Abstract
Ion-dip spectroscopy, a variant of stimulated-emission pumping, previously allowed us to characterize the rotational structure of the fast-predissociating species NH3 By using the vibronic levels of the à level as the intermediate state in a straight optical–optical double-resonance multiphoton ionization method, we obtained new spectra of the ND3 ν3, ν4, and ν3 + ν4 vibronic levels. Spectral assignment, including rotational analysis, was made, in which direct, convincing experimental evidence of the Jahn–Teller effect for the ν3 and ν4 modes is presented for ND3. The Jahn–Teller coupling parameters are approximately λ3 ≈ 0.043 and λ4 ≈ 0.060, respectively.
© 1990 Optical Society of America
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