\\ Species Tag:        &   13002 & Name:&  CH             
\\ Version:            &       2 & & Methylidyne
\\ Date:       & Feb. 2010       & & X $^2 \Pi$ states
\\ Contributor:&  B.J. Drouin    & & v = 0,1
\\             &                 & & 
\\ Lines Listed:       &     508 & Q(300.0)=&      120.8419 
\\ Freq. (GHz) $<$     &    9929 & Q(225.0)=&       91.3640 
\\ Max. J:             &      12 & Q(150.0)=&       61.9974 
\\ LOGSTR0=            &    -9.5 & Q(75.00)=&       32.9221 
\\ LOGSTR1=            &    -6.9 & Q(37.50)=&       18.8471 
\\ Isotope Corr.:      &     0.  & Q(18.75)=&       12.1999 
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&        8.9599 
\\ $\mu_a$ = & 1.46              & A=& 
\\ $\mu_b$ = &                   & B=& 425476.2460
\\ $\mu_c$ = &                   & C=& 
\headend 
 
A fit to a Hund's case (b) Hamiltonian utilized extensive data for v = 0 for the fine structure band, and rotational transitions (1) Ziurys and Turner Ap. J. 292, L25, 1985; (2) McCarthy et al. Proc. Nat. Acad. Sci. U.S.A. 103(33)  12263-12268, 2006; (3) Brazier and Brown J. Chem. Phys. 78(3) 1608-1610, 1983; (4) McCarthy et al. Proc. Nat. Acad. Sci. U.S.A. 103(33)  12263-12268, 2006; (5) Bogey et al. Chem. Phys. Lett. 100, 105, 1983; Amano Ap. J. 531:L161-L164, 2000; (6) Davidson et al. Ap. J. 546(1) 330-337, 2001.  A small amount of v = 1 fine structure data (Jackson et al. J. Molec. Spectrosc. 247,  128-139, 2007) was combined with infrared measurements of Bernath J. Chem. Phys. 86(9) 4838-4842, 1987 and found to reproduce the LMR calculations (also in Jackson et al. J. Molec. Spectrosc. 247,  128-139, 2007) well for v = 1 rotational transitions.  The dipole moment was taken from D. J. Phelps and F. W. Dalby, 1966, Phys. Rev. Lett. {\bf 16}, 3.