\\ Species Tag: & 4001 & Name:& H2D+ \\ Version: & 2 & & \\ Date: & Jan. 2010 & & \\ Contributor:& B. J. Drouin & & \\ & & & \\ Lines Listed: & 32 & Q(300.0)=& 76.4529 \\ Freq. (GHz) $<$ & 7550 & Q(225.0)=& 49.9615 \\ Max. J: & 5 & Q(150.0)=& 27.5467 \\ LOGSTR0= & -7.2 & Q(75.00)=& 9.7322 \\ LOGSTR1= & -3.4 & Q(37.50)=& 3.1037 \\ Isotope Corr.: & -3.347 & Q(18.75)=& 1.2151 \\ Egy. (cm$^{-1}$) $>$& 0.0 & Q(9.375)=& 1.0037 \\ $\mu_a$ = & 0.6 & A=&1302323.7 \\ $\mu_b$ = & & B=& 873563.25 \\ $\mu_c$ = & & C=& 497767.19 \headend The frequency fit included rotational lines measured by Saito {\it et al.}, 1985, J. Chem.~Phys.~{\bf 82}, 45; Amano and Hirao J. Molec. Spectrosc. 233, 7-15 (2005); Asvany et al. Phys. Rev. Lett. 100, 233004 (2008); and Yonezu et al. J. Molec. Spectrosc. 256, 238-241 (2009 Infrared combination differences from Polyansky \& Tennyson, J. Chem. Phys. 110, 5056-5064 (1999). This entry follows the analysis of Yonezu et al. closely. The partition function was calculated by predicting up to J = 25, increasing the prediction beyond J = 25 did not alter the value at 300 K.