\\ Species Tag:        &   41001 & Name:&  CH3CN          
\\ Version:            &       4 & & Acetonitrile
\\ Date:       &  Dec. 2009      & & Methyl Cyanide
\\ Contributor:&  H. S. P. M\"uller  & & g.s. 
\\             &                 & & 
\\ Lines Listed:       &    1728 & Q(300.0)=&    10118.2635 
\\ Freq. (GHz) $<$     &    1864 & Q(225.0)=&     6570.5621
\\ Max. J:             &      99 & Q(150.0)=&     3576.3518 
\\ LOGSTR0=            &    -7.0 & Q(75.00)=&     1265.1853 
\\ LOGSTR1=            &    -8.5 & Q(37.50)=&      449.0803 
\\ Isotope Corr.:      &       0.& Q(18.75)=&      164.3168 
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&       64.0955 
\\ $\mu_a$ = & 3.92197(13)       & A=& 158099.0
\\ $\mu_b$ = &                   & B=&   9198.9
\\ $\mu_c$ = &                   & C=&   B
\headend 

This entry is a combined CDMS and JPL entry.  The $\nu_8$ entry is now a separate catalog entry under 41010.
The latest combined fit has been reported by
(1) H. S. P. M\"uller; B. J. Drouin, and J. C. Pearson, 
2009, \emph{Astron. Astrophys.} \textbf{506}, 1487.
This work provides new data in the 1.58-1.63THz region. Additional, extensive data between 
91 and 1192 GHz were published in
(2) G. Cazzoli and C. Puzzarini, 
2006, \emph{J. Mol. Spectrosc.} \textbf{240}, 153.
As in that work, additional data were taken from
(3) S. G. Kukolich, D. J. Ruben, J. H. S. Wang, and J. R. Williams,
1973, \emph{J. Chem. Phys.} \textbf{58}, 3155;
from
(4) S. G. Kukolich, 
1982, \emph{J. Chem. Phys.} \textbf{76}, 97;
and from
(5) D. Boucher, J. Burie, J. Demaison, A. Dubrulle, J. 
Legrand, and B. Segard, 
1977, \emph{J. Mol. Spectrosc.} \textbf{64}, 290.
The purely $K$-dependent terms were determined through 
$\Delta K =$ 3 infrared loops
from
(6) R. Anttila, V.-M. Horneman, M. Koivusaari, and 
R. Paso, 
1993, \emph{J. Mol. Spectrosc.} \textbf{157}, 198.
The predictions should be reliable throught with 
the exception of $K >$14 transitions 
between about $J$ = 36 and 48 which 
are perturbed by a weak resonant interaction 
with $v_8 =$ 1.
$^{14}$N hyperfine splitting may be resolvable 
at low values of $J$ and possibly at the highest 
$K$. Therefore, predictions with 
http://spec.jpl.nasa.gov/catalog/hfs/c041001\_hfs.cat
hyperfine splitting have been provided up to 
$J"=$9 (184 GHz). 
The partition function does \textbf{not} include the 
spin-multiplicities of $^{14}$N. Therefore, 
partition function values have to be multiplied by 3 
when considering  $^{14}$N hyperfine splitting. 
Vibrational contributions have been considered in 
the calculation of the partition function for states 
up to about 1200 cm$^{-1}$. 
Higher vibrational states contribute to less 
than 1\% each at 300 K. 
Values for the ground state are given in parentheses. 
Additional information on 
http://www.ph1.uni-koeln.de/site/vorhersagen/daten/CH3CN/CH3CN/CH3CN.Q
vibrational states is also available.
The dipole moment was determined by
(7) J. Gadhi, A. Lahrouni, J. Legrand, and 
1995, \emph{J. Chem. Phys.} \textbf{92}, 1984.