Dipole Aligned Solids - A Metastable Phase of Molecular Materials

Alexander Rosu-Finsen, Jerome Lasne, Andrew Cassidy, David Field, Martin R S McCoustra

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In recent years, observations of the presence of a spontaneous and powerful static electric field within thin films of molecular solids have been reported by Field and co-workers [1]. These electric fields, which can approach 10^8 V m-1 or more, are believed to arise from alignment of the molecular dipoles in the thin films. Seeking to provide an independent means of observing this phenomenon of the "spontelectric phase", the first new electrically unique, structural phase to have emerged in decades, we have used reflection-absorption infrared spectroscopy (RAIRS) to investigate thin films of nitrous oxide (N2O). The presence of a static electric field within the thin film, the defining characteristic of spontelectrics, is demonstrated through the observed temperature dependence of longitudinal-transverse optical (LO-TO) splitting in RAIR spectra, using an analysis based on the vibrational Stark effect [2]. Tentative evidence for the surface-templating of the growth of the spontelectric phase will be presented from RAIRS studies of solid carbon monoxide (CO) on a range of water substrates (porous amorphous solid water, compact amorphous solid water and crystalline water) [3].

[1] Spontaneous electric fields in solid films: spontelectrics. D. Field, O. Plekan, A. Cassidy, R. Balog, N.C. Jones and J. Dunger, Int. Rev. Phys. Chem., 2013, 32, 345-392.

[2] Spontaneously electrical solids in a new light. J. Lasne, A. Rosu-Finsen, A. Cassidy, M. R. S. McCoustra and D. Field, Phys. Chem. Chem. Phys., submitted.

[3] Templating dipole alignment in solid carbon monoxide on water ice surfaces. A. Rosu-Finsen, J. Lasne, A. Cassidy, D. Field and M. R. S. McCoustra, Phys. Chem. Chem. Phys., in preparation.
Original languageEnglish
Title of host publication62nd International Symposium of the American Vacuum Society
Publication statusPublished - 19 Oct 2015
Event62nd International Symposium and Exhibition of American Vacuum Society - San Jose, CA, United States
Duration: 18 Oct 201523 Oct 2015

Conference

Conference62nd International Symposium and Exhibition of American Vacuum Society
Abbreviated titleAVS 2015
CountryUnited States
CitySan Jose, CA
Period18/10/1523/10/15

Fingerprint

dipoles
electric fields
water
thin films
carbon monoxide
absorption spectroscopy
infrared spectroscopy
alignment
nitrous oxides
Stark effect
ice
temperature dependence
preparation

Cite this

Rosu-Finsen, A., Lasne, J., Cassidy, A., Field, D., & McCoustra, M. R. S. (2015). Dipole Aligned Solids - A Metastable Phase of Molecular Materials. In 62nd International Symposium of the American Vacuum Society [TF+AS+SS-MoM2]
Rosu-Finsen, Alexander ; Lasne, Jerome ; Cassidy, Andrew ; Field, David ; McCoustra, Martin R S. / Dipole Aligned Solids - A Metastable Phase of Molecular Materials. 62nd International Symposium of the American Vacuum Society. 2015.
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author = "Alexander Rosu-Finsen and Jerome Lasne and Andrew Cassidy and David Field and McCoustra, {Martin R S}",
note = "Title in conference programme: IR Spectroscopic studies of Molecular Thin Films exhibiting Spontaneous Dipole Alignment",
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Rosu-Finsen, A, Lasne, J, Cassidy, A, Field, D & McCoustra, MRS 2015, Dipole Aligned Solids - A Metastable Phase of Molecular Materials. in 62nd International Symposium of the American Vacuum Society., TF+AS+SS-MoM2, 62nd International Symposium and Exhibition of American Vacuum Society, San Jose, CA, United States, 18/10/15.

Dipole Aligned Solids - A Metastable Phase of Molecular Materials. / Rosu-Finsen, Alexander; Lasne, Jerome; Cassidy, Andrew; Field, David; McCoustra, Martin R S.

