Electron Paramagnetic Resonance Absorption in Oxygen with the HCN Laser

Abstract

Paramagnetic resonance absorption between the $N=3\mathrm{}$, $J=4\mathrm{}$, $M=-4\mathrm{}$ and $N=5\mathrm{}$, $J=5\mathrm{}$, $M=-4\mathrm{}$ levels of ground state ${\mathrm{O}}_2$ was observed at the HCN laser frequency of 890 759 ± 3 MHz in a magnetic field of 16 418 ± 1 G. This is the first observation of absorption in a gaseous sample in which laser electron-paramagnetic-resonance techniques were used.