\\ Species Tag:        &   41001 & Name:&  CH3CN          
\\ Version:            &       3 & & Acetonitrile
\\ Date:       &  Jan. 1997      & & Methyl Cyanide
\\ Contributor:&  J. C. Pearson  & & $nu_8$=0,1 
\\             &                 & & 
\\ Lines Listed:       &   29304 & Q(300.0)=&    41079.2740 
\\ Freq. (GHz) $<$     &    1832 & Q(225.0)=&    23622.3423
\\ Max. J:             &      99 & Q(150.0)=&    11400.2610 
\\ LOGSTR0=            &   -12.0 & Q(75.00)=&     3803.0012 
\\ LOGSTR1=            &   -10.0 & Q(37.50)=&     1347.2433 
\\ Isotope Corr.:      &       0.& Q(18.75)=&      492.9504 
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&      192.2864 
\\ $\mu_a$ = & 3.92197(13)       & A=& 158099.0
\\ $\mu_b$ = &                   & B=&   9198.9
\\ $\mu_c$ = &                   & C=&   B
\headend 

The experimental measurements are from: D. Boucher, J. Burie, J.
Demaison, A. Dubrulle, J. Legrand, and B. Segard, 1977, J. Mol.\ Spect.\
{\bf 64}, 290; A. Bauer and S. Maes, 1969, J. Phys.\ {\bf 30}, 169; S.
G. Kukolich, D. J. Ruben, J. H. S. Wang, and J. R. Williams, 1973, J.
Chem.\ Phys.\ {\bf 58}, 3155; S. G. Kukolich, G. Lind, M. Barfield, L.
Faehl and J. L. Marshall, 1978, J. Am.\ Chem.\ Soc.\ {\bf 100}, 7155; S.
G. Kukolich, 1982, J. Chem.\ Phys.\ {\bf 76}, 97; P. Venkateswarlu, J. G.
Baker and W. Gordy, 1961, J. Mol.\ Spectrosc.\ {\bf 6}, 215. D. Boucher,
J. Burie, A. Bauer, A. Dubrulle and J. Demaison, 1980, J. Phys. Chem.
Ref. Data {\bf 9}, 659; F. S. Pavone, L. R. Zink, M. Prevedelli, M.
Inguscio and L. Fusina, 1990, J. Mol.\ Spectrosc.\ {\bf 144}, 45; W.
Chen, R. Bocquet, D. Boucher, J. Demaison and G. Wlodarczak, 1991, J.
Mol. Spectrosc. {\bf 150}, 470; F. X. Brown, D. Dangoisse, and J.
Demaison, 1988, J. Mol.\ Spectrosc.\ {\bf 129}, 483; R. Bocquet, G.
Wlodarczak, A. Bauer and J. Demaison, 1988, J. Mol.\ Spectrosc.\ {\bf
127}, 382; F. Lewen, S. P. Belov, F. Maiwald, Th. Klaus and G.
Winnewisser, 1995, Z. Naturforsch.\ {\bf 50a}, 1182; and J. C. Pearson
and H. S. P. M\"uller, 1996, Astrophys.\ J. {\bf 471}, 1067.
	
The constants A, DK, HK cannot be determined from the microwave spectra
and were fixed to the IR measurements of: R. Anttila, V.-M. Horneman, M.
Koivussaari and R. Paso, 1993, J. Mol.\ Spectrosc.\ {\bf 157}, 198. M.
Koivussaari, V.-M. Horneman and R. Anttila, 1992, J. Mol.\ Spectrosc.\
{\bf 152}, 377.
		
The dipole moment for the ground state was reported by J. Gadhi, A.
Lahrouni, J. Legrand and J. Demaison, 1995, J. Chim.\ Phys.\ {\bf 92},
1984.  The $nu_8$ dipole was scaled from the ground state value by the
amount in J. K. Messer and J. A. Roerts, 1982, J. Mol.\ Spectrosc.\ {\bf
96}, 351.
	
The v quantum numbers assign the following: 0 is the ground state, 1 is
the K*l<0 l doublet of $nu_8$=1, 2 is the K*l>/=0 doublet of $nu_8$=1.
The v8=1 (CCN bending) band energy of 365.015965(12) cm$^{-1}$
(Koivusaari {\it et al.}) has been included in the calculation.  The
constants Pz$^{3}$ and Pz$^{5}$ off diagonal were fixed to the values
of Koivusaari {\it et al.}.