Light scattering cells

Fig. 1.5.2 Schematic diagrams of aerosol-vapor mixing manifolds. A The aerosol passes through the center tube while the reactant vapor (e.g., water vapor) is introduced through the capillaries (6). B (1) Inner tube for the liquid aerosol tlow, (2) outer tube for the humidified gas (e.g. helium), (3) cross section of the chamber, (4) variable reaction distance (X). (5) light beam. (6) illuminated light scattering volume, (7) light scattering cell. (From Ref. 37.)...

Fig. 19 Detector block for the light-scattering detector. (1) nebulizer, (2) drift tube, (3) heated copper block, (4) light-scattering cell, (5) glass rod, (6) glass window, (7) diaphragm. (Reproduced from A. Stoly-hwo, H. Colin, and G. Guiochon, J. Chromatogr. 265 1 (1983) with permission.)...

Light scattering cells were of the type designed by Dandliker and Kraut (II) to permit the solution to be centrifuged in the cells for removal of dust. The cells were floated in sulfuric acid and centrifuged for 4—6 hours at 9000 r.p.m. in a Servall centrifuge equipped with a swinging bucket rotor. Cells suitable for use were selected from a hand-... 

Fig. 9.4. Typical laser ablation cells with lateral inlet and outlet of the carrier gas (A) and tangential flow of the carrier gas (B). (C) Cross-sectional views of laser light-scattering cell.

Specially shaped cells are required for special uses. One case in point is the cell depicted in Fig. 9.4C, which was designed to correct the variation of aerosol density in LA-ICP-MS and was a laboratory-made laser light-scattering cell for insertion into the aerosol transport tube between the laser ablation system and the torch. In this way, the temporal variation of signals from the laser light-scattering cell was correlated with that of the ion signals from the mass spectrometer [28]. 

The unique detection principle of evaporative lightscattering detectors involves nebulization of the column effluent to form an aerosol, followed by solvent vaporization in the drift tube to produce a cloud of solute droplets (or particles), and then detection of the solute droplets (or particles) in the light-scattering cell. 

Evaporative light scattering detection involves three successive and interrelated processes nebulization of the chromatographic eluent, evaporation of the volatile solvent (mobile phase), and scattering of light by residual analyte particles. The three major parts of the system are the nebulizer, drift tube, and light-scattering cell. 

A cross-sectional view of the high-pressure light scattering cell is shown in Figure 1. The cylindrical light scattering cell window was a high-precision sapphire tube with an inside diameter of 1.9 cm and an outside diameter of 3.2 cm. To achieve the... 

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