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 Title: EXAMINING THE LOW ENERGY STATES OF NDO+ USING TWO-PHOTON IONIZATION Author(s): Persinger, Thomas D. Contributor(s): Heaven, Michael ; VanGundy, Robert A. Subject(s): Metal containing Abstract: The auto-ionization reaction Nd + O $\rightarrow$ NdO$^{+}$ + e$^{-}$ has been explored as a possible means for controlled modulation of the electron density in the thermosphere. High-altitude Nd release experiments have been conducted using sounding rockets, but the degree of ionization achieved was uncertain. The ionization energy (IE) of NdO is a key parameter for determination of the electron yield from the auto-ionization reaction, and the value available from the literature was of questionable accuracy. Resonantly enhanced two photon ionization (R2PI) was used to remeasure the IE. The value obtained, 5.5083(2) eV, was 0.54 eV higher than previous estimates. Combined with estimates of the NdO$^{+}$ bond dissociation energy, our result indicates that the auto-ionization reaction is exothermic by 1.76(10) eV. Low energy states of NdO$^{+}$ were examined using pulsed-field ionization zero kinetic energy photoelectron spectroscopy (PFI-ZEKE). A total of thirty vibronic levels arising from eight electronic states of NdO$^{+}$ were observed. The pattern of electronic states indicates that the lowest energy electronic configuration is Nd$^{3+}$(4f3)O$^{2-}$, which agrees with electronic structure calculations and ligand field theory models. Issue Date: 2019-06-19 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/104380 DOI: 10.15278/isms.2019.WJ03 Rights Information: Copyright 2019 Thomas D. Persinger Date Available in IDEALS: 2019-07-152020-01-25
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