Re: HiCANS (Hight Current Accelerator-driven Neutron Source)

Hi Alan, Accelerator-driven neutron sources are a lot cheaper than spallation sources. Moreover, Figure 54 in the ICONE document shows that the scientific productivity of neutron sources does not depend on the flux of the source. And the biggest point might be the return to building new neutr

Re: structure solution terminology

Hi Lubo, if we speak of diffraction, we have a Fourier transformation, so we are not 100% in the direct space with any structure solution method. However, the "structure solution in direct space" does not attempt to work in the reciprocal space - all the manipulations are done in the direct space

Re: Cyberstar hot air blowers

lto : radovan.ce...@unige.ch URL    : http://www.unige.ch/sciences/crystal/cerny/rcerny.htm   De : alan.he...@gmail.com [mailto:alan.he...@gmail.com] De la part de Alan Hewat Envoyé : vendredi 3 juillet 2015 12:15 À : Yaroslav Filinchuk UCL Cc : SAJ Kimber; rietveld_l@ill.fr Objet : Re: Cyberstar hot ai

Re: Cyberstar hot air blowers

Title: Re: Cyberstar hot air blowers Hello Simon, we are successfully using a programmable hot air blower (25-750°C) called Le Mini Sensor Kit 800, from the Swiss company Leister. It costs about 2000 CHF, and is aimed at the industrial use. It allows to do ramps, it follows the protocol very clo

Re: chi^2 smaller one

Dear Christina, Chi2 may be small because of a high noise, so it indicates that the model is over-refined with respect to the quality of the data (quick collection using analyzer crystal). This is a trivial case and you can't help it. The other (more likely) option is that you have low-noise dat

Re: diffraction patterns or spectra

iffractogram' are now represented by a spectrum of values, like a diagonalised matrix. Needless to say that in many cases FT is standing between us and the physics and a spectrum we see does not represent (directly!) a picture of the physics behind any more. Lubo On Fri, 12 Feb 2010, Yaroslav

Re: diffraction patterns or spectra

Title: Re: diffraction patterns or spectra Dear Brian, to me spectroscopy sounds as a technique were an energy spectrum is used,  i.e. the light of different energies  has a different absorption coefficient (IR), or there is a different energy transfer for a fixed wavelength (Raman, INS, IXS). X

Re[2]: Preferred orientation?

Dear Martin, What is called "texture" in the link you've provided actually is a "bad powder average". Texture sounds to me as a rather general term, while "preferred orientation" is its particular case. Texture is the distribution of crystallographic orientations in a polycryst

Re: Preferred orientation?

Dear Gerard, The low-angle intensity problem might come from disordered regions, like water or solvent molecules occupying some voids. Also, poor modeling of weakly scattering atoms, like hydrogen, may lead to the similar problem. Best regards, Yaroslav http://filinchuk.com ===

Re: Removal of redundant/symmetry equivalent reflections

You can merge the equivalents using Xprep. ===8<==Original message text=== Dear All Does anyone know a program for removing redundant and/or symmetry-equivalent reflections from single crystal datasets (typically hkl-files: h k l intensity)? Such data is necessary for th

Re: indexing problem

, Yaroslav Filinchuk AvdL> Dear all, AvdL> It is generally assumed that a high value of the M20 index gives a AvdL> high probability that the solution is correct. I have a particular AvdL> problem for which I have a couple of different solutions with M20 AvdL> between 40 and 100. The pro

Re: Defining the origin of P2/n

Dear Peter, the most correct constraint would be to fix a sum of coordinates of all atoms along polar axis, but not only of the first two. It gives the best estimation of the standard uncertainties. Yaroslav Filinchuk PZ> Bob, PZ> Thank you for the clarification. I never had

Re: background in Fullprof?

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