\\ Species Tag:        &   19001 & Name:&  HO-18          
\\ Version:            &       2 & & Hydroxyl radical,
\\ Date:       & May 1983       & & X $^ \Pi$ states
\\ Contributor:&   H. M. Pickett & & $^{18}$O isotope
\\             &                 & & 
\\ Lines Listed:       &     295 & Q(300.0)=&       81.941 
\\ Freq. (GHz) $<$     &    9839 & Q(225.0)=&       60.618 
\\ Max. J:             &      14 & Q(150.0)=&       40.327 
\\ LOGSTR0=            &    -9.9 & Q(75.00)=&       22.824 
\\ LOGSTR1=            &    -9.6 & Q(37.50)=&       17.053 
\\ Isotope Corr.:      &  -2.690 & Q(18.75)=&       16.007 
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&       15.929 
\\ $\mu_a$ = & 1.667             & A=& 
\\ $\mu_b$ = &                   & B=& 552470.
\\ $\mu_c$ = &                   & C=& 
\headend 
 
      The microwave data have been reported in R. A. Beaudet and R. L. Poynter,
1978, J. Phys. Chem. Ref. Data {\bf 7}, 311.  The fit involved
constraining the constants by isotope relations to the mean of those for OH
and OD, since only $\Lambda$ doubling data are available. The dipole moment 
was assumed to be the same as for the parent species.