Possibility of Creating a 62.6 nm Frequency Standard in Helium Using Stimulated Raman Scattering

摘要

The possibility of creating a frequency standard at the forbidden transition 2(3)S-1(1)S (62.6 nm) of a helium atom using stimulated Raman scattering has been shown. The singlet state is the ground state and the metastable state 2(3)S (He*) has the lowest energy in the spectrum triplet part. The standard can be used to measure frequencies in the region of extreme ultraviolet and, possibly, X-ray radiation.