Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
91 (1989), S. 1351-1356
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The growth and decay of radiation pressure induced (concentration) gratings (RPIGs) have been monitored by diffraction of a probe beam. In all cases the growth of diffracted intensity in the presence of radiation pressure followed a curve of the form I=I0 [1−exp(γt/τD )]2 where γ is a constant and τD is the characteristic time for diffusion. When the writing laser pulse was terminated, the decay of diffracted intensity was described by exp(−2t/τD ). The fitting parameter γ is equal to unity at low intensities and becomes linear in radiation intensity at high intensities. A simple equation relating γ to the ratio of the potential energy of a microsphere in the radiation field to its average kinetic energy has been derived. Diffusion coefficients can be determined from τD values even for turbid samples; however, errors were found when short path lengths (0.1 mm) were used. This is thought to result from particle-surface interactions under the influence of the scattering force.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.457158
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