From users at lists.sasview.org Tue Apr 7 05:03:44 2020 From: users at lists.sasview.org (Abitaev, Karina via users) Date: Tue, 7 Apr 2020 09:03:44 +0000 Subject: [SasView Users] Sum Multi Function Version 4.2.2 Message-ID: <7c8a480cba5e49939b4ec6a376c28df1@ipc.uni-stuttgart.de> Dear Sasview Team, I am using Sasview 4.2.2 to fit a colloidal crystal of polymer nanoparticles. Here I use a Form factor for spheres, where a polydispersity is included. Furthermore, I am using a hard sphere structure factor. I found the option to multiply the Spheres with hard spheres, so I can supply for each a radius and polydispersity. In this context I was wondering how the structure factor and form factor are combined (decoupling approximation, local monodisperse approx, ...) Thank you in advance for your help! Best wishes, Karina -- Karina Abitaev Institut für Physikalische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany karina.abitaev at ipc.uni-stuttgart.de Phone: +49 (0)711/685-64502 Fax: +49 (0)711/685-64443 -------------- next part -------------- An HTML attachment was scrubbed... URL: From users at lists.sasview.org Tue Apr 7 07:33:07 2020 From: users at lists.sasview.org (Richard Heenan - UKRI STFC via users) Date: Tue, 7 Apr 2020 11:33:07 +0000 Subject: [SasView Users] Sum Multi Function Version 4.2.2 In-Reply-To: <7c8a480cba5e49939b4ec6a376c28df1@ipc.uni-stuttgart.de> References: <7c8a480cba5e49939b4ec6a376c28df1@ipc.uni-stuttgart.de> Message-ID: Dear Karina, I think that the answer for sasview 4.2.2 is "local monodisperse", the same S(Q) is used for all radii in a polydisperse form factor. The default addition of an S(Q) ties the radius used in the S(Q) to the mean radius from the P(Q). Creating a P(Q)S(Q) product in the "plugin model" editor instead allows a different "effective radius" in the S(Q) to that from the P(Q) >From sasview 4.3 we started to add some further functionality, which is now even further improved in sasview 5 where an option to include the beta(Q) decoupling approximation is introduced. This damps out oscillations due to S(Q) to allow at least approximately for the effects of polydispersity and/or non-spherical particle shapes. Sasview 5 also allows, where appropriate, for different choices of which radius to use in the S(Q), for example for a cylinder, the half length, the radius or the diagonal radius. For greater detail I would recommend downloading sasview 5 and reading the improved documentation in that version. Regards Richard Heenan From: users [mailto:users-bounces at lists.sasview.org] On Behalf Of Abitaev, Karina via users Sent: 07 April 2020 10:04 To: users at sasview.org Subject: [SasView Users] Sum Multi Function Version 4.2.2 Dear Sasview Team, I am using Sasview 4.2.2 to fit a colloidal crystal of polymer nanoparticles. Here I use a Form factor for spheres, where a polydispersity is included. Furthermore, I am using a hard sphere structure factor. I found the option to multiply the Spheres with hard spheres, so I can supply for each a radius and polydispersity. In this context I was wondering how the structure factor and form factor are combined (decoupling approximation, local monodisperse approx, ...) Thank you in advance for your help! Best wishes, Karina -- Karina Abitaev Institut für Physikalische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany karina.abitaev at ipc.uni-stuttgart.de Phone: +49 (0)711/685-64502 Fax: +49 (0)711/685-64443 -------------- next part -------------- An HTML attachment was scrubbed... URL: From users at lists.sasview.org Tue Apr 7 07:33:07 2020 From: users at lists.sasview.org (Richard Heenan - UKRI STFC via users) Date: Tue, 7 Apr 2020 11:33:07 +0000 Subject: [SasView Users] Sum Multi Function Version 4.2.2 In-Reply-To: <7c8a480cba5e49939b4ec6a376c28df1@ipc.uni-stuttgart.de> References: <7c8a480cba5e49939b4ec6a376c28df1@ipc.uni-stuttgart.de> Message-ID: Dear Karina, I think that the answer for sasview 4.2.2 is "local monodisperse", the same S(Q) is used for all radii in a polydisperse form factor. The default addition of an S(Q) ties the