iFunc_Sqw2D: create 'LEAPR' models

McStasMcXtrace / iFit

a simple library to analyze data (with McCode and Phonons/DFT hooks). :warning: this project has been moved to https://gitlab.com/soleil-data-treatment/soleil-software-projects/remote-desktop

http://ifit.mccode.org

Other

5 stars 5 forks source link

iFunc_Sqw2D: create 'LEAPR' models #147

Closed farhi closed 5 years ago

farhi commented 6 years ago

This depends on Sjolander multi phonon approx #125

farhi commented 6 years ago

And Schofield paper with Vineyard S(a,b)

farhi commented 5 years ago

also implement Egelstaff and Schofield in attached report from E. Guarini same for Vineyard See: https://github.com/McStasMcXtrace/iFit/files/1314132/CRISP.WP11.T2.-.technical.report.pdf

farhi commented 5 years ago

On going work. Not so easy for unit conversions...

sqw_egelstaff.m.txt

farhi commented 5 years ago

Few comments from an earlier LEAPR work port to matlab, and related doc.

198801001570.pdf indc-nds-0470.pdf LA-12639-LEAPR-MacFarlane-199426027423.pdf leapr.m.txt thermal.pdf

farhi commented 5 years ago

Can use models (see LA-12639-MS or 'thermal' report):

short collision time approx (SCT)
free gas
recoil

which are all similar in fact, with rescaling of axes.