## Abstract

Vapor phase 2nd virial coefficient isotope effects (VCIE's) are interpreted. A useful correlation is developed between -Δ(ℬ-b_{o})/(ℬ-b_{o}) = (-VCIE) and the reference condensed phase reduced isotopic partition function ratio [ln(f_{c}/f_{g})]*. ℬ is the second virial coefficient, b_{o} = 2πσ^{3}/3, σ is the Lennard-Jones size parameter, and Δ is an isotopic difference, light-heavy. [ln(f_{c}/f_{g})]* can be obtained from vapor pressure isotope effects for T/T_{CRITICAL} < 0.7. Also (-VCIE) = ln(f_{p}/f_{g}^{2}), where ln(f_{p}/f_{g}^{2}) is the reduced isotopic partition function ratio describing the equilibrium between monomers and interacting pairs. At temperatures well removed from crossovers in ln(f_{p}/f_{g}^{2}) or [ln(f_{c}/f_{g})]*, ln(f_{p}/f_{g}^{2}) = (0.4±0.2) [ln(f_{c}/f_{g})]*.

Original language | English |
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Pages (from-to) | S47-S51 |

Journal | Nukleonika |

Volume | 47 |

Issue number | SUPPL.1 |

Publication status | Published - 1 Dec 2002 |

Event | International Conference on an Istope Odyssey - Zakopane, Poland Duration: 24 Jun 2001 → 29 Jun 2001 |

## Keywords

- Isotope effects
- Lennard-Jones potential
- Reduced partition function ratio
- Vapor phase
- Vapor pressure isotope effects
- Virial coefficients