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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 373Asymmetric Positron Interactions with Chiral...

Asymmetric Positron Interactions with Chiral Quartz Crystals?

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Abstract:

We have studied the interaction of the positron with chiral left-or right-handed quartz crystals. In Doppler-broadening experiments, using a mono-energetic positron beam there is a differential depth profile for positrons implanted in LH or RH z-cut quartz as identified by a shape parameter (S). Further, in bulk positron annihilation lifetime spectroscopy (PALS) experiments, the lifetime (τ₂) attributed to free annihilation of the positron interacting with the chiral lattice exhibits a larger value for the LH quartz, and the associated intensity (I₂) is also significantly different—RH quartz is consistently 10% greater than the LH crystal. The τ ₃ lifetime and its intensity, I₃, attributed to positronium interacting with defects in the quartz, also appears to exhibit differences between the enantiomeric sets of crystals. These observations may demonstrate chiral recognition using a positron annihilation technique, pave the way for a broad range of positron experiments, and may help inform hypotheses of chirality recognition, selection, or induction by beta radiation.

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Periodical:

Defect and Diffusion Forum (Volume 373)

Pages:

221-226

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.373.221

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Online since:

March 2017

Authors:

J. David van Horn*, Fei Wu, Gerald Corsiglia, Yan Ching Jean

Keywords:

Asymmetry, Chirality, Crystalline Materials, Positron, Positronium, Quartz

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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