{"id":1940,"date":"2021-07-09T14:52:36","date_gmt":"2021-07-09T12:52:36","guid":{"rendered":"http:\/\/172.24.24.16\/?page_id=1940"},"modified":"2025-02-28T17:04:45","modified_gmt":"2025-02-28T16:04:45","slug":"fundamental-measures","status":"publish","type":"page","link":"http:\/\/www.lac.universite-paris-saclay.fr\/?page_id=1940&lang=en","title":{"rendered":"Fundamental measures"},"content":{"rendered":"\n

<\/h1>\n\n\n

Fundamental measures<\/span><\/h1><\/div><\/div><\/div>\n\n\n

This activity includes several activities: manipulation of cold molecules, study of antimatter with collaborations at CERN, and measurement of the electric dipole moment of the electron<\/p>\n\n\n\n

\n\n\n
\n\t\t\t
\n\t\t\t\t
\n\t\t\t\t
Cold molecules<\/div>\n\t\t\t<\/div>
\n\t\t\t\t
Antimatter<\/div>\n\t\t\t<\/div>
\n\t\t\t\t
EDM<\/div>\n\t\t\t<\/div>
\n\t\t\t\t
Members<\/div>\n\t\t\t<\/div><\/div>\n\t\t\t<\/div>\n\t\t\t
\n\n
\"alt

The experiment deals with the cooling of the internal and external degrees of freedom of a BaF beam. The achievements and perspectives converge towards the objective of obtaining a cold sample of molecules. The aim is to optimize the number of molecules and to control their movement in order to carry out precision measurements (which could be facilitated by the installation of a frequency comb and the arrival of the reference signal REFIMEVE) on the P and CP violation effects for which the BaF molecule is known to have a good sensitivity (dipole of the electron or parity violation effects in the nucleus).<\/p>\n\n

Following the installation of the electrostatic decelerator, the immediate next step in the experiment will be to study neutralization, i.e. electron capture by BaF+ ions. For this, a jet of of cesium atoms promoted to a Rydberg state (Cs* ) will provide a source of cold electrons. The study of BaF+ \/Cs* interactions will be the focus of our work: the aim will be to understand the mechanism and efficiency of charge transfer, and identifying in which final states BaF neutralizes itself. Finally, we also intend to use a negative ionic intermediate BaF\u2013 , more precisely a dipolar anion, for which the formation and neutralization will require specific studies.<\/p>\n\n

For this ongoing and future work, we will develop new analytical tools (in in particular velocity imaging -VMI and a pulsed laser with optimized spectral linewidth at the Fourier limit)<\/p><\/div>\n\n<\/div>

\n\n
\n
\n
\n