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2. Energy per atom for argon crystal is given by

U(R) = −(A /R6 )+ (B/R12 )

where A = 1.03 ×10−77 Jm6 and B = 1.62 ×10−134 Jm12 are constants and R is the nearest

neighbour distance.

(a) Explain both expressions on the right hand side in the above equation.

(b) Determine the nearest neighbour equilibrium distance.

(c) Compare the van der Waals and repulsion between cores contributions to the energy at

the equilibrium distance.

(d) Estimate the magnitude of the van der Waals force between 2 argon atoms at

equilibrium distance, assuming that the van der Waals energy is only due to the nearest

neighbour interaction.

Thanks a lot...

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# Determine the nearest neighbour equilibrium distance

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