Frédéric A. Perras
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fredaperras.bsky.social
Frédéric A. Perras
@fredaperras.bsky.social
NMR Spectroscopist. Staff Scientist at Ames National laboratory and Adjunct Associate Professor at Iowa State University. Opinions are my own.
Those fits to the CP build-up curves are incredible. Very nice.
October 31, 2025 at 9:25 PM
Sorry to hear that. I hope you get better soon.
September 23, 2025 at 7:56 PM
I will die on this hill; lacquer is the superior finish. Spray on, always perfect, ready to recoat basically after you are done spraying the last one.
September 22, 2025 at 2:08 PM
For the second point, Ln(III) cations are largely chemically identical. Their f orbitals behave as core orbitals and do not participate in bonding. So while the total spin and orbital angular momentum will change, the bonding and spin density functions should be close to the same.
September 5, 2025 at 4:37 PM
I am about as far from being an expert as there is, but regarding point 1, the Fermi contact interaction required spin density exactly on the nucleus. So it basically measures the amount of of the spin density function that is made up of that atom's s orbitals.
September 5, 2025 at 4:35 PM
Love it!
August 28, 2025 at 3:32 PM
Twitter used to be nice, and then most of the posts I was seeing were promoted posts and ads. When I quit "X" and created a bluesky account it was such a breath of fresh air and quite reminiscent of what Twitter was like when I decided to join to find and promote papers.
August 20, 2025 at 10:19 PM
I have not tried it but these stores I read make me wonder why Bruker goes out of their way to avoid using Redhat. Redhat costs about the same as windows. On an instrument that typically costs over $1M... Agilent would just give you a Redhat workstation.
August 8, 2025 at 10:13 PM
On the downside, now, syncing with the file system used to be instantaneous and now it takes a very measurable amount of time. Quite a strange choice.
June 23, 2025 at 9:57 PM
Really? I am pretty sure I did do this, but maybe I am misremembering.
June 23, 2025 at 9:56 PM
Topspin has a search now? What is the use case?

I still think that topspin 1.3 was peak Topspin.
June 23, 2025 at 9:49 PM