62nd International Symposium of the American Vacuum Society. 2015. TF+AS+SS-MoM2.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Dipole Aligned Solids - A Metastable Phase of Molecular Materials

AU - Rosu-Finsen, Alexander

AU - Lasne, Jerome

AU - Cassidy, Andrew

AU - Field, David

AU - McCoustra, Martin R S

N1 - Title in conference programme: IR Spectroscopic studies of Molecular Thin Films exhibiting Spontaneous Dipole Alignment

PY - 2015/10/19

Y1 - 2015/10/19

N2 - In recent years, observations of the presence of a spontaneous and powerful static electric field within thin films of molecular solids have been reported by Field and co-workers [1]. These electric fields, which can approach 10^8 V m-1 or more, are believed to arise from alignment of the molecular dipoles in the thin films. Seeking to provide an independent means of observing this phenomenon of the "spontelectric phase", the first new electrically unique, structural phase to have emerged in decades, we have used reflection-absorption infrared spectroscopy (RAIRS) to investigate thin films of nitrous oxide (N2O). The presence of a static electric field within the thin film, the defining characteristic of spontelectrics, is demonstrated through the observed temperature dependence of longitudinal-transverse optical (LO-TO) splitting in RAIR spectra, using an analysis based on the vibrational Stark effect [2]. Tentative evidence for the surface-templating of the growth of the spontelectric phase will be presented from RAIRS studies of solid carbon monoxide (CO) on a range of water substrates (porous amorphous solid water, compact amorphous solid water and crystalline water) [3]. [1] Spontaneous electric fields in solid films: spontelectrics. D. Field, O. Plekan, A. Cassidy, R. Balog, N.C. Jones and J. Dunger, Int. Rev. Phys. Chem., 2013, 32, 345-392.[2] Spontaneously electrical solids in a new light. J. Lasne, A. Rosu-Finsen, A. Cassidy, M. R. S. McCoustra and D. Field, Phys. Chem. Chem. Phys., submitted.[3] Templating dipole alignment in solid carbon monoxide on water ice surfaces. A. Rosu-Finsen, J. Lasne, A. Cassidy, D. Field and M. R. S. McCoustra, Phys. Chem. Chem. Phys., in preparation.

AB - In recent years, observations of the presence of a spontaneous and powerful static electric field within thin films of molecular solids have been reported by Field and co-workers [1]. These electric fields, which can approach 10^8 V m-1 or more, are believed to arise from alignment of the molecular dipoles in the thin films. Seeking to provide an independent means of observing this phenomenon of the "spontelectric phase", the first new electrically unique, structural phase to have emerged in decades, we have used reflection-absorption infrared spectroscopy (RAIRS) to investigate thin films of nitrous oxide (N2O). The presence of a static electric field within the thin film, the defining characteristic of spontelectrics, is demonstrated through the observed temperature dependence of longitudinal-transverse optical (LO-TO) splitting in RAIR spectra, using an analysis based on the vibrational Stark effect [2]. Tentative evidence for the surface-templating of the growth of the spontelectric phase will be presented from RAIRS studies of solid carbon monoxide (CO) on a range of water substrates (porous amorphous solid water, compact amorphous solid water and crystalline water) [3]. [1] Spontaneous electric fields in solid films: spontelectrics. D. Field, O. Plekan, A. Cassidy, R. Balog, N.C. Jones and J. Dunger, Int. Rev. Phys. Chem., 2013, 32, 345-392.[2] Spontaneously electrical solids in a new light. J. Lasne, A. Rosu-Finsen, A. Cassidy, M. R. S. McCoustra and D. Field, Phys. Chem. Chem. Phys., submitted.[3] Templating dipole alignment in solid carbon monoxide on water ice surfaces. A. Rosu-Finsen, J. Lasne, A. Cassidy, D. Field and M. R. S. McCoustra, Phys. Chem. Chem. Phys., in preparation.

M3 - Conference contribution

BT - 62nd International Symposium of the American Vacuum Society

ER -

Rosu-Finsen A, Lasne J, Cassidy A, Field D, McCoustra MRS. Dipole Aligned Solids - A Metastable Phase of Molecular Materials. In 62nd International Symposium of the American Vacuum Society. 2015. TF+AS+SS-MoM2