Good morning Jose, The devil is always on the detail:- You are of course correct that I had presumed, as Ethan pointed out, a sub 10 fsec pulse.
Neutrons creating magnetic waves, you are again correct, “spin echo“ does occur, but without damage though as neutrons have such gentle energies versus Xray photons. In re reading my “treading through the terminology carefully” email (hinting at “going where Angels fear to tread“) I had substituted d spacing for resolution, the latter term able to raise lengthy debates, which I sought to avoid, but should have changed low to large to read “large d spacings”. Apologies to all. So, this lockdown is giving us time for considering such issues.... Sam Horrell, Andrea Thorn and Dale Tronrud have been have carefully preparing via twitterdebate, and including a written document, their suggested options to resolve the issue of what to do in our pdb coordinate files where there is insufficient electron density for very mobile side chains. Over to you Sam, Andrea and Dale..... Greetings, John Emeritus Professor John R Helliwell DSc > On 2 Jul 2020, at 02:51, Jose Brandao-Neto <jose.brandao-n...@diamond.ac.uk> > wrote: > > Hi Ian, good to hear! Hi everyone, thanks for the etymological - and > etiological - discussion. I'm good whatever the choice. > > John, I beg to differ with the absolute statement that xfels offer damage > free hkls - back in 2016 yet another great experimental work, by Inoue et al > (https://www.pnas.org/content/113/6/1492), showed global loss of diffraction > in a protein crystal analog as soon as 10 fs from exposure start (later > estimated in Mx experiments by I. Schlichting's team). > > Cheers, > José > -> Digression: And I expect neutrons will do a similar job exciting the > crystal with some phonon-magnetic moment coupling and changing the > magnetisation state of the electronic structure pretty fast. > -> Digressing even further, this might be a mechanism that underpins > allosteric effects, so neutron mx might be a way to tease them. > > ######################################################################## > > To unsubscribe from the CCP4BB list, click the following link: > https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 > > This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a mailing > list hosted by www.jiscmail.ac.uk, terms & conditions are available at > https://www.jiscmail.ac.uk/policyandsecurity/ ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a mailing list hosted by www.jiscmail.ac.uk, terms & conditions are available at https://www.jiscmail.ac.uk/policyandsecurity/
