of the weak-interaction-induced $\beta$-decay could have favoured one enantiomer over the other (Vester-Ulbricht hypothesis) [@Vester1959].\
So far, none of these explanations have been able to establich an unequivocal link between the fundamental parity violation and the biological homochirality on earth. Many calculations and great experimental efforts have been devoted to detect the parity violating energy difference $\Delta_{\mathrm{PV}}E$, but due to the extreme weakness of the effect (the expected relative shift of spectral lines $\Delta_{\mathrm{PV}}E/(h\nu)$ being below $10^{-14}$ for experimentally accessible species [@Darquie2010]), no observation has been made yet. Some authors conclude that the parity violation of the weak interaction is entirely independent from the one observed on the biological level [@Bonner2000].\
The investigation of chiral molecules is not only of fundamental but also of practical interest. It has been reported for various pharmaceutical substances that only one of the enantiomers is of therapeutical use (e.g. ethambutol [@Wilkinson1961]) or that the wrong enantiomer is even toxic (e.g. penicillamine [@Walshe1992]). Much effort has been devoted to developing enantiopure substances [@McConnell2007] and a wealth of techniques have been developed to distinguish and separate the enantiomers of a given species (see. e.g. [@Wolf2007]).\
Even though these techniques are well established, they do not yield 