| Автор | Yu N Ivanov |
| Автор | J Totz |
| Автор | D Michel |
| Автор | G Klotzsche |
| Автор | A A Sukhovsky |
| Автор | I P Aleksandrova |
| Дата выпуска | 1999-05-10 |
| dc.description | Processes of chemical exchange of deuterons in partially deuterated ammonium hydrogen selenate, NH<sub>4</sub>HSeO<sub>4</sub> (AHSe), crystals are investigated by means of <sup>2</sup>H nuclear magnetic resonance (NMR) experiments over a wide temperature range. The temperature dependencies of the quadrupole line splittings in the one-dimensional spectra of AHSe above 350 K revealed line-shape changes which are characteristic for chemical exchange processes. A detailed study of these exchange processes in AHSe is achieved by means of two-dimensional <sup>2</sup>H NMR experiments. In the temperature range investigated, a chemical exchange occurs only between those deuteron (proton) sites which are involved in hydrogen bonds (- and -positions). It was established that the rates of exchange between all types of hydrogen-bound deuteron are approximately the same. Exchange between these positions and the deuterons in the ND<sub>4</sub> groups could not be detected. On the basis of our findings, we finally discuss a model for the microscopic mechanism of hydrogen transport in AHSe. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Chemical exchange in NH<sub>4</sub>HSeO<sub>4</sub> single crystals studied by two-dimensional <sup>2</sup>H nuclear magnetic resonance |
| Тип | paper |
| DOI | 10.1088/0953-8984/11/18/310 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 11 |
| Первая страница | 3751 |
| Последняя страница | 3760 |
| Выпуск | 18 |
