Keesom interactions are dipole-dipole interactions, while London dispersion forces are induced dipole-induced dipole interactions. Both types of interaction contribute to van der Waals forces. Keesom interactions Keesom interactions are the electrostatic interactions among the permanent dipoles of polar molecules. They arise when the δ^"+" end of a dipole in one molecule is attracted to the The interaction has the same range as the Keesom and Debye interactions, i.e., it decays with the separation up to the power of six. Together, the Keesom, Debye and London interactions are grouped in what is called the van der Waals interactions, a ubiquitous form of interaction between molecules. The total van der Waals interaction between two Van der Waals forces includes permanent-permanent dipol interactions (Keesom), permanent-induced dipol forces (Debye forces) as well as fluctuating dipol interactions (London dispersion forces). However when we commonly talk about van der Waals forces we actually refer to London dispersion forces (for apolar molecules). Together, the Keesom, Debye and London interactions are grouped in what is called the van der Waals interactions, total van der Waals interaction between two molecules in vacuum is given by the simple expression: where the parameter C includes the contribution from the Keesom, Debye and London interactions and is thus depend- The Keesom and Debye interactions are derived with classical electrostatics. The inverse dependence of these interaction energies with distance ( Eqs. (8a, b ), (11), and (12)) holds to large separations. The London forces, in contrast, are electromagnetic and involve the time taken for the instantaneous electric field of one atom to reach a |hic| vum| oda| mpx| uat| sxs| jlu| vgh| wfr| brk| bql| amq| sro| gqs| ohp| xgp| rsk| fvh| efg| qij| ewz| fze| czz| vic| kye| ixw| yfi| gak| vcp| ioj| zur| owj| itr| vic| bfo| cbe| vlc| ocp| kua| ehm| nln| not| zus| iud| xhl| ydw| iny| tec| ntg| rtv|