\\ Species Tag:        &   69002 & Name:&  C3H7CN   
\\ Version:            &       1 & & Butyronitrile or 
\\ Date:       &  Jan. 1996      & & n-Propyl cyanide, 
\\ Contributor:&  J. C. Pearson  & & anti and gauche forms
\\             &                 & &
\\ Lines Listed:       &   60671 & Q(300.0)=&   120097.057
\\ Freq. (GHz) $<$     &    2000 & Q(225.0)=&    79160.238
\\ Max. J:             &      99 & Q(150.0)=&    41231.375
\\ LOGSTR0=            &   -10.0 & Q(75.00)=&    12254.662
\\ LOGSTR1=            &   -10.0 & Q(37.50)=&     3632.345
\\ Isotope Corr.:      &     0.0 & Q(18.75)=&     1197.204
\\ Egy. (cm$^{-1}$) $>$&0.0, 92  & Q(9.375)=&      421.579
\\ $\mu_a$ = &  3.597            & A=&  23667.8
\\ $\mu_b$ = &  0.984            & B=&   2268.1
\\ $\mu_c$ = &                   & C=&   2153.0
\headend

Butyronitrile is found in two conformers anti and gauche. The anti form
is denoted by state 0 while the gauche form is state 1.  The dipoles and
rotational constants given are for the lower energy anti form which is
about 92 cm$^{-1}$ below the gauche form.  There is no evidence of the
two forms interacting in the ground state.  Lines and dipoles were
taken from:

E. Hirota, J. Chem. Phys. {\bf 37}, 2918 (1962). J. Demaison and H.
Dreizler, Z. Naturforsch. {\bf 37a}, 199 (1982). G. Wlodarczak, L.
Martinache, J. Demaison, K.-M. Marstokk and H. Mollendal, J. Mol.
Spect. {\bf 127}, 178 (1988). K. Vormann and H. Dreizler, Z.
Naturforsch. {\bf 43a}, 338 (1988).

The gauche form has the following dipole moments $\mu_a$ = 3.272D and
$\mu_b$ = 2.139D. The quadrupole has been resolved and is presented in
Vormann {\it et at.} and Demaison {\it et al.}, above. No quadrupole was
used in this calculation.