Laser-Excited Raman Scattering in Polystyrene

Abstract

Atactic polystyrene was examined by argon ion laser-excited Raman scattering. Depolarization measurements of oriented and unoriented polystyrene were made. An analysis is made of the depolarization measurements in terms of the orientation of the sample. Comparisons are made with dichroic measurements made by infrared. Utilizing Raman and infrared polarization data on oriented polystyrene, some changes in band assignments have been made.

Raman circular polarization difference spectra (I+ − I−) excited by circularly polarized laser radiation in atactic polystyrene

“…Raman spectra of atactic polystyrene obtained before the advent of the laser were compiled by Liang and Krimm (43). More recent data have been presented by Cornell and Koenig (6). The spectrum shown in the lower part of Figure 1 almost agrees with that of Cornell and Koenig (6).…”

“…More recent data have been presented by Cornell and Koenig (6). The spectrum shown in the lower part of Figure 1 almost agrees with that of Cornell and Koenig (6). At least four differences are apparent, however:…”

Fourier-transform coherent anti-Stokes Raman scattering microscopy

“…2(c)]. 21,22 The peak near 800 cm −1 in the polystyrene spectrum may have contributions from both the 2-propanol and the polystyrene as a result of limited axial resolution ͑ϳ30 m͒. The CARS signal exhibits attenuation at the solvent-bead interface, in agreement with other reports.…”

Injection- Seeded Optoplasmonic Amplifier in the Visible

“…The dominant Raman mode in the polystyrene spectrum at 1002 cm −1 (Fig. 3b) was first reported by Cornell and Koenig66 in 1968. One concludes that the prominence of the polystyrene Raman lines in the amplifier output spectrum is the result of two factors, the first of which is that the generation of Raman radiation at 1002 cm −1 and 1602.7 cm −1 occurs throughout the sphere and the scattered radiation is largely confined to the sphere by internal reflection, owing to the polystyrene refractive index of 1.58.…”