13 research outputs found
Traveling wave enantioselective electron paramagnetic resonance
ProducciĂłn CientĂficaWe propose a novel method for enantioselective electron paramagnetic resonance (EPR)
spectroscopy based on magneto-chiral anisotropy. We elaborate a theoretical model to estimate the
strength of this effect and propose a dedicated interferometer setup for its experimental observation.Agence Nationale de la Recherche (SECRETS, (ANR PRC 20-CE06-0023-01)Laboratory of Excellence NanoX (ANR-17-EURE-0009
A complex-polarization-propagator protocol for magneto-chiral axial dichroism and birefringence dispersion
A computational protocol for magneto-chiral dichroism and magneto-chiral birefringence dispersion is presented within the framework of damped response theory, also known as complex polarization propagator theory, at the level of time-dependent Hartree\u2013Fock and time-dependent density functional theory. Magneto-chiral dichroism and magneto-chiral birefringence spectra in the (resonant) frequency region below the first ionization threshold of R-methyloxirane and L-alanine are presented and compared with the corresponding results obtained for both the electronic circular dichroism and the magnetic circular dichroism. The additional information content yielded by the magneto-chiral phenomena, as well as their potential experimental detectability for the selected species, is discussed
Negative experimental evidence for magneto-orbital dichroism - supplemental information
A light beam can carry both spin angular momentum (SAM) and orbital angular
momentum (OAM). SAM is commonly evidenced by circular dichroism (CD)
experiments {\em i. e.} differential absorption of left and right-handed
circularly polarized light. Recent experiments, supported by theoretical work,
indicate that the corresponding effect with OAM instead of SAM is not observed
in chiral matter.
Isotropic materials can show CD when subjected to a magnetic field (MCD). In
Ref. ~\onlinecite{Mathevet2012} we report a set of experiments, under well
defined conditions, searching for magnetic orbital dichroism (MOD),
differential absorption of light as a function of the sign of its OAM. We
experimentally demonstrate that this effect, if any, is smaller than a few
of MCD for the Nd:YAG transition.
This transition is essentially of electric dipole nature. We give an intuitive
argument suggesting that the lowest order of light matter interaction leading
to MOD is the electric quadrupole term.
We give here more experimental details and extra measurements.Comment: 6 pages, 7 figures. Supplemental material for a publication in Optics
Expres
A density functional theory study of magneto-electric Jones birefringence of noble gases, furan homologues, and mono-substituted benzenes
The Diamagnetic Susceptibility of the Tubulin Dimer
An approximate value of the diamagnetic anisotropy of the tubulin dimer, ÎÏdimer, has been determined assuming axial symmetry and that only the α-helices and ÎČ-sheets contribute to the anisotropy. Two approaches have been utilized: (a) using the value for the ÎÏα for an α-helical peptide bond given by Pauling (1979) and (b) using the previously determined anisotropy of fibrinogen as a calibration standard. The ÎÏdimerâ4Ă10-27âJTâ2 obtained from these measurements are similar to within 20%. Although Cotton-Mouton measurements alone cannot be used to estimate ÎÏ directly, the value we measured, CMdimer=1.41±0.03Ă10-8âTâ2cm2mgâ1, is consistent with the above estimate for ÎÏdimer. The method utilized for the determination of the tubulin dimer diamagnetic susceptibility is applicable to other proteins and macromolecular assemblies as well