<Table> <Tr> <Td> <P> U (z; R 1, R 2) = − A 6 (2 R 1 R 2 z 2 − (R 1 + R 2) 2 + 2 R 1 R 2 z 2 − (R 1 − R 2) 2 + ln ⁡ (z 2 − (R 1 + R 2) 2 z 2 − (R 1 − R 2) 2)) (\ displaystyle (\ begin (aligned) &U (z; R_ (1), R_ (2)) = - (\ frac (A) (6)) \ left ((\ frac (2R_ (1) R_ (2)) (z ^ (2) - (R_ (1) + R_ (2)) ^ (2))) + (\ frac (2R_ (1) R_ (2)) (z ^ (2) - (R_ (1) - R_ (2)) ^ (2))) + \ ln \ left ((\ frac (z ^ (2) - (R_ (1) + R_ (2)) ^ (2)) (z ^ (2) - (R_ (1) - R_ (2)) ^ (2))) \ right) \ right) \ end (aligned))) </P> </Td> <Td> <Table> <Tr> <Td> <P> </P> </Td> <Td> <P> </P> </Td> <Td> <P> </P> </Td> </Tr> <Tr> <Td> <P> </P> </Td> </Tr> </Table> </Td> <Td> <P> (1) </P> </Td> </Tr> </Table> <Tr> <Td> <P> U (z; R 1, R 2) = − A 6 (2 R 1 R 2 z 2 − (R 1 + R 2) 2 + 2 R 1 R 2 z 2 − (R 1 − R 2) 2 + ln ⁡ (z 2 − (R 1 + R 2) 2 z 2 − (R 1 − R 2) 2)) (\ displaystyle (\ begin (aligned) &U (z; R_ (1), R_ (2)) = - (\ frac (A) (6)) \ left ((\ frac (2R_ (1) R_ (2)) (z ^ (2) - (R_ (1) + R_ (2)) ^ (2))) + (\ frac (2R_ (1) R_ (2)) (z ^ (2) - (R_ (1) - R_ (2)) ^ (2))) + \ ln \ left ((\ frac (z ^ (2) - (R_ (1) + R_ (2)) ^ (2)) (z ^ (2) - (R_ (1) - R_ (2)) ^ (2))) \ right) \ right) \ end (aligned))) </P> </Td> <Td> <Table> <Tr> <Td> <P> </P> </Td> <Td> <P> </P> </Td> <Td> <P> </P> </Td> </Tr> <Tr> <Td> <P> </P> </Td> </Tr> </Table> </Td> <Td> <P> (1) </P> </Td> </Tr> <P> U (z; R 1, R 2) = − A 6 (2 R 1 R 2 z 2 − (R 1 + R 2) 2 + 2 R 1 R 2 z 2 − (R 1 − R 2) 2 + ln ⁡ (z 2 − (R 1 + R 2) 2 z 2 − (R 1 − R 2) 2)) (\ displaystyle (\ begin (aligned) &U (z; R_ (1), R_ (2)) = - (\ frac (A) (6)) \ left ((\ frac (2R_ (1) R_ (2)) (z ^ (2) - (R_ (1) + R_ (2)) ^ (2))) + (\ frac (2R_ (1) R_ (2)) (z ^ (2) - (R_ (1) - R_ (2)) ^ (2))) + \ ln \ left ((\ frac (z ^ (2) - (R_ (1) + R_ (2)) ^ (2)) (z ^ (2) - (R_ (1) - R_ (2)) ^ (2))) \ right) \ right) \ end (aligned))) </P> <Table> <Tr> <Td> <P> </P> </Td> <Td> <P> </P> </Td> <Td> <P> </P> </Td> </Tr> <Tr> <Td> <P> </P> </Td> </Tr> </Table>

Definition of van der waals forces in chemistry