HIGH TEMPERATURE ABSORPTION COEFFICIENTS OF 02, NH3, AND H20 FOR BROADBAND ArF EXCIMER LASER RADIATION

-Experimentally-determined absorption coefficients for broadband ArF exclmer ra&atlon at 193 mm are presented at temperatures up to 3500 K for 02, NH3, and H20. These values were determined in a high-purity shock tube, either by measuring excimer pulse fractional absorptions or by measuring photolysls-product yields. Correlations between absorption coefficients and wbratlonal populations of the absorbing species are discussed. Using these absorptxon coefficients, a prediction can be made of the amount of O, NH2, OH, and H produced in shock-tube exc~mer-photolysls experiments This &rect production of radicals is attractive for reactxon-kmetics studies m high-temperature gases.