Phototube wavelength range

We see then that the relative fluorescence quantum yield can be determined by measuring the areas under the fluorescence bands of the sample and the fluorescent standard. However, these spectra must be corrected before their true areas can be determined. Several factors are responsible for this. The most important of these are the phototube and monochromator responses. For most phototubes the maximum response occurs within a limited wavelength range, falling off rather sharply in some cases at the short-and long-wavelength ends. This is illustrated in Figure 2.14. Similarly,... 

Multiplier phototube Spectral response Wavelength range, A... 

Phototube detectors are normally sensitive either to radiation of wavelength 200 nm to 600-650 nm, or of wavelength 600-1000 nm. To scan a complete spectral range an instrument must therefore contain two photocells a red sensitive cell (600-800 nm) and a blue cell (200-600 nm). 

Glass bulbs are suitable only for the visible part of the spectrum but can be extended to the uv by fitting quartz windows. However, the sensitivity drops with decreasing wavelength. A much better technique is to coat the face of the phototube with a layer of fluorescent material which extends the useful range to 850A. Sodium... 

Phototube technology provides a wide linear dynamic range, rapid (instantaneous) response, and photon counting capability. Wavelength resolution is determined by the characteristics of the grating and the slit widths used. Hence, it is easy to achieve a wavelength resolution below... 

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