\\ Species Tag:        &   81001 & Name:&  Cl-35-NO2
\\ Version:            &       1 & & Nitryl chloride,  
\\ Date:       &  May   1996     & & $^{35}$Cl isotope
\\ Contributor:&  H. S. P.  M\"uller & & 
\\             &                 & & 
\\ Lines Listed:       &    3520 & Q(300.0)=&    87532.1324
\\ Freq. (GHz) $<$     &     600 & Q(225.0)=&    55251.5340
\\ Max. J:             &      80 & Q(150.0)=&    29375.3141
\\ LOGSTR0=            &   -10.6 & Q(75.00)=&    10285.6424
\\ LOGSTR1=            &    -7.3 & Q(37.50)=&     3637.3396
\\ Isotope Corr.:      &  -0.122 & Q(18.75)=&     1287.8512
\\ Egy. (cm$^{-1}$) $>$&     0.0 & Q(9.375)=&      456.7436
\\ $\mu_a$ = & 0.53 $\pm$ 0.01   & A=& 13290.137
\\ $\mu_b$ = &                   & B=&  5175.4968
\\ $\mu_c$ = &                   & C=&  3719.5377
\headend 

The ground state microwave and millimeter wave data were taken from 
(1) T. Oka and Y. Morino, 1963, J. Mol. Spectrosc. {\bf 11}, 349; and 
(2) R. R. Filgueira, P. Forti, and G. Corbelli, 
1975, J. Mol. Spectrosc. {\bf 57}, 97. Hyperfine splittings were not 
taken into account.

Also included in the fit are several infrared transitions: 
(3) $\nu_4$ at 1684 cm$^{-1}$, J. Orphal, M. Morillion-Chapey, and G. Guelachvili,
1994, J. Mol. Spectrosc. {\bf 165} 315;
(4) $\nu_1$ at 1282 and $2\>\nu_6$ at 1305 cm$^{-1}$ (Fermi resonance), 
J. Orphal, G. Guelachvili, and M. Morillion-Chapey, 
1994, J. Mol. Spectrosc. {\bf 166} 280; 
(5) $\nu_3$ at 370 cm$^{-1}$ and $\nu_2$ at 793 cm$^{-1}$, 
J. Orphal $et \ al.$, to be published.
 
The dipole moment is from D. F. Eagle, T. L. Weatherly, and Q. Williams, 
1966, J. Chem. Phys. {\bf 44}, 847.
It should be noted that a dipole moment of 0.42 $\pm$ 0.01 D was reported by 
D. J. Millen and K. M. Sinnot, 1958, J. Chem. Soc., 350. This value 
is based on a much smaller data set and seems to be less reliable.

The partition function has been calculated up to $J$ = 99  
because of the low rotational constant. The vibrational 
states used in the fit were also used in the calculation of 
the partition function. It should be noted that these are not all 
(low-lying) modes that occur.