Parity-violating energy difference PVED

Mason and Tranter performed calculations and alleged that a 1.4% excess of /- over r/-quartz on the surface of Earth is the inevitable consequence of a parity-violating energy difference (PVED). They calculated that the /-quartz is stabilized by lO kT per Si02 unit This allegation is based on a report that there is 50.17% /-quartz and 49.3% r/-quartz in 16,807 samples collected worldwide that is an excess of 1.4% of /-quartz. But a more recent survey of 27,053 samples yields 50.17 % r/-quartz and 49.83 % /-quartz, which is a. 0.39 % excess of r/-quartz. Therefore it is necessary to accept the fact that the terrestrial distribution of optically active quartz crystals is quite random and, consequently, no basis exists for calcula-... 

These experimental results could not be confirmed by Lahav and co-workers they suggest that impurities in the starting materials have a much greater effect on the crystallisation process than the PVED (Parity Violating Energy Difference). Extensive experimental studies indicate the importance of small quantities of impurities, particularly in early phases of crystallisation nucleus formation. Amino acids from various sources were used, and the analyses were carried out using the enan-tioselective gas chromatography technique (M. Lahav et al 2006). 

Since the historical PV weak force origin /3-decay experiment of 60Co [ 106], theoreticians presumed that the tiny parity violating WNC at molecular and subatomic levels may also allow a distinction between mirror image molecules at the macroscopic level as well. This is because PV-WNC at the molecular level may be a candidate for the homochiral scenario under terrestrial and extraterrestrial conditions [1,2,104,109-118]. The WNC, however, did not induce any observable PV effects between enantiomers in their ground states because of the minuscule PV energy difference (PVED) of 10 19 eV and/or negligibly small 10 - % ee in racemates. Theoreticians also proposed several possible amplification mechanisms at reproducible detection levels within laboratory time scales and at terrestrial locations [113,117,118]. 

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