since the discovery of chirality and the subsequent development of particle physics. Researchers have been interested in e⁺ interactions with chiral molecules for decades, but with mixed and indecisive results. After reviewing the field, we speculated that the e⁺ or positronium (Ps) might interact differently with chiral pairs of large single crystals, i.e., the left-handed or right-handed asymmetric forms of the crystals - and subsequently observed significant differences in "free positron" annihilation and intensities in the evaluation of left-handed or right-handed quartz single crystals. This result may be understood to be a "particle stereorecognition" phenomenon. To extend this line of inquiry we crystallized mm scale L- or D-alanine crystals and performed positron annihilation lifetime spectroscopy measurements using a ²²Na positron source. Alanine crystals were obtained via slow evaporation of water in a Dewar, or from water/acetone solvent in a temperature-controlled environment. These methods resulted in small ( ≈0.5 cm/side) or large ( ≥1.0 cm/side) crystals, respectively. While some intensity (I₂) results from left-handed and right-handed crystals varied in positron annihilation lifetime spectroscopy analysis, the errors associated with the measurements do not indicate a stereorecognition of alanine via positron interactions.
Keywords
Contributors
author
  • Department of Chemistry, Faculty of Science and Arts, Bilecik Şeyh Edebali University, 11210 Bilecik, Turkey
author
  • Department of Chemistry, University of Missouri-Kansas City, 5110 Rockhill Rd., Kansas City, Missouri 64110, USA
author
  • Department of Chemistry, Faculty of Science and Arts, Bilecik Şeyh Edebali University, 11210 Bilecik, Turkey
author
  • Department of Chemistry, University of Missouri-Kansas City, 5110 Rockhill Rd., Kansas City, Missouri 64110, USA
author
  • Department of Chemistry, University of Missouri-Kansas City, 5110 Rockhill Rd., Kansas City, Missouri 64110, USA
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Document Type
Publication order reference
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YADDA identifier
bwmeta1.element.bwnjournal-article-appv132n5p03kz
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