Jena 2013 – scientific programme
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K: Fachverband Kurzzeitphysik
K 1: Optische Methoden und Verfahren
K 1.5: Talk
Monday, February 25, 2013, 15:15–15:30, HS 4
Mass-selective discrimination of chirality by femtosecond coincidence imaging — •Carl Stefan Lehmann1, Bhargava Ram1, Ivan Powis2, and Maurice Janssen1 — 1LaserLaB, Vrije Universiteit Amsterdam, Niederlande — 2University of Nottingham, UK
In 1976 Ritchie [1] predicted that one-photon ionization with circular polarized light of chiral molecules results in a forward-backward asymmetry in the angular distribution of electrons. Experimentally, this asymmetry was first observed in 2001 in one-photon ionization with synchrotron radiation. This photo-electron circular dichroism (PECD) effect is up to three orders of magnitude larger than the conventional CD, as it results from normal electric dipole excitation.
Here We report femtosecond multi-photon ionization in combination with electron-ion coincidence imaging to mass-selectively discriminate chiral molecules. We demonstrate that this novel technique, using a table-top reaction microscope [2,3], can be used to detect mass-selected chiral molecules with high selectivity and sensitivity, which makes very promising as an analytical technique to characterize chiral samples.
[1] Phys. Rev. A 13, 1411 (1976).
[2] Rev. Sci. Instrum. 79, 063108 (2008).
[3] Rev. Sci. Instrum. 83, 093103 (2012).