Photon correlation in the nanosecond delay time range by arrival times of photoelectric pulses can be achieved using a computer-controlled digital counter. We have demonstrated the dynamic range of such a photon-counting system by determining the linewidths of light scattered from concentration fluctuations in a noncritical binary fluid mixture and in an aqueous suspension of polystyrene latex spheres. The system can be used to measure linewidths from about a few hundred hertz to the tens of megahertz. The RCA C31034 and C31034-A photomultiplier tubes with gallium arsenide photocathodes have been assessed for application in experiments related to photon-correlation spectroscopy. Pulse height distributions, overall quantum-counting efficiencies, time-dependent statistical correlations, and dark count properties have been investigated. Our results show that both tubes are superior to the previously tested photomultiplier tubes in terms of overall quantum-counting efficiencies, after-pulsing characteristics, and dead time. They match with existing fast amplifiers and discriminators which permit photon-correlation measurements in the nanosecond delay time range.
No takes yet. Share an insight, caveat, or question.
Gülari et al. (1977) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: