Universality of photoelectron circular dichroism in the photoionization of chiral molecules

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Universality of photoelectron circular dichroism in the photoionization of chiral molecules
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2016
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English

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Abstract
Photoionization of chiral molecules by circularly polarized radiation gives rise to a strong forward/backward asymmetry in the photoelectron angular distribution, referred to as photoelectron circular dichroism (PECD). Here we show that PECD is a universal effect that reveals the inherent chirality of the target in all ionization regimes: single photon, multiphoton, above-threshold and tunnel ionization. These different regimes provide complementary spectroscopic information at electronic and vibrational levels. The universality of the PECD can be understood in terms of a classical picture of the ionizing process, in which electron scattering on the chiral potential under the influence of a circularly polarized electric field results in a strong forward/backward asymmetry.
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there's a kind of molecule and the same physical and chemical propriety unless they interact with another object because our body is full of coral molecule it as a huge impact on biological activities this Cairo sensitivity distinguishes from a nozzle become less than the powerful psychoactive street drugs most commonly used technique that
can discriminate carol molecule less sensitivity preventing their use to study generality in the the media such as gas phase molecules
1 solution to this issue is photoelectron circular dichroism also known as P. E. C. D
in a PC experiment we send a jet of randomly oriented coral molecules in a vacuum chamber where it can interacts with circularly polarized ionizing radiation the photoelectron angular distribution is recorded by a velocity map Spectrometer when coral molecules are ionized by circular light the more electrons can be in it in the forward direction then backwards this as symmetry is a pure electric dipole effect and is extremely strong it can reach several tens of percents this is what our VMI spectrometer looks like recently we showed that
table top circularly polarized space UV photons from resonant I alarming generation could be used to re PCD we also investigate the influence of resonant enhancement in multiphoton ionization showing that it is not necessary to observe PCD at IRA laser intensity we reached the above threshold ionization regime where we have measured PCD even for electron ionize well above the ionization treschow last we want to put this study to the tunneling machine we use a strong long point a micron laser field to follow ionize the Fenchel molecules remarkably even in this extreme ionization energy we still measured as significant PCD we thus conclude that PCD is a universal effect in the photoionization of coral molecules this universality raise important questions what is the physical origin of P. D is the process similar in single photon and Thom all ionization to answer this question the most natural option seems to solve the time-dependent Schroedinger equation or molecule interacting with the laser pulse and monitor devolution of the electron density which is the square models of the electronic wavefunctions 1 can notice that because of the scattering of
the outgoing electrons onto the nuclei at the end of the distribution of the freed electron get structure we can
understand BCD as emerging from the scattering of the outgoing electron wave function on the coral potential more precisely PCD it was found to be due to the scattering phases of the electrons this interpretation is certainly valid with scattering phases may not be the most input of quantity to think of we just wonder if there was a classical interpretation of the origin of P. we sold the classical equation of motion of an electron in a circularly polarized laser field and a choral molecule or potential the free electron does not directly escape the molecule when it is ionized it's scatter several times on the molecule or potential the physical origin of PCD can thus
be classically understood in terms of scattering of the electron trajectories in the coral potential which is close to the quantum pictures this is true for any laser wavelength and explains the universality of PCD if you want to know more you can read our paper in new Journal of Physics faster communications enjoy
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AV-Portal 3.20.2 (36f6df173ce4850b467c9cb7af359cf1cdaed247)
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