 |
| Titel |
Hydrogen-Deuterium exchange monitored by ATR-FTIR spectroscopy |
| VerfasserIn |
Brent Poe, Alessandro Del Vecchio, Mariangela Cestelli Guidi |
| Konferenz |
EGU General Assembly 2016
|
| Medientyp |
Artikel
|
| Sprache |
en
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250135387
|
| Publikation (Nr.) |
 EGU/EGU2016-16246.pdf |
|
|
|
|
|
| Zusammenfassung |
| Measuring the extent of isotopic exchange is a common means for the determination of
self-diffusion coefficients in any type of medium (gas, liquid, amorphous solid, crystalline
solid). For rapidly diffusing species such as hydrogen in condensed phases, real time
methods involving vibrational spectroscopy can be used by taking advantage of the
large relative mass difference between 1H and 2H, resulting in large differences
in the band positions of their vibrational modes. We demonstrate rapid isotopic
exchange between D2O liquid and H2O vapor using ATR (attenuated total reflectance)
in a FTIR spectrometer. Over the course of a few minutes several spectra were
acquired of a D2O droplet mounted on a diamond crystal. The progressive exchange
reaction between the liquid phase and H2O from the atmosphere was monitored by
measuring the decreasing absorbance of the D-O-D bending and O-D stretching
bands and the increasing absorbance of the D-O-H and H-O-H bending and O-H
stretching bands as functions of time. Our results offer some intriguing insights
into the structural characteristics of water as inferred by this exchange process. |
|
|
|
|
|
|