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Post AixNRkIGTi1ZbhsHo0 by [email protected] |
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More posts by [email protected] |
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Post #Aiwp9faHqs5NLbVtbs by [email protected] |
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Even though helium is the least reactive of the noble gases, you can make a mol… |
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Post #Aiwqx9tQ3ONZUXcm3c by [email protected] |
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For more on the helium dimer, check out this:https://en.wikipedia.org/wiki/Heli… |
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Post #Aiww5FAeoV2bwsMVO4 by [email protected] |
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@johncarlosbaez There is also the very well studied Lennard-Jones potential, wh… |
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Post #Aix72aaVpP5z01ONlo by [email protected] |
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@dduque - does πβ»ΒΉΒ² repulsion make this law easier to work with than οΏ½… |
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Post #Aix8oh17KOGanEL0vQ by [email protected] |
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@johncarlosbaez Is there a not too difficult explanation for the 1/r^6? |
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Post #Aix8oh7UwfN371K6s4 by [email protected] |
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@tian - in my second post I asked for a not too difficult explanation of the 1/… |
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Post #Aix9UMJAiGTwjDePB2 by [email protected] |
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@johncarlosbaez looking at the animation, you end up with two He atoms with the… |
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Post #Aix9UMPYKXaP30dV7g by [email protected] |
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@isomer wrote: "looking at the animation, you end up with two He atoms wit… |
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Post #AixASeSIN4pmNyfTMW by [email protected] |
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@johncarlosbaezObviously I'm no expert, but Lennard-Jones' paper *Cohes… |
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Post #AixASeYK0feegfUHku by [email protected] |
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@codrusofathens - It means something to me: it means "do the usual sort of… |
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Post #AixAT6zEIDocsEIAaG by [email protected] |
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@johncarlosbaez I *think* it comes from the multipole expansion of the field in… |
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Post #AixDlwY3csCLrfFnQu by [email protected] |
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@johncarlosbaez There is the folklore that the exponent of 12 is indeed just c… |
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Post #AixEjePuARLB0PuYgy by [email protected] |
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@johncarlosbaez itβs too early for me to do anything but skim this reference,… |
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Post #AixHrij4KVsEY7Pl1U by [email protected] |
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@weekend_editor - I think multipole expansions are part of the story. I know t… |
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Post #AixI3Zn3NWmkJJvomG by [email protected] |
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@dduque - thanks! I'll check out these references. |
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Post #AixIDA027e71DaZZTc by [email protected] |
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@4raylee - that's the beginning of a good story for 1/πβΆ. All the ha… |
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Post #AixJ5Aett67otrRTzk by [email protected] |
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@johncarlosbaez the hard work is in the linked PDF. Iβm merely summarizing pr… |
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Post #AixJFaOF4edrbGcIiW by [email protected] |
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@4raylee - okay, thanks - I'll check it out. I need coffee too, but this i… |
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Post #AixNRkIGTi1ZbhsHo0 by [email protected] |
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@johncarlosbaez The interesting thing (imho) is that the LJ potential defines a… |
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Post #AixcIkn8kvjNrFUEfw by [email protected] |
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@johncarlosbaez @tian I think the problem is that classically the helium atom m… |
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Post #AixhCvRwiRSuwlc6QS by [email protected] |
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@BartoszMilewski - I think you tend to give up too easily due to your overall p… |
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Post #AixkjKTZVJahh3W6QC by [email protected] |
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@johncarlosbaez My idea would be to model the classical helium atom as two elec… |
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Post #Aixky6b1OJoyzQ2zCq by [email protected] |
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@BartoszMilewski - that sounds good! By the way, this quantum treatment found… |
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Post #AizVNdWUtdqZOs0FyS by [email protected] |
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@dduque @johncarlosbaez 12 is arbitrary, but does have some conveniences. Via A… |
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Post #AizVNdcsVux1iezLv6 by [email protected] |
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@dduque @johncarlosbaez (2/2)" We emphasize that the precise form of the p… |
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Post #AizVNdiCC9Cjz9TbCy by [email protected] |
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@dduque @johncarlosbaez (It also gives a quick hand-wavey explanation for the … |
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Post #AizVRUy4e8uo1bk9dg by [email protected] |
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@Arianity @johncarlosbaez I didn't remember that Ashcroft & Mermin cove… |
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Post #AizVRV46HjjgKIYy24 by [email protected] |
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@dduque @Arianity - Thanks! I will probably try to write a blog article on the… |
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Post #AizZlk5uW426XyJkJc by [email protected] |
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@johncarlosbaez @tian @BartoszMilewski I am a physics amateur, but I feel like … |
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Post #AizdEFtMBecP8UjWFc by [email protected] |
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@pschwahn - a lone helium atom in its ground state is neutral and spherically s… |
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Post #Aj09z1kZmPvPQ6yLya by [email protected] |
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@johncarlosbaez I'm a bit lost in this thread. Is πβ»β· *not* the rig… |
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Post #Aj0qRBNTm6T7SjHEyu by [email protected] |
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@peri - hah, you're right! I thought the textbook answer for the van der … |
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Post #Aj0szjsYCs8YDhPr9s by [email protected] |
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@johncarlosbaez @BartoszMilewski @4raylee It's been fun following this thre… |
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Post #Aj0szjyvp9F0XUOx6W by [email protected] |
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@davidruffner - hah, that's great! Someone else pointed this out. I thoug… |
