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Optical–optical double-resonance multiphoton-ionization spectroscopy of ammonia-d3. I An investigation of the Jahn–Teller effect for the B ˜ 1 E vibronic levels

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Abstract

Ion-dip spectroscopy, a variant of stimulated-emission pumping, previously allowed us to characterize the rotational structure of the fast-predissociating species NH3 A˜1A2 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 B˜1Eν3, 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 B˜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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