Background current subtractor for the detection of transient signals in kinetic spectrophotometry
- 1 March 1976
- journal article
- letter
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 47 (3) , 379-382
- https://doi.org/10.1063/1.1134629
Abstract
In real‐time kinetic spectrophotometry the background current signal due to the analyzing light beam must be backed off to enable the sensitive detection of the superimposed transient signal. Methods employing filters or amplifiers in the signal path have restrictions in their frequency response so that not all signals of practical duration from a few nanoseconds to a millisecond can be measured with one system. This note describes a current subtraction technique which isolates the subtraction circuit from a direct, low‐impedance path between the photomultiplier and a wide‐band oscilloscope, thereby imposing no significant frequence limitation on the measurement of transient signals.Keywords
This publication has 4 references indexed in Scilit:
- Dual Beam Flash Photolysis System for Studying TransientsReview of Scientific Instruments, 1973
- Wide Band Reversing Transformer as Automatic Backing-off Device in Nanosecond Absorption SpectrophotometryReview of Scientific Instruments, 1973
- Design of a flash photolysis apparatusJournal of Physics E: Scientific Instruments, 1971
- Design and Performance of a Pulse Radiolysis System Capable of Picosecond Time ResolutionReview of Scientific Instruments, 1970