First and second order Raman scattering of monocrystalline CuCl

Abstract

A detailed study of the first and second order Raman effect in CuCl is presented using either He-Ne or Ar-ion laser beam. The spectrum is observed a t room and liquid N, temperature. For the first time, at room temperature a pronounced polarization effect on the 65 cm-l line was observed when looked either at the r16 component of the spectrum or at the I?, and I ?, ones. I n the lower part of the Raman shift, the rI5 spectrum is the strongest, whereas the r,, I?,, contributions become more visible beyond 200 cm-' but weaker by an order of magnitude. Using recent neutron scattering data (slightly corrected for optical phonons) the major peaks are explained by superimposed lines rather than by isolated processes. The most parts of the features are well interpreted. The lines at 162 and 199 om-l are shown to have a similar temperature shift while the 123 om-l one behaves quite different . ce qui n'est pas le cas pour la raie 8. 123 cm-l.

State of the Surface of Antibacterial Copper in Phosphate Buffered Saline

“…[54][55][56] However, solid CuCl has no characteristic Raman feature in this region; rather, all strong Raman modes from CuCl are observed at lower wavenumbers. [57][58][59] Furthermore, the electrochemical data shows a continuing high dissolution rate, without even slight drops in current density. The species to which this mode belongs can therefore not inhibit the dissolution of copper.…”

First and Second Order Raman Scattering in CuBr and CuI

“…By temperature arguments, the 74 cm spectrum. It comes very probably from an overtone process: mainly 1 …”

Far-infrared reflectivity spectroscopy of cuprous chloride, cuprous bromide and their mixed crystals

“…Cu halides exhibit an ionic conductive phase at high temperature, but at a low enough temperature they crystallize in the zinc-blende structure which is a non-conductive phase (γ phase). In this phase, a variety of anomalies are known to exist and they are especially pronounced in the phonon spectrum of both pure and mixed cuprous halides, whose lattice dynamical properties have been extensively studied for many years by infrared (IR) spectroscopy [1][2][3][4][5][6], Raman spectroscopy [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] and neutron scattering [25][26][27][28][29][30], from room temperature down to liquid helium temperature.…”

“…The main phonon anomaly in CuCl, i.e. the β and γ phonon mode activity observed in the IR [2,3,6] and Raman spectra [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24], was successfully explained by using the off-centre model proposed by Vardeny and Brafman [20,24]. This model is a modification of a disorder model [31] used to explain the unusually high values observed for the cation mean-square displacement, down to quite low temperatures: about 5 K in CuCl [32] and 150 K in CuBr [33].…”