| Popis: |
A germanium photodiode, type L-4521 (Philco-Ford), and a silicon photodiode, type HP-4220 (Hewlett-Packard), have been examined with respect to their behaviour to light absorption signals as obtained in pulse radiolysis, and compared with a photomultiplier. The factors considered were the accuracy of measurement of the amplitude and decay characteristics of a signal over a range of wavelengths, and the response times. Both diodes are found to have rapid rise times (several nanoseconds) for practical purposes. Wavelength and time ranges are given over which reasonably accurate reproduction of absorption signals can be expected. A cursory examination of the indium arsenide diode A-100 (Barnes Engineering Co.) is also given. |
