Table of Contents
Laser Chemistry
Volume 5, Issue 3, Pages 133-142

Capillar Gas Chromatography With Laser Optothermal Detection

1Institute of Spectroscopy, Academy of Science of the USSR, Moscow Region, Troitzk 142092, Russia
2Moscow High Technical School, Moscow 107005, Russia

Received 2 February 1984; Accepted 4 May 1984

Copyright © 1985 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The design of a through-flow laser opto-thermal (OT) detector intended for operation as a selective chromatographic detector in combination with capillary columns is described. The main advantage of such a detector is its relative simplicity and high spatial resolution. A new differential scheme of OT detector which can reduce the background signals of scattered radiation by about 102 times is suggested. The threshold sensitivity of OT detector is experimentally estimated to be equal to about 7 ng (ethanol). The higher selectivity of the developed system “gas capillary chromatograph + laser OT spectrometer” has been demonstrated by analyzing a mixture of five atomatic hydrocarbons with the use of a tunable CO2 laser. Recommendations for further modification of the equipment are given.