\\ Species Tag:        &   16001 & Name:&  O-atom         
\\ Version:            &       4 & & $^3$P ground state
\\ Date:       & April 2025        & & 
\\ Contributor:&  B.J. Drouin     & & 
\\             &                 & & 
\\ Lines Listed:       &       2 & Q(300.0)=&        6.741 
\\ Freq. (GHz) $<$     &    3000 & Q(225.0)=&        6.324 
\\ Max. J:             &       2 & Q(150.0)=&        5.770 
\\ LOGSTR0=            &    -3.5 & Q(75.00)=&        5.156 
\\ LOGSTR1=            &    -5.2 & Q(37.50)=&        5.007 
\\ Isotope Corr.:      &     0.0 & Q(18.75)=&        5.000 
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&        5.000 
\\ $\mu_a$ = &                   & A=& 
\\ $\mu_b$ = &                   & B=& 
\\ $\mu_c$ = &                   & C=& 
\headend 
 
      The 68 cm$^{-1}$ J = 0-1 and the 158.3 cm$^{-1}$ J = 1-2 lines of oxygen have been measured by Tunable Far-Infrared spectroscopy (L.R. Zink, K.M. Evenson, F. Matsushima, T. Nelis and R. Robinson, 1991, Ap. J. {\bf 371}, L85-L86) and confirmed to within 15 MHz with LMR (J. Brown, K.M. Evenson, L.R. Zink, Phys. Rev. A 48(5), 1993.).  Drouin \emph{et al.} (B.J. Drouin, D. Nemchick, A. Maestrini, J. QUant. Spectrosc. \& Radiat. Trans., 2025) performed a pressure shift study of the 68 cm$^{-1}$ transition with a heterodyne system that resolved descrepancies in the TuFIR measurements and determined the rest frequency to 17 kHz.  Intensities were calculated using the free electron g factor.