\\ Species Tag:        &  143001 & Name:&  IO        
\\ Version:            &       1 & & Iodine monoxide, $v=0-4$
\\ Date:       &  May 2011      & &
\\ Contributor:&  E. A. Cohen    & & $X_1\,^2\Pi_{3/2}$ and  $X_2\,^2\Pi_{1/2}$ states
\\             &  B. J. Drouin   & & 
\\ Lines Listed:       &    8833 & Q(300.0)=&     7724.2610
\\ Freq. (GHz) $<$     &    2057 & Q(225.0)=&     5641.2543 
\\ Max. J:             &    102.5& Q(150.0)=&     3721.0395
\\ LOGSTR0=            &   -11.0 & Q(75.00)=&     1867.1783
\\ LOGSTR1=            &    -9.0 & Q(37.50)=&      943.6820
\\ Isotope Corr.:      &  -0.000 & Q(18.75)=&      482.1681
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&      251.6880
\\ $\mu_a$ = & 2.                & A=& 
\\ $\mu_b$ = &                   & B=& 10108.36
\\ $\mu_c$ = &                   & C=& 
\headend 


        The spectrum was calculated from a combined fit of rotational spectra of
two isotopic species $^{127}$I$^{16,18}$O as well as available radio frequency $\Lambda$ doublet
spectra.  The fit is described by C.E. Miller, E.A. Cohen, J. Chem. Phys. 115(4) 6459-6470, 2001.  The dipole moment is from the ESR measurements of C.R. Byfleet, A. Carrington and D.K. Russell, Mol. Phys. 20, 271, 1971.  The partition function includes vibrational levels up to $v =$ 13 and rotational levels up to $J =$ 159.5.  The intensity cutoff is set low enough to include transitions of the $^2\Pi_{1/2}$ state, which are weak at 300 K.  As a result, many excited vibrational state transition are also included in the prediction.