\\ Species Tag:        &   56008 & Name:&  C2H3CHO    
\\ Version:            &       1 & & s-trans and s-cis Acrolein
\\ Date:       &  Jan. 1996      & & 
\\ Contributor:&  J. C. Pearson  & & 
\\             &                 & & 
\\ Lines Listed:       &   24051 & Q(300.0)=&    19562.548 
\\ Freq. (GHz) $<$     &    2000 & Q(225.0)=&    13737.474 
\\ Max. J:             &      50 & Q(150.0)=&     7922.005 
\\ LOGSTR0=            &    -8.0 & Q(75.00)=&     2856.363 
\\ LOGSTR1=            &    -8.5 & Q(37.50)=&     1010.200 
\\ Isotope Corr.:      &         & Q(18.75)=&      357.654 
\\ Egy. (cm$^{-1}$) $>$&0.0, 594 & Q(9.375)=&      126.904 
\\ $\mu_a$ = & 3.052             & A=& 47353.7
\\ $\mu_b$ = & 0.630             & B=&  4659.5
\\ $\mu_c$ = & 0                 & C=&  4242.7
\headend 

Acrolein exists in two stable conformers, s-trans and s-cis. 
The s-trans state is more stable by 594 cm$^{-1}$. The dipole moments 
and rotational constants given are for the s-trans conformer.  

The s-trans experimental measurements were taken from: R. Wagner, J.
Fine, J. W. Simmons and J. H. Goldstein, J. Chem. Phys. {\bf 26}, 634
(1957). E. A. Cherniak and C. C. Costain, J. Chem. Phys. {\bf 45}, 104
(1966). M. Winnewisser, G. Winnewisser, T. Honda and E. Hirota, Z.
Naturforsch. {\bf 30a}, 1001 (1975).

The dipole moments and measurements for the s-cis state come from: C. E.
Blom and A. Bauder, Chem. Phys. Lett. {\bf 88}, 55 (1982). C. E. Blom,
G. Grassi and A. Bauder, J. Am. Chem. Soc. {\bf 106}, 7427 (1984).

The s-trans levels are denoted as state 0 and s-cis is state 1. The dipole
moments for the s-cis form are $\mu_a$ = 2.010D and $\mu_b$ = 1.573D.