Hyperfine Structure in the Molecular IonH2+

Abstract

I have observed 30 transitions between hyperfine levels of ${\mathrm{H}}_2^{+}$, the simplest molecule. This is the first observation of the complete hyperfine structure for this system. The measured transition frequencies range from 3.989 to 1276.271 MHz, and fully define the hyperfine energy level schemes for the rotational states $K=1\mathrm{}$ and $K=2\mathrm{}$ and the vibrational states $v=4-8\mathrm{}$.