The Periodic Table

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12:05 AM

in Spring Cleaning, 8 hours ago, by Gaurang Tandon

@Martin-マーチン whoa. what do we infer from that? That we've had a number of very specific conceptual queries over the years, but we've been closing them all. I have changed my mind over the past month - when my eyes opened as I read our tour page - our aim should be to be a detailed library of every question about Chemistry, and that each question should have some long-term value. So i'm all in for such a transition from the current policy to a conceptual one, at least even as a part of an experiment

Does any other user concur with this.

I do

M.A.R. ಠ_ಠ

12:30 AM

I maybe do

This self Q&A post is an attempt to revive the RFCP initiative. Here is the corresponding request by Ben Norris. — Gaurang Tandon yesterday

@Gau, I dunno, maybe I should add something like this to my intro to OS post?

2 hours later…

pentavalentcarbon

2:06 AM

@obackhouse If the MO indices run over the same ranges, like $(pq|rs)$, then yes.

1 hour later…

Gaurang Tandon

3:29 AM

@M.A.R.ಠ_ಠ it's too late though, and your post came before the RFCP, so guess nope. that and that comment really has had no effect whatsoever that I was hoping for. I was hoping for at least three more RFCP requests, but there are none yet :(

4 hours later…

Gaurang Tandon

7:19 AM

When I paste this Chemistry article's DOI (10.1070/RC1981v050n06ABEH002650) in SciTub, I get access to a physics paper instead. Anyone knows what's going on? Why does it resolve the DOI to a wrong paper?

Interestingly, that physics paper has a different DOI :/

Avnish Kabaj

7:43 AM

@GaurangTandon try downloading that physics paper

And see what happens

Gaurang Tandon

@AvnishKabaj it will obviously download the physics paper xD

Avnish Kabaj

@GaurangTandon you never know

iopscience.iop.org/0305-4470/12/3/012

Gaurang Tandon

@AvnishKabaj what? that is still a link to a physics paper :/

Martin - マーチン

8:37 AM

@GaurangTandon SciTub?

Gaurang Tandon

@Martin-マーチン ...Hub ;) (using a different name so that it doesn't appear in search results...)

Martin - マーチン

ah, ok

Not a conceptual question: Chemistry Mole concept Question

Gaurang Tandon

@Martin-マーチン definitely agree

Martin - マーチン

How many buzzwords can you fit into the title though?

Gaurang Tandon

@Martin-マーチン "Confusing chemistry exam question on mole concept please help!" ;P

Martin - マーチン

8:44 AM

you forgot doubt - that's an important one

Gaurang Tandon

oh, right. "Confusing chemistry exam question on titration experiment, please help with this doubt!"

sounds complete

4 hours later…

Gaurang Tandon

1:13 PM

@santimirandarp If you give an example of your "map of nomenclature", I'll be more than happy to make due adjustments

user280247

1:33 PM

I'll do a draft and send it to you. Not today though @GaurangTandon

obackhouse

2:07 PM

@pentavalentcarbon in which contexts could they run over different ranges?

pentavalentcarbon

2:48 PM

@obackhouse The first example that comes to mind is MP2; you need $(ia|jb)$ and $(ij|ab)$, which are $(ov|ov)$ and $(oo|vv)$, respectively.

When you do a piece-wise AO-to-MO transformation, they also have reduced symmetry, say $(\mu\nu|rs)$, which would be $(bb|aa)$, where $b$ is all AOs and $a$ is all MOs.

And only twofold symmetry for $(\mu\nu|jb)$, which is $(bb|ov)$.

Right?

I think you encounter $(oo|ov)$ and $(ov|vv)$ in CCSD(T)

Gaurang Tandon

3:16 PM

@santimirandarp sure, whenever

obackhouse

3:51 PM

@pentavalentcarbon I think I'm getting a little confused by the notation actually

are $\mu\nu$ equivalent to $ij$?

or is $ij$ for MO basis only?

Gaurang Tandon