Scattering cross section self-diffusion

Being formed in the gaseous phase medium, the electronically excited particles (EEPs) reach the solid surface by diffusion. The diffusion coefficients of EEPs are, as a rule, smaller than the self-diffusion coefficients of parent gas, a factor that is associated with increasing of the EEP elastic scattering cross-section at parent molecules due to the redis-... 

Samples of natural zeolite, clinoptilolite, both with and without pore-incorporated Cu clusters were investigated by Raman spectroscopy and Diffuse Reflectance Spectroscopy (DRS). The reduction of Cu cluster incorporated in zeolite pores was carried out by heating of samples in dry H2 flow at temperatures from 150 to 450°C for 4 hrs. The comparison of Raman and DRS spectra of all samples evidences the essential role of incorporated in pores and reduced Cu clusters for registration of zeolites Raman spectra under low-intensive (mW/cm ) visible excitation. Possible chemical enhancement mechanisms of Raman scattering cross section for SiO atomic groups in close proximity to self-assembling Cu clusters are discussed. 

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