Jump to main content
Jump to site search

Issue 3, 2019
Previous Article Next Article

The optical absorption spectra of spontaneously electrical solids: the case of nitrous oxide

Author affiliations

Abstract

Absorption spectra of films of N2O, in the range 115–160 nm, are presented for deposition temperatures between 33 K and 64 K. Observed shifts in the absorption energy vs. deposition temperature are analysed in terms of the temperature-dependent spontaneously electrical (‘spontelectric’) fields present in the films. Using a simple electrostatic theory, we suggest that (i) spectra are associated with Wannier–Mott excitons, (ii) the action of the electric field upon the excitons suffers a blockade at ≤54 K for the C-state and ≤52 K for the D-state of N2O, (iii) the blockade may be attributed to structural defects, which trap excitons, limiting their size and (iv) films form with defect-free regions containing 324 ± 3, 168 ± 46 and 95 ± 1 molecules of N2O at 54 K, 52 K and 50 K respectively, yielding an experimental indication of the scale size of regular periodicity associated with Wannier–Mott excitons. Results demonstrate how the spontelectric effect can be used as a tool for exploring the structure of solids and give a graphic image of the structural changes that take place close to the known phase change at 47 K/48 K.

Graphical abstract: The optical absorption spectra of spontaneously electrical solids: the case of nitrous oxide

Back to tab navigation

Publication details

The article was received on 11 Sep 2018, accepted on 10 Dec 2018 and first published on 19 Dec 2018


Article type: Paper
DOI: 10.1039/C8CP05746J
Citation: Phys. Chem. Chem. Phys., 2019,21, 1190-1197
  •   Request permissions

    The optical absorption spectra of spontaneously electrical solids: the case of nitrous oxide

    A. Cassidy, R. L. James, A. Dawes, J. Lasne and D. Field, Phys. Chem. Chem. Phys., 2019, 21, 1190
    DOI: 10.1039/C8CP05746J

Search articles by author

Spotlight

Advertisements