Université de Fribourg

Spectroscopic, time-resolved, and Stark effect studies of alkali atoms and exciplexes in solid ⁴He

Hofer, Adrian ; Weis, Antoine (Dir.) ; Bally, Thomas (Codir.) ; Ernst, Wolfgang E. (Codir.)

Thèse de doctorat : Université de Fribourg, 2007 ; Nr. 1571.

This thesis work was carried out in the atomic physics group of the Physics Department of the University of Fribourg. The thesis is divided into two main parts, and contains in total six original research papers. The first part deals with purely optical studies of Cs and Rb atoms and their exciplex molecules and clusters implanted in solid 4He crystals. The second part is an experimental and...

Université de Fribourg

Theoretical and experimental study of the Stark effect in the ground state of alkali atoms in helium crystals

Ulzega, Simone ; Weis, Antoine (Dir.)

Thèse de doctorat : Université de Fribourg, 2006.

This thesis work describes a detailed study of the Stark interaction in the ground state of cesium atoms trapped in a solid helium matrix. The motivation for the investigation of electric field effects on alkali species implanted in solid helium is related to the original main goal of our experimental activities, i.e., the measurement of a permanent atomic electric dipole moment (EDM). The...

Université de Fribourg

Optical magnetic resonance tomography and laser spectroscopy of cesium atoms trapped in solid helium

Nettels, Daniel ; Weis, Antoine (Dir.) ; Dousse, Jean-Claude (Codir.) ; Wynands, Robert (Codir.)

Thèse de doctorat : Université de Fribourg, 2003 ; no 1432.

The present thesis has resulted from my research work carried out at the University of Bonn and at the University of Fribourg. The thesis can be roughly divided into two distinct parts, which reflect the research carried out in both places. In Bonn I worked on optical magnetic resonance tomography of atoms in the gas phase, while all of my time in Fribourg was devoted to study specific problems...

Université de Fribourg

Laser-pumped cesium magnetometers for the PSI-nEDM experiment

Gröger, Stephan ; Weis, Antoine (Dir.) ; Dousse, Jean-Claude (Codir.) ; Daum, Manfred (Codir.)

Thèse de doctorat : Université de Fribourg, 2005 ; Nr. 1487.

This thesis work describes the development of a high resolution magnetic field sensor for a fundamental research project of an international collaboration with participation of the Fribourg Atomic Physics Group. The goal of the collaboration is an experiment searching for an electric dipole moment of the neutron (nEDM), d, which will be performed at Paul Scherrer Institute (PSI). The possible...

Université de Fribourg

Development of an optical cardio-magnetometer

Bison, Georg ; Weis, Antoine (Dir.) ; Scheffold, Frank (Codir.) ; Erné, Sergio-Nicola (Codir.)

Thèse de doctorat : Université de Fribourg, 2004 ; Nr. 1450.

This thesis describes the development of a new type of cardiomagnetometer, a device that can measure the magnetic field generated by the beating human heart. Such exceedingly weak magnetic fields carry diagnostically relevant information and can be measured noninvasively at the surface of the body. Cardiomagnetic measurements were previously performed using superconducting magnetometers (SQUID)...