THE A(1)DELTA-]X(3)SIGMA(-) TRANSITIONS OF ASH AND ASD

Emission spectra of the a(1)a Delta-->X(3) Sigma(-) transitions of AsH and AsD have been observed in the near-infrared spectral region near 1.39 mu m. The arsenic hydride radicals were generated and excited in a fast-flow system by reaction of arsenic vapor with hydrogen or deute rium atoms. The NIR chemiluminescence was measured with a Fourier-tran sform spectrometer equipped with a sensitive germanium detector. Analy ses of the bands have yielded the following spectroscopic constants fo r the a(1) Delta state of AsH (in cm(-1)), where the numbers in parent heses are the standard deviations of the parameters: T-e=7216.84(12), omega(e)=2179.77(20), omega(e)x(e)=37.69(7), B-e=7.3297(9), and D-e=0. 00033. (C) 1996 Academic Press, Inc.