کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5410513 1506558 2015 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reverse Monte Carlo investigations concerning recent isotopic substitution neutron diffraction data on liquid water
ترجمه فارسی عنوان
معکوس مونت کارلو در مورد داده های اخیر پراکندگی جایگزین ایزوتوپ نوترون در آب مایع
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
چکیده انگلیسی
Although liquid water has been studied for many decades by (X-ray and neutron) diffraction measurements, new experimental results keep appearing, virtually every year. The reason for this is that neither X-ray nor neutron diffraction data are trivial to correct and interpret for this essential substance. Since X-rays are somewhat insensitive to hydrogen, neutron diffraction with (most frequently, H/D) isotopic substitution is vital for investigating the most important feature in water: hydrogen bonding. Here, the two very recent sets of neutron diffraction data are considered, both exploiting the contrast between light and heavy hydrogen, 1H and 2H, in different ways. Reverse Monte Carlo structural modeling is applied for constructing large structural models that are as consistent as possible with all experimental information, both in real and reciprocal spaces. The method has also proven to be useful for revealing where possible small inconsistencies appear during primary data processing: for one neutron data set, it is the molecular geometry that may not be maintained within reasonable limits, whereas for the other set, it is one of the (composite) radial distribution functions that cannot be modeled at the same (high) level as the other three functions. Nevertheless, details of the local structure around the hydrogen bonds appear very much the same for both data sets: the most probable hydrogen bond angle is straight, and the nearest oxygen neighbors of a central oxygen atom occupy approximately tetrahedral positions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Liquids - Volume 212, December 2015, Pages 111-116
نویسندگان
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