Abstract-Synchrotron-based Highest Resolution Terahertz Spectroscopy of the ν24 Band System of 1,2-Dithiine (C4H4S2): A Candidate for Measuring the Parity Violating Energy Difference between Enantiomers of Chiral Molecules

Sieghard Albert, Fabienne Arn, Irina Bolotova, Ziqiu Chen, Csaba Fabri, Guido Grassi, Philippe Lerch, Martin Quack, Georg Seyfang, Alexander Wokaun, and Daniel Zindel

J. Phys. Chem. Lett., Just Accepted Manuscript

DOI: 10.1021/acs.jpclett.6b01674

Publication Date (Web): September 8, 2016

Copyright © 2016 American Chemical Society

The chiral, C2 symmetric molecule 1,2-dithiine (1,2-dithia-3,5 hexadiene, C4H4S2) has been identified as a possible candidate for measuring the parity violating energy difference between enantiomers. We report here the observation and analysis of the low frequency fundamental ν24 using highest resolution synchrotron-based interferometric Fourier Transform Infrared (FTIR) spectroscopy in the THz range with a band center of v0 = 6:95375559 THz ( v0 = 231:952319 (10) cm-1) and two related hot bands, the (v13 + v24) v13 band at v0 = 6:97256882 THz ( v0 = 232:579861 (33) cm-1) and the 2v24 v24 band at v0 = 7:014004336 THz ( v0 = 233:962001 (14) cm-1). This success in the difficult analyses of the THz spectrum of a complex chiral molecule of importance for fundamental tests on molecular parity violation is enabled by the ideal set up of an FTIR experiment of currently unique resolution with the very stable and bright synchrotron radiation at the Swiss Light Source (SLS).