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Resonant two-photon ionization spectroscopy of jet-cooled UN: Determination of the ground state
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10.1063/1.4803472
/content/aip/journal/jcp/138/18/10.1063/1.4803472
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/18/10.1063/1.4803472

Figures

Image of FIG. 1.
FIG. 1.

Vibronically resolved spectrum of UN, showing bands that were rotationally resolved.

Image of FIG. 2.
FIG. 2.

Rotationally resolved scan over the 17 011 cm band of UN (upper trace) and simulated spectrum at 35 K (lower trace).

Image of FIG. 3.
FIG. 3.

Rotationally resolved scan over the 16 421 cm band of UN (upper trace) and simulated spectrum at 20 K (lower trace).

Image of FIG. 4.
FIG. 4.

Rotationally resolved scan over the 16 177 cm band of UN (upper trace) and simulated spectrum at 20 K (lower trace).

Image of FIG. 5.
FIG. 5.

Average energy of the states deriving from the various configurations listed, relative to the average energy of all configurations listed, for Th, Pa, and U. The number of states arising from each configuration is provided in parentheses. The massive configurational reordering with nuclear charge explains why ThF, PaO, and UN have different ground states.

Image of FIG. 6.
FIG. 6.

Normalized radial probability density plots of the 5, 6, and 7 orbitals of U, calculated using numerical Hartree-Fock methods for the [Rn]56 7 configuration. It is obvious that a significant fraction of the 7 electron density lies outside the internuclear distance in UO and UN.

Image of FIG. 7.
FIG. 7.

Average energy of the states deriving from the various configurations listed, relative to the average energy of all configurations listed, for U, UO, and UN, showing the effect of the (ℓ, ℓ) term on the configurational energy. This term leads to a stabilization of the 7 5 configuration in UN, but is not quite sufficient to explain its emergence as the ground state. As in Figure 5 , the number of states arising from each configuration is provided in parentheses.

Tables

Generic image for table
Table I.

Spectroscopic constants for the UN bands that were rotationally resolved.

Generic image for table
Table II.

Spectroscopic constants for the UO bands that were rotationally resolved.

Generic image for table
Table III.

Electronic configurations of U and corresponding terms.

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/content/aip/journal/jcp/138/18/10.1063/1.4803472
2013-05-08
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Resonant two-photon ionization spectroscopy of jet-cooled UN: Determination of the ground state
http://aip.metastore.ingenta.com/content/aip/journal/jcp/138/18/10.1063/1.4803472
10.1063/1.4803472
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