Lamb dip of a Quadrupole Transition in H${}_2$

F. M. J. Cozijn, M. L. Diouf, W. Ubachs

The saturated absorption spectrum of the hyperfine-less S(0) quadrupole line in the (2-0) band of H${}_2$ is measured at $\lambda =1189$ nm, using the NICE-OHMS technique under cryogenic co…