\\ Species Tag:        &   55001 & Name:&  C2H5CN         
\\ Version:            &       5 & & Ethyl Cyanide or Propionitrile,
\\ Date:       &  July 2009      & & Ground State, Watson's A-reduced Hamiltonian
\\ Contributor:&C. S. Brauer   &&
\\             &B. J. Drouin   && 
\\             &               & & 
\\ Lines Listed:       &   64345 & Q(300.0)=&    37424.5761 
\\ Freq. (GHz) $<$     &    3371 & Q(225.0)=&    24286.9323 
\\ Max. J:             &     150 & Q(150.0)=&    13209.5866
\\ LOGSTR0=            &    -9.0 & Q(75.00)=&     4667.9360
\\ LOGSTR1=            &    -9.0 & Q(37.50)=&     1651.0571 
\\ Isotope Corr.:      &       0 & Q(18.75)=&      584.6478 
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&      207.4255 
\\ $\mu_a$ = & 3.85              & A=& 27663.7
\\ $\mu_b$ = & 1.23              & B=&  4714.2
\\ $\mu_c$ = &                   & C=&  4235.1
\headend 

The experimental measurements were analyzed using an A-reduced Hamiltonian.  The measurements were taken from: C. S. Brauer, J. C. Pearson, B. J. Drouin, and SS.Yu, 2009, (in press), J. Burie, J. Demaison, A. Dubrulle, and D. Boucher, 1978, J. Mol. Spect. {\bf 72}, 275; D. R. Johnson, F. J. Lovas, C. A. Gottlieb, E. W. Gottlieb, M. M. Litvak, M. Guelin, and P. Thaddeus, 1977, Astrophys. J. {\bf 218}, 370; F. J. Lovas, 1982, J. Phys. Chem. Ref. Data {\bf 11}, 251; H. M\"ader, H. M. Heise, and H. Dreizler, 1973, Z. Naturforsch. {\bf 29a}, 164; J. C. Pearson, K. V. L. N. Sastry, E. Herbst and F. C. De Lucia, 1994, Astrophys. J. Suppl. {\bf 93}, 589; Y. Fukuyama, H. Odashima, K. Takagi, S. Tsunekawa, 1996, Astrophys. J. Suppl. {\bf 104} 329.

The dipole moment was taken from H. M. Heise, H. Lutz, and H. Dreizler, 1974, Z. Naturforsch.~{\bf 29a}, 1345.

The methyl torsion and the $^{14}N$ hyperfine have been resolved in ethyl cyanide, but were not included in the calculation since the effects are small and usually not observable in the millimeter and submillimeter wavelengths.  For analysis see Heise {\it et al.} and D. Boucher, A. Dubrulle, J. Demaison, and H. Dreizler, 1980, Z. Naturforsch. {\bf 35a}, 1136.

Note:  The partition function in the rotational partition function for the ground state only.