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Re: [sdpd] Hump ???

bonjour, 
j'ai passé ma poudre organique 12 heures à fin de faire l'affinement de sa structure par la méthode de Rietveld, le système cristallin est monoclinique, je trouve que cette durée n'est pas suffisabte pour faire un tel affinement ( je n'ai pas pu faire une longue durée car on a le problème du diffractomètre).
la modélisation été difficile mais je me demande est-ce-que je devrai faire les corrections systématique avant de faire l'affinement?
en outre ma poudre as plusieures granulométries, est-ce-qu'il est possible de comparer entres les differents spèctres(1heure pour chaque taille) ?quel est l'effet de taille ?
s'il est posible de m'envoyer des documents pour la préparation des échantillons car j'on ai besoin.
 
 j'attend votre réponse et merci.

Armel Le Bail <alb...@cristal.org> wrote:

>P.S. Why do you measure at nights only &shy; to exclude the sun wind
>influence? :)

In fact I measure during 24 hours... There is no queue (we
have 2 other diffractometers). The problem is there since
more than 1 year and we have made nothing serious
(I say "we" but I should say the lab tinkers, not including
me, because I am notoriously unable to repair something,
even not a spigot...). I try to slow down the complete failing
of the French science with my own limited capacity ;-).
And even Bruker seems to have limited capacity on that
question. Probably corrosion somewhere close to the
X-ray tube because of too powerful cooling and air moisture...

Thanks for all the suggestions ! I will make a report if "we"
find the explanation.

Armel


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