Issue 59, 2018, Issue in Progress

Vibrational properties of isotopically enriched materials: the case of calcite

Abstract

Isotope enrichment is widely used to affect atomic masses, facilitating data acquisition and peak assignments in experiments such as nuclear magnetic resonance and infrared spectroscopy. It is also used for elucidating the origin of weak features in systems where natural isotopic abundances are low. However, it is not possible to always know a priori precisely how vibrational modes change for arbitrary levels of isotopic substitution. Here, we examine this issue by presenting a joint experimental and theoretical study for the important case of 13C isotope substitution effects on the infrared spectra of calcite. By systematically varying the 13C : 12C ratio, we find that the relative positions and intensities of infrared-active vibrational modes can vary, in a non-linear and mode-dependent fashion, with minority isotope content and proximity. This allows us to determine the origin of weak spectral features due to the natural abundance of isotopes and to show that even relatively low levels of substitution are not necessarily within the “dilute limit,” below which isotopic substitutions do not interact.

Graphical abstract: Vibrational properties of isotopically enriched materials: the case of calcite

Supplementary files

Article information

Article type
Paper
Submitted
06 Aug 2018
Accepted
24 Sep 2018
First published
03 Oct 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 33985-33992

Vibrational properties of isotopically enriched materials: the case of calcite

B. Xu, A. Hirsch, L. Kronik and Kristin M. Poduska, RSC Adv., 2018, 8, 33985 DOI: 10.1039/C8RA06608F

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