@timgould_scienc @qchemprof One can’t combine C6*R^{-6} and C7*R^{-7} (independent terms in multipole expansions having different R and angular dependences) by your shift. In the lecture I attended the only terms discussed were isotropic Cn*R^{-n} with n=6
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@qchemprof They are important. They are 0 for atoms in S states and in rotational averaging; otherwise must be included. For theory: https://t.co/Si0AfNeJnQ, https://t.co/oLXFgEmBJ4, https://t.co/7eiOlfCnTr, https://t.co/7jIZQ9wMto. Examples: https://t.co/
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I used my PhD dissertation as a starting point for writing a comprehensive review published as an invited book chapter https://t.co/7jIZQ9wMto (in a star-studded company of authors in a nice four-volume book series). I regard this as one of the best things