Results 191 to 200 of about 254,154 (222)

THz spectroscopy of ice

LEOS 2001. 14th Annual Meeting of the IEEE Lasers and Electro-Optics Society (Cat. No.01CH37242), 2002
We have shown that the THz-time-domain spectroscopy technique can be used to measure accurately the refractive indices of crystalline ice in the THz range. Our 0.25-1.0 THz results bridge the gap between the microwave and the far IR regions. They agree very well with the curve extrapolated from the microwave data of T. Matsuoka et al.
Kwang-Su Lee, X.-C. Zhang, Y.R. Shen, Xing Wei, Chun Zhang   +4 more
openaire   +2 more sources

VUV spectroscopy of formamide ices

Chemical Physics Letters, 2012
Vacuum UltraViolet (VUV) spectra of formamide ice have been studied using synchrotron radiation. VUV spectra of formamide ice recorded at 30 K revealed two photoabsorption bands, historically labelled V1 and Q in gas phase VUV spectra. However, in contrast to such gas phase spectra the Q band was found to be more intense than the V1 band in the ice ...
B. N. Raja Sekhar, Nykola C. Jones, Søren Vrønning Hoffmann, Nigel J. Mason, Bhalamurugan Sivaraman, Bhalamurugan Sivaraman   +5 more
openaire   +3 more sources

VUV Spectroscopy of Extraterrestrial Ices

AIP Conference Proceedings, 2006
Astrochemistry is the study of chemical processes under those conditions prevalent in astronomical environments. Due to the temperatures found in many astrophysical environments much of this chemistry is heterogeneous chemistry occurring within icy mantles found on planetary surfaces, within comets and on dust grains in the interstellar medium.
Mason, N.J., Dawes, A., Holtom, P.D., Mukerji, R.J., Davis, M.P., Sivaraman, B., Kaiser, R.I., Hoffmann, Søren Vrønning, Shaw, D.A.   +8 more
openaire   +3 more sources

Vibrational spectroscopy of ice interfaces

Applied Physics B, 2002
Vibrational spectroscopy via infrared-visible sum-frequency generation was used to probe interfaces of hexagonal ice(0001) with vapor, a hydrophobic solid, and a hydrophilic solid. The OH stretch vibrational modes for hydrogen-bonded and free dangling OH bonds were measured at various temperatures below bulk melting.
Y. R. Shen, X. Wei
openaire   +2 more sources

Vibrational spectroscopy of ion-irradiated ices

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2001
In the last 20 years we have studied some effects induced by fast ions (E approximately keV-MeV) impinging on solid materials (mainly ices) with a view to their astrophysical relevance. The main techniques used have been infrared and Raman spectroscopy.
G. Strazzulla, Maria Elisabetta Palumbo, G. A. Baratta   +2 more
openaire   +3 more sources

Elastic constants of ice III by Brillouin spectroscopy

The Journal of Chemical Physics, 1994
Brillouin spectroscopy has been used to determine the adiabatic elastic constants of ice III at −20 °C and 2.2 kbar. A new technique was used to grow large single crystals. The bulk adiabatic moduli were found to be C11=153.7, C12=99.5, C13=65.1, C33=115.5, C44=44.6, C66=56.8 kbar.
Tulk, C. A., Gagnon, R. E., Kiefte, H., Clouter, M. J.   +3 more
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Amorphous and crystalline ices studied by dielectric spectroscopy

The Journal of Chemical Physics, 2019
This work reports on frequency dependent ambient-pressure dielectric measurements of hyperquenched glassy water, ice IV, ice VI, as well as a CO2-filled clathrate hydrate, the latter featuring a chiral water network. The dipolar time scales and the spectral shapes of the loss spectra of these specimens are mapped out and compared with literature data ...
L. J. Plaga, A. Raidt, V. Fuentes Landete, K. Amann-Winkel, B. Massani, T. M. Gasser, C. Gainaru, T. Loerting, R. Böhmer   +8 more
openaire   +3 more sources

VUV photoabsorption spectroscopy of sulfur dioxide ice

Phys. Chem. Chem. Phys., 2006
In this paper we present the first study of the VUV photoabsorption spectrum of condensed phase SO(2) recorded over the VUV region 120 to 320 nm (10.33 to 3.64 eV). Distinct spectral features were observed that can be used to distinguish between the formation of amorphous and crystalline ice structures.
Holtom, P.D., Dawes, A., Mukerji, R.J., Davis, M.P., Webb, S.B., Hoffmann, Søren Vrønning, Mason, N.J.   +6 more
openaire   +4 more sources

Investigating ultraviolet photoelectron spectroscopy of ice

Solid State Communications, 1979
Abstract Photoelectron energy distribution curves (EDCs) from ice excited by HeI (21.2 eV) and NeI (16.8 eV) radiation are presented. The strict connection between valence density of states and EDCs forces to rule out the previous suggestion by Shibaguchi et al. that conduction band density of states is of paramount importance in determining the EDCs
Lucio Braicovich, I. Abbati, B. De Michelis   +2 more
openaire   +2 more sources

The premelting of ice studied with photoelectron spectroscopy

Journal of Physics: Condensed Matter, 2002
We address the century-old puzzle of the existence of a liquid-like layer at the ice surface near its melting point with new photoelectron spectroscopic tools using synchrotron radiation. Near-edge x-ray absorption shows that a liquid-like film exists at temperatures as low as -20 °C. Near 0 °C this film is about 20 A thick, i.e., six bilayers.
Hendrik Bluhm, Zahid Hussain, Miquel Salmeron, D. Frank Ogletree, Charles S. Fadley, Charles S. Fadley   +5 more
openaire   +2 more sources