Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 11: Electron Dynamics in Chiral Systems SYCS 2 (with MO)
A 11.5: Talk
Monday, March 17, 2014, 15:30–15:45, BEBEL HS213
Characterisation and Control of Cold Chiral Compounds — •Chris Medcraft1,2,3, Thomas Betz1,2,3, V. Alvin Shubert1,2,3, David Schmitz1,2,3, and Melanie Schnell1,2,3 — 1Max-Planck-Institut für Struktur und Dynamik der Materie — 2Center for Free-Electron Laser Science — 3The Hamburg Centre for Ultrafast Imaging, Hamburg, Germany
A high-resolution, cavity-based Fourier-transform microwave spectrometer is being commissioned in Hamburg. It is based around the COBRA design (Coaxially Oriented Beam-Resonator Arrangement [1]) and consists of a semi-confocal arrangement of a planar mirror and a spherical curved mirror (diameter=0.6m, R=2m). The high resolution (ca. 3kHz) and larger spectral range (6-40GHz) of this instrument will complement our chirped-pulse FTMW spectrometer [2] (2-8.5GHz), allowing for investigations of nuclear quadrupole hyperfine structure and internal rotation. When combined with a source of cold, slow molecules [3] transit-time and Doppler broadening is reduced and the enhanced resolution may be able to discriminate the parity violating effects in large chiral molecules such as CpReNOCOI. We also present a method [4] that can distinguish between enantiomers by measuring a phase shift in a 3-wave mixing signal that is caused by the opposing signs of the product of the dipole moment components (μa.μb.μc).
[1] Grabow, Rev. Sci. Instrum. 67, 4072 (1996)
[2] Schmitz, Shubert, Betz, Schnell, J. Mol. Spec 280 (2012) 77
[3] Merz, et al, Phys. Rev. A 85, (2012) 063411
[4] Patterson, Schnell & Doyle Nature 497(2013) 475