Spectroscopy, Thermochemistry, and Reactivity of Lanthanide and Actinide Molecules

Morse, Michael D. ; Armentrout, Peter B.

关键词: ACTINIDES;    BOND LENGTHS;    CATIONS;    CONSTRUCTION;    GROUND STATES;    IONIZATION;    RARE EARTHS;    SPECTRA;    SPECTROSCOPY;    TRAPPING;    URANIUM spectroscopy;    thermochemistry;    reactivity;    thorium;    uranium;    resonant two-photon ionization spectroscopy;    guided ion beam mass spectrometry;    uranium mononitride;    bond energy;   

DOI  :  10.2172/1048544
RP-ID  :  DOE/SC0004117-1
PID  :  OSTI ID: 1048544
Others  :  TRN: US1204563

美国|英语

来源: SciTech Connect

【 摘 要 】

The research undertaken under this grant is described in this document. The document describes progress in the construction of an instrument for recording photodissociation action spectra of mass-selected cryo-cooled cations. The instrument is not yet functional, but we anticipate trapping ions and conducting photodissociation experiments before the end of the year. It also describes resonant two-photon ionization spectra that have been recorded for uranium mononitride (UN) in the visible portion of the spectrum. These experiments are still underway at the present time. Although the spectra are a bit difficult to properly fit, due to upper state perturbations, it appears that the molecule has a ground state with {Omega} = 3.5 and a bond length of approximately 1.76 {angstrom}. Finally, results on the thermochemistry and reactivity of Th{sup +} are presented. In these studies the bond energies of the following bonds have been determined: D{sub 0}(Th{sup +}-2O) = 10.2 {+-} 0.2 eV; D0(Th{sup +}-N) = 6.69 {+-} 0.35 eV; D0(Th{sup +}-O) = 8.40 {+-} 0.28 eV; D{sub 0}(OTh{sup +}-O) = 1.8 {+-} 0.4 eV.