BEGIN:VCALENDAR VERSION:2.0 PRODID:Data::ICal 0.22 BEGIN:VEVENT DESCRIPTION:Cass Sackett\, UVA-Physics\n\n
When you shine a laser on an ato m\, the electric field of the light induces a dipole moment\, resulting in an energy shift. The dipole can be either parallel or anti-parallel to th e field\, depending on the frequency of the light. This corresponds to neg ative or positive energies. At certain frequencies\, however\, the induced dipole is zero. The corresponding light wavelength is called a tune-out w avelength. The location of the various tune-out wavelengths depend on the electronic wave function in the atom\, particularly the dipole matrix elem ents . So by measuring the tune-out wavelength\, the dipole matrix element s can be determined more accurately than by conventional techniques. This is useful because the dipole matrix elements are also used to relate preci sion atomic experiments like parity violation to fundamental particle prop erties like the weak mixing angle. We have developed a new technique for m easuring \; tune-out wavelengths\, which should improve our knowledge of many matrix elements by an order of magnitude or more. We hope that thi s will support new generations of precision atomic measurements.
\n DTSTART:20170915T193000Z LOCATION:Physics Building\, Room 204 SUMMARY:Tune-out wavelength spectroscopy: a new technique to characterize a tomic structure END:VEVENT END:VCALENDAR