\\ Species Tag: & 51002 & Name:& ClO \\ Version: & 3 & & Chlorine monoxide, \\ Date: & Jan. 1991 & & X $^2\Pi$ states, v = 0 \\ Contributor:& E. A. Cohen & & \\ & & & \\ Lines Listed: & 2585 & Q(300.0)=& 3349.655 \\ Freq. (GHz) $<$ & 2983 & Q(225.0)=& 2307.810 \\ Max. J: & 83 & Q(150.0)=& 1424.624 \\ LOGSTR0= & -10.0 & Q(75.00)=& 689.287 \\ LOGSTR1= & -11.5 & Q(37.50)=& 351.318 \\ Isotope Corr.: & -0.122 & Q(18.75)=& 183.316 \\ Egy. (cm$^{-1}$) $>$& 0.0 & Q(9.375)=& 99.701 \\ $\mu_a$ = & 1.2974 & A=& \\ $\mu_b$ = & & B=& 18601.791 \\ $\mu_c$ = & & C=& \headend The experimental lines are from R. K. Kakar, E. A. Cohen, and M. Geller, 1978, J. Mol. Spect. {\bf 70}, 243, and E. A. Cohen, H. M. Pickett, and M. Geller, 1984, J. Mol. Spect. {\bf 106}, 430. The millimeter and submillimeter data were combined with the FT infrared data of J. B. Burkholder {\it et al.}, 1987, J. Mol. Spect. {\bf 124}, 139, in a simultaneous fit to both vibrational states. The partition function is a sum over the ground and first vibrational state up to F = 90 for both the $\Omega = 3/2$ and $\Omega = 1/2$ states. The dipole moment is from D. Yaron, K. Peterson, and W. Klemperer, 1988, J. Chem. Phys. {\bf 88,} 4702.