Page 119 - An Introduction to Analytical Atomic Spectrometry - L. Ebdon
P. 119
Page 102
Obviously, increasing the dynode voltage, and hence the amplification, tends to increase these
unwanted signals. Thus, the high voltage supply (commonly up to 1000 V) must be highly stabilized
and is only increased as necessary.
Charge injection device (CID) and charge-coupled device (CCD) detectors can be used to monitor
large portions of the spectrum in multiple orders by taking an 'electronic photograph'. They are
analogous to photographic plates which were used in the earliest spectrometers. A typical
Figure 4.16
Picture of a CCD detector (top) and schematic diagram of the two-dimensional
detector array with respect to wavelength and order (bottom) (reproduced with
permission from the Perkin Elmer Corporation).
