Abstract
Several species (e.g., H and O) that are of interest in combustion studies have dipole-allowed transitions only at wavelengths of <200 nm. Because these wavelengths are strongly absorbed by flame gases, multiphoton excitation using near-UV wavelengths (200-400 nm) provides an important means of detecting such species in combustion environments. The high-intensity optical radiation required for multiphoton excitation has the potential for inducing a variety of photochemical effects in the environment being probed, and we have previously reported such effects in 205-nm excitation of atomic hydrogen1 and 226-nm excitation of atomic oxygen.2 We describe different types of photochemical effect observed during 243-nm excitation of atomic hydrogen.
© 1988 Optical Society of America
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