Single-particle optical sensing

Nicoli, D.F. Wu, J.S. Chang, Y.J. McKenzie, D.C. Hasapidis, K. Automatic high resolution particle size analysis by single particle optical sensing. Am. Lab. 1992, July 24 (8), 39. 

In addition,there are several experimental options available for particle size measurement alone. They include single particle optical sensing (SPOS), laser diffraction (LD), and ultrasound attenuation (UA). 

Remsen, E.E., Anjur, S.P., Boldridge, D., Kamiti, M., Li, S., 2005. Correlation of defects on dielectric surfaces with large particle counts in chemical-mechanical planarization (CMP) slurries using a new single particle optical sensing (SPOS) technique. MRS Pioc. Cambridge Univ Press. 

For the optical particle counter of Fig. 6.5, the sensing volume is 1.5 x 1.5 x mm. Determine the total energy scattered by the air molecules in the volume. Compare this with the scattering by single particles with diameters ranging from 0.05 to 5 / m and a refractive index of 1.5. Assume k = 0.5 m and express your answers in terms of the incident intensity. The temperature is 20 0,... 

In this model, which is also known as the optical model following Fernbach et alA, (who used it to describe high energy reactions) the complex potential iV is supposed to represent compound system formation, in the sense of the N. Bohr or uniform, model. It represents any processes which are not described by the single particle interaction with the potential. This model reproduces many of the experimental features of medium energy reactions. An important advance towards an interpretation of the potentials of the optical model in terms of two-nucleon interaction has recently been made by Brueckner . 

These Au nanoparticles, protected by a monolayer of thiolated ligands, display interesting properties, such as single-electron charging and molecule-like HOMO-LUMO energy gaps, and can be used in optical and chemical sensing [70, 71]. Their physicochemical properties are closely related to their size and size distribution. Therefore, the ability to synthesize nano particles in a size-controlled... 

Ideal semiconductor quantum dot structures should exhibit a delta-function-like (atomic-like) density-of-states for both electrons mid holes [4], Optical excitations in such structures are excitonic in nature, since an electron mid a hole confined in a quantum dot necessarily interact via their Coulomb interaction mid, therefore, form mi exciton. Consequently, a single electron-hole pair in a quantum dot corresponds to mi exciton, whereas doubly occupied electron and hole states (both spin states) correspond to a biexciton. Since the Coulomb interaction of the particles is inevitable, it makes no sense to distinguish between excitons mid free electrons mid holes within a quantum dot. Optical gain... 

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