Traditional nuclear magnetic resonance (NMR) experiments are "blind" to chirality since the spectra for left and right handed enantiomers are identical in an achiral medium. However, theoretical arguments have suggested that the effective Hamiltonian for spin-1/2 nuclei in the presence of electric and magnetic fields can be different for left and right handed enantiomers, thereby enabling NMR to be used to spectroscopically detect chirality even in an achiral medium. However, most proposals to detect the chiral NMR signature require measuring signals that are equivalent to picomolar concentrations for (1)H nuclei, which are outside current NMR detection limits. In this work, we propose to use an AC electric field that is resonantly modulated at the Larmor frequency, thereby enhancing the effect of the chiral term by four to six orders of magnitude. We predict that a steady-state transverse magnetization, whose direction will be opposite for different enantiomers, will build up during application of an AC electric field. We also propose an experimental setup that uses a solenoid coil with an AC current to generate the necessary periodic electric fields that can be used to generate chiral signals which are equivalent to the signal from a (1)H submicromolar concentration.

We calculate the interaction nuclear magnetic shielding tensor for the 3Σu+ state of H2, using the electron gas theory that we have presented previously. We confirm the finite direct contribution of the exchange energy, and our general results agree qualitatively with a simple Heitler-London calculation. Comparison with experimentally derived results for 129Xe suggest that an electron gas calculation on that system would be valuable. © 1991 Taylor and Francis Ltd.

The authors' magnetic field density functional theory is extended to include electron spin-dependent interactions. Coupling the new theory with traditional spin density functional theory in the local limit yields a linear differential equation for the net spin density. The coefficients in the equation are functions of the electron density in the absence of a nuclear spin. © 1995.

We show that, by constructing a magnetic-field density functional theory for the response of many-electron systems to the magnetic field generated by two magnetic dipoles, one can calculate the orbital portion of the indirect spin-spin coupling, nuclear magnetic shielding tensor, and diamagnetic susceptibility of any such system. © 1995 American Chemical Society.