[Triumf-seminars] TRIUMF ISAC Seminar today at 09:30

postmaster at admin.triumf.ca postmaster at admin.triumf.ca
Fri Mar 9 05:00:01 PST 2007


Date/Time: Fri 2007-03-09 at 09:30

Location:  Auditorium          

Speaker:   Hjalmar Bruhns (Columbia University)

Title:     Absolute Wavelength Measurements of Transitions in H- and He-like
Argon and Sulfur Ions with a Novel Crystal Spectrometer

Abstract: High-precision absolute and relative wavelength measurements of highly charged H-like and He-like ions have been carried out at the Heidelberg Electron Beam Ion Trap (EBIT) with a novel crystal spectrometer applying the Bond method. The Ar16+ results, with error bars less than 5 parts per million, are the most precise absolute wavelength measurements in highly charged ions up to now and confirm recent relativistic and QED calculations for this range of Z. This level of accuracy was reached by introducing a new method for the determination of the Bragg angle using two laser beams as fiducials. These make the commonly used entrance slits unnecessary, thus reducing the time necessary for reaching high statistical significance, and also eliminating various systematic geometric error sources. A comparison to theory and other experimental results will be presented.


Stimulants available 15 minutes before the talk.


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