High precision spectroscopy

The arrival of a very well-known frequency and ultra-stable reference in laboratories opens the possibility to set up experiences with a high level of precision that were inaccessible yet. Without being exhaustive, we can mention the spectroscopy of hydrogen and its derivatives, high-resolution spectroscopy in the physics of atoms, ions and molecules, the search for parity violation effect in molecules, measuring the Boltzmann constant, ...

	Photograph of the diode laser spectrometer  used for spectroscopic studies of ozone (credits to LPMAA)
	Cooling of atoms                             (condensation of Chrome)                             (credits to LPL)