By S. S. Penner
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DuMond (l6, 17) has prepared the most recent review of the constants which have been adopted. The quantities are tabulated in terms of the physical mole rather than the chemical mole, and must be corrected for use in chemical calculations. OOO275, which takes into account the differing weights of the oxygen isotopes (17). Although the definition has not as yet been universally adopted, it is used here. OOOO3) X 1 0 ~ 1 2 ergs (I7) Using these conversion factors, the chemical constants employed at Rocketdyne are compared with those previously proposed by the NACA (9).
The previous approximate results were often quite adequate to guide earlier rocket development work. However, the most accurate performance calculations possible are required to help guide propellant selection and thrust chamber design for the far more exacting rocket engine requirements of the present and future. For several years, the Theoretical Chemistry Unit of the Rocketdyne Research Subdivision has maintained a continuing effort to determine con sistent and accurate theoretical performance values.
The exponent d. in the partition function is the degree of degeneracy, including accidental degeneracy, of the ith vibrational frequency (23). The above equations define the thermodynamic functions of monatomic, diatomic, and polyatomic molecules by means of the additive contribu tions of the translational, electronic, rotational, and vibrational func tions for the rigid rotator, harmonic oscillator model. The energy lev els and multiplicities for all of the monatomic gases computed to date have been taken from Moore (24).