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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1992),
  • paper CWP7

Use of intracavity laser spectroscopy based on a dye laser and a CO2-laser for detecting free radicals and stable molecules

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Abstract

Intracavity laser spectroscopy (ILS) is well known as a highly-sensitive and high-speed laser spectroscopy method, based on the high sensitivity of the output laser spectrum from selective losses inside a cavity. Some free radicals such as HCO, NH2, and I2 molecules have absorption spectra in the visible range, so it is possible to use a dye laser in ILS to detect these particles. A band-tuned flashlamp dye laser with the range of radiation 5750–6000 Å was used. In our work free radicals HCO and NH2 were being detected in absorption in the range of absolute concentrations ~(0.001–1.0) × 1015 cm−3 and iodide molecules in the range ~(0.2–1.0) × 1014 cm−3. From the time-dependence of the relative concentrations of HCO, NH2 radicals and an absolute concentration of I2 molecules, rate constants (K2, K2, K3, K4, K5, K6) have been measured for the following elementary processes:

© 1992 Optical Society of America

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