We report fluorescence excitation and emission spectra of the CHBr molecule generated via pyrolysis of CH3Br in a molecular beam experiment. The 193 nm attenuation cross sections were estimated from the reduction of the CHBr signal as a function of the excimer laser fluence. The derived 193 nm absorption cross section for CHBr [(3.24 ± 0.59 ], but the difference is within the estimated uncertainties in the measured cross section.
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