Resolution of Transient States of Nitrile Anions via Photodissociation Action Spectroscopy Our Progr

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Resolution of Transient States of Nitrile Anions
via Photodissociation Action Spectroscopy Our
Progress to Date
The 2 traces show resonant Cu atomic transitions
acquired using two different techniques top
trace Resonant 2-Photon Ionization spectroscopy
and bottom trace R(11)3PI where (11)
indicates the simultaneous absorption of 2
photons from the same laser. The signals
evident in the lower trace were acquired using
significantly higher laser intensities and
provide more structure. The intense sharp
features are assigned as a 2-photon Rydberg
series (2D5/2 ? 2S1/2) converging to the copper
ionization limit (sharp threshold). The state
which non-resonantly couples the ground state to
the 2D5/2 is a superposition composed primarily
of the copper spin orbit components seen in the
top trace.
The observed state term energies (twice the dye
laser frequency) and those published in the NIST
database, plotted as a function of 1/n2 for the
2D5/2 ? 2S1/2 Rydberg series. The Rydberg
formula predicts linear behavior in the limit as
n?8. Extrapolation to this limit permits the
determination of the quantum defect for electrons
in d-orbital angular momentum states. For
copper, this value is 0.92 0.03