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(a) Reference system: M = 7 sites in a circle; three sites are occupied by molecules. Nearest-neighbor occupied sites have an interaction energy w. ξ0 is the grand partition function. (b) M = 7 sites with an adsorbent molecule ⊗ at each end. The interaction energy between ⊗ and an occupied adjacent site is w′. (c) M = 7 sites with two free ends (no adsorbent). (d) M = 7 sites with one free end and an adsorbent at the other end.
