Electron Paramagnetic Resonance Absorption in Oxygen with the HCN Laser

Abstract

Paramagnetic resonance absorption between the $N=3$, $J=4$, $M=\ensuremath{-}4$ and $N=5$, $J=5$, $M=\ensuremath{-}4$ levels of ground state ${\mathrm{O}}_{2}$ was observed at the HCN laser frequency of 890 759 \ifmmode\pm\else\textpm\fi{} 3 MHz in a magnetic field of 16 418 \ifmmode\pm\else\textpm\fi{} 1 G. This is the first observation of absorption in a gaseous sample in which laser electron-paramagnetic-resonance techniques were used.