Heidelberg 2015 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

SYDM: Symposium Dipole Moments - A Tool to Search for New Physics

SYDM 3: Session 3

SYDM 3.7: Vortrag

Dienstag, 24. März 2015, 18:30–18:45, P/H1

Time-Domain MW Spectroscopy: Fundamental Physics From Molecular Rotation — •Jens-Uwe Grabow — Institut für Physikalische Chemie und Elektrochemie, Gottfried-Wilhelm-Leibniz-Universität, Hannover, Germany

Even the relativistic Dirac theory did not completely describe the spectrum of the electron in an H-atom. However, at that time, attempts to obtain accurate information have been frustrated by the large Doppler width in comparison to the small shifts. Then, advances in microwave (MW) techniques made it possible to observe the small energy difference of terms that were degenerate in Dirac's theory. This, as well as the small deviation of the electron's gyromagnetic ratio from the value 2, provided an excellent test of quantum electrodynamics (QED).

At present, the electron electric dipole moment (e-EDM) is a particularly good place to find, as proposed by Purcell and Ramsey, a new source for P and T violation. Since the Standart Modell's (SM) prediction is negligible, any observed e-EDM is direct evidence for "New Physics" beyond the SM. As at the time when Dirac's equation was put to test, attempts to obtain accurate information through a spectroscopic study are mostly frustrated by the large Doppler width in comparison to the small shifts. Again, obtaining more accurate information will be the key to provide a delicate test to the proposed theories. And again, employment of an MW method to hunt down a tiny effect has the potential to reveal the even smaller shifts in an e-EDM sensitive rotational transition, making it possible to observe the tiny energy difference of terms that are degenerate without an e-EDM.