\\ Species Tag:        &   13003 & Name:&  CH+            
\\ Version:            &       2 & & Methylidynium
\\ Date:       & Sept. 2009       & & X $^1 \Sigma$
\\ Contributor:&  B. J. Drouin & & 
\\             &  J. C. Pearson& & 
\\ Lines Listed:       &       9 & Q(300.0)=&   15.3503 
\\ Freq. (GHz) $<$     &    7400 & Q(225.0)=&   11.5904
\\ Max. J:             &       9 & Q(150.0)=&    7.8376
\\ LOGSTR0=            &    -9.0 & Q(75.00)=&    4.0969
\\ LOGSTR1=            &         & Q(37.50)=&    2.2449
\\ Isotope Corr.:      &     0.  & Q(18.75)=&    1.3621
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&    1.0418
\\ $\mu_a$ = & 1.6               & A=& 
\\ $\mu_b$ = &                   & B=& 417616.89
\\ $\mu_c$ = &                   & C=& 
\headend 
 
There is only one reported pure rotational lines reported for CH$^+$ from
J. C. Pearson and B. J. Drouin, 2006, \emph{Astrophys. J.}, 647, {\bf L83}.
Electronic spectra reported by A. Carrington and D. A.
Ramsay, 1982, \emph{Phys.\ Scripta.} {\bf 25}, 272, and R. Hakalla, R. Kepa, 
W. Szajna, and M. Zachwieja, 2006, \emph{Eur. Phys. J.} D {\bf 38}, 481.
allow a combined analysis which improves the predictive capability
for the low $J$ rotational transitions reported here.
The dipole used is theoretically calculated by
 M. Cheng, J. M. Brown, P. Rosmus, R. Linguerri,
 N. Komiha, and E. G. Myers, 2007, \emph{Phys. Rev.} A 75, Art. No. 012502.