Abstract
The mass analyzed threshold ionization (MATI) spectrum of CD 3, recorded using two-colour (2+1 ′) multiphoton excitation via the Q-branch transition to the 3p z Rydberg state, is reported. The fast CD 3 radicals are produced by photodissociation of CD 3I at 280 nm. The spectroscopy provides a possible route to state-selection of rovibronic levels of the CD 3 + ion, or for Rydberg tagging of the CD 3 fragments in a photodissociation experiment. The MATI spectrum is simulated using a simple Hund's case (b) to Hund's case (d) intensity model. The variable parameters optimized in the model are the ratio of radial transition moments to the s and d channels (1:1), the MATI bandwidth (∼15 cm −1) and asymmetric lineshape (determined by the discrimination field and the high- n Rydberg decay), and the ionization potential of CD 3 (79287±5 cm −1) .
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