\\ Species Tag:        &   42001 & Name:&  CH3CN-15          
\\ Version:            &       3 & & Acetonitrile,
\\ Date:       &  Decemeber 2009 & & $^{15}$N isotope
\\ Contributor:&  H.S.P. M\"uller  & & 
\\             &                 & & 
\\ Lines Listed:       &    1351 & Q(300.0)=&    10431.9556
\\ Freq. (GHz) $<$     &    1683 & Q(225.0)=&     6774.2565
\\ Max. J:             &      95 & Q(150.0)=&     3687.1996 
\\ LOGSTR0=            &    -5.5 & Q(75.00)=&     1304.3662 
\\ LOGSTR1=            &    -6.5 & Q(37.50)=&      462.9618 
\\ Isotope Corr.:      &  -2.448 & Q(18.75)=&      169.3765
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&       66.0537
\\ $\mu_a$ = & 3.9256(7)         & A=& 158099.0
\\ $\mu_b$ = &                   & B=&   8922.0
\\ $\mu_c$ = &                   & C=&   B
\headend 

This entry is a combined CDMS and JPL entry.
The latest combined fit has been reported by
(1) H. S. P. M\"uller; B. J. Drouin, and J. C. Pearson, 2009, Astron. Astrophys. 506, 1487.
This work provides new data between 338 and 1192 GHz. Additional data were taken from
(2) J. C. Pearson and H. S. P. M\"uller, 1996, Astrophys. J. 471, 1067;
and from
(3) J. Demaison, A. Dubrulle, and D. Boucher, 1979, J. Mol. Spectrosc. 76, 1;
from
(4) A. Bauer, 1975, J. Mol. Spectrosc. 58, 111;
and from
(5) J. Haekel and H. M\"ader, 1989, J. Quant. Spectrosc. Radiat. Transfer 41, 9.
The purely K-dependent terms A and D$_K$ were assumed to agree with those of the main isotopolog, see d041001.cat.
The predictions are probably reliable throughout.
Note: Vibrational contributions have not been considered in the calculation of the partition function yet. Rough estimates may be obtained by scaling the respective ground state value with the ratio from the main isotopolog.
At low temperatures, it may be necessary to discern between A-CH$_3$C$^{15}$N and E-CH$_3$C$^{15}$N. The A state levels are described by $K = 3n$, those of E state by $K = 3n \pm 1$. The nuclear spin-weight ratio is 2 : 1 for A-CH$_3$C$^{15}$N with $K > 0$ and all other states, respectively. The $J_K$ = 1$_1$ level is the lowest E state level. It is 5.5711 cm$^{-1}$ above ground.
The dipole moment was reported by
(6) A. Mito, J. Sakai, and M. Katayama, 1984, J. Mol. Spectrosc. 103, 26.