dc.creator Decius, J. C. en_US dc.creator Fredrickson, L. R. en_US dc.date.accessioned 2006-06-15T13:49:44Z dc.date.available 2006-06-15T13:49:44Z dc.date.issued 1976 en_US dc.identifier 1976-TD-1 en_US dc.identifier.uri http://hdl.handle.net/1811/9837 dc.description Author Institution: Department of Chemistry, Oregon State University en_US dc.description.abstract The one and two phonon Raman bands of $NH_{4} Cl$ and $ND_{4}Cl$ have been observed at about $15^\circ K$, using polarization. Measurements of the splitting and relative intensities of the transverse and longitudinal components of infrared allowed $(F_{2})$ fundamentals and using the known value of the nonlinear susceptibility in principle permits the evaluation of both the infrared $\left (\displaystyle \frac {\partial \mu}{\partial q} \right )$ and Raman $\left ( \displaystyle \frac {\partial \alpha}{\partial q}\right )$ molecular intensity parameters as originally pointed out by Poulet. Then, by further simple relative intensity measurements of the $A_{1}$ and E modes compared with the $F_{2}$ modes, all molecular intensity parameters of the ammonium ion can be determined without any absolute cross section measurements. The resultant dipole derivatives are analyzed in terms of effective atomic charges. Several two phonon bands have been studied, notably $2\nu_{6}$, $\nu_{4} + \nu_{6}$, $2\nu_{4}$ and $\nu_{1} + \nu_{5}$. Those which are expected to contain an $A_{1}$ symmetry component at $k = 0$, i.e, $2\nu_{6}$ and $2\nu_{4}$, exhibit a sharp, partly separated component at the low frequency edge which is $A_{1}$ polarized. In such cases, an-harmonicity has apparently separated the $\Delta \nu = 2$ one phonon transition from the rest of the two-phonon band. The observed frequencies for $2\nu_{6}$ are in excellent agreement with an anharmonic potential function proposed by H\""{u}ller and Kane. en_US dc.format.extent 156298 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title POLARIZED RAMAN SPECTRUM OF AMMONIUM CHLORIDE en_US dc.type article en_US
﻿