=Date and Place=
Apr.4th,(Tues.), 13:30~ at RIBF Hall(room201)
(Assistant Prof. of Department of Chemistry, Tokyo Metropolitan University)
Relativistic quantum chemistry and recent applications to physics and chemistry
Relativistic effects in chemistry are important when molecules contain heavy atoms. This is because the electrons close to the heavy nucleus can travel rapidly, comparable to the light speed. The relativistic effects increase with atomic number Z, proportional to about Z^2, and they provide two important features. One feature is the contraction and stabilization of s and p orbitals. Because of the contractions of s and p orbitals, d and f orbitals are expanded and destabilized in many electronic systems. The other is the spin-orbit interaction, namely spin and angular momentum coupling. The spin-orbit interaction provides intersystem crossing of chemical reactions and phosphorous emission, for example. In my talk, I will introduce some known relativistic effects in chemistry according to the review by Pykko (“Relativistic effects in structural chemistry”, Chem. Rev. 88, 563-594, 1988). I will also present our recent molecular calculations for the electron’s electric dipole moment (eEDM), which should be calculated based on the relativistic quantum chemistry. eEDM is attractive because it can be a probe of the Charge-Parity violation beyond the standard model. If I have time, I will talk about a finite nuclear volume effect in isotope chemistry, (which is similar to the isotope field shift in atomic spectra). This problem becomes significant when the system contains heavy atoms and hence the precise relativistic treatment is important. Since the volume effects might affect some problems interested in geochemistry (for example the precision of lead-uranium dating), further theoretical investigations attract attentions nowadays.