radius used in the S(Q) to the mean radius from the P(Q). Creating a P(Q)S(Q) product in the "plugin model" editor instead allows a different "effective radius" in the S(Q) to that from the P(Q) >From sasview 4.3 we started to add some further functionality, which is now even further improved in sasview 5 where an option to include the beta(Q) decoupling approximation is introduced. This damps out oscillations due to S(Q) to allow at least approximately for the effects of polydispersity and/or non-spherical particle shapes. Sasview 5 also allows, where appropriate, for different choices of which radius to use in the S(Q), for example for a cylinder, the half length, the radius or the diagonal radius. For greater detail I would recommend downloading sasview 5 and reading the improved documentation in that version. Regards Richard Heenan From: users [mailto:users-bounces at lists.sasview.org] On Behalf Of Abitaev, Karina via users Sent: 07 April 2020 10:04 To: users at sasview.org Subject: [SasView Users] Sum Multi Function Version 4.2.2 Dear Sasview Team, I am using Sasview 4.2.2 to fit a colloidal crystal of polymer nanoparticles. Here I use a Form factor for spheres, where a polydispersity is included. Furthermore, I am using a hard sphere structure factor. I found the option to multiply the Spheres with hard spheres, so I can supply for each a radius and polydispersity. In this context I was wondering how the structure factor and form factor are combined (decoupling approximation, local monodisperse approx, ...) Thank you in advance for your help! Best wishes, Karina -- Karina Abitaev Institut für Physikalische Chemie Universität Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany karina.abitaev at ipc.uni-stuttgart.de Phone: +49 (0)711/685-64502 Fax: +49 (0)711/685-64443 -------------- next part -------------- An HTML attachment was scrubbed... URL: From users at lists.sasview.org Thu Apr 16 11:38:43 2020 From: users at lists.sasview.org (Stephen King - UKRI STFC via users) Date: Thu, 16 Apr 2020 15:38:43 +0000 Subject: [SasView Users] FW: theLightStuff online lecture series, lecture #3: Friday 17th, 15:30 UTC In-Reply-To: <3265758B-673A-4228-8355-3CBE010FDFDC@bam.de> References: <3265758B-673A-4228-8355-3CBE010FDFDC@bam.de> Message-ID: <874eb0c9fa9b4ebda9dac03b67a16318@stfc.ac.uk> Dear colleagues and fellow scatterers, To help break the isolation between researchers stuck at home in these pandemic times, we have set up an international online short lecture series on scattering and diffraction. The lectures normally take place on Fridays via a Zoom webinar. Details on the current schedule are here: https://www.bam.de/thelightstuff With this lecture series we hope to highlight early-career researchers (ECRs) and their projects, with talks aimed at Ph.D. students, post-docs and other ECRs. With permission of the speakers, the talks are recorded and put online as well, to broaden the access to the talks. The first two of these talks have now appeared online: https://www.youtube.com/channel/UCrFK5hLLcuDcbKmWeuJvpTw The upcoming lecture is that of Dr. Lilo Pozzo talking about time-resolved neutron scattering to elucidate molecular transport mechanisms in oil emulsions. Details on this lecture, and how to join are here: https://www.bam.de/Content/EN/Events/2020/2020-04-17-the-light-stuff-online-lectures-pozzo.html See you there on Friday the 17th! Yours sincerely Brian R. Pauw — If you have received this email outside of working hours please be assured that there is no expectation that you will reply to it outside of your normal working pattern. Bundesanstalt für Materialforschung und -prüfung (BAM) Division 6.5 - Synthesis and Scattering of Nanostructured Materials Unter den Eichen 87 12205 Berlin Germany T: + 49 30 8104-3361 F: + 49 30 8104-1617 brian.pauw at bam.de www.bam.de __________________________________________________ Die BAM ist eine Bundesoberbehörde im Geschäftsbereich des Bundesministeriums für Wirtschaft und Energie. -------------- next part -------------- An HTML attachment was scrubbed... URL: