Improved sensitivity in the search for a parity-violating energy difference in the vibrational spectrum of the enantiomers of CHFClBr |
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| Authors: | M Ziskind C Daussy T Marrel Ch Chardonnet |
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| Institution: | (1) Laboratoire de Physique des Lasers, Université Paris 13, 99 avenue J.-B. Clément, 93430 Villetaneuse, France, FR |
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| Abstract: | The theoretical prediction that enantiomers of chiral molecules have different spectra because of parity violation associated
with neutral currents in the weak interaction has been experimentally looked for. Last searches of a frequency difference
in the vibrational spectrum of the enantiomers of CHFClBr obtained with our infrared saturation spectrometer is presented.
The frequencies of a saturation resonance of separated enantiomers of CHFClBr have been compared at a 5×10-14 level. A residual pressure shift probably induced by uncontrolled impurities of the samples has been observed and found to
limit our experimental sensitivity. Finally no parity violating frequency difference is observed within the present sensitivity
of 2.5×10-13. A new experimental scheme is proposed which should let the parity violation effect observable.
Received 22 January 2002 Published online 19 July 2002 |
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| Keywords: | PACS 33 15 Bh General molecular conformation and symmetry stereochemistry – 11 30 Er Charge conjugation parity time reversal and other discrete symmetries – 33 20 Ea Infrared spectra |
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