Formation and detection of ultracold ground-state polar molecules
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We report on the formation of translationally cold $\mathrm{NaCs}$ molecules starting from a laser-cooled atomic vapor of $\mathrm{Na}$ and $\mathrm{Cs}$ atoms. Colliding atoms are transferred into bound molecular states in a two-step photoactivated process in which the atoms are first photoassociated by trap photons into an excited state molecular complex and then allowed to decay into a bound molecular ground state. Time-of-flight measurements show a translational temperature $T=260\ifmmode\pm\else\textpm\fi{}130\phantom{\rule{0.3em}{0ex}}\ensuremath{\mu}\mathrm{K}$ that reflects the measured temperature of the initial atomic gas.Keywords:
Chemical polarity
Chemical polarity
Polarity (international relations)
Component (thermodynamics)
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The structures of two couples of mirror nuclei 17F and 17O, 17Ne and 17N in the ground state and in the first excited state are investigated using the relativistic mean-field approach. Two-proton halo in 17Ne in the first excited state and in the ground state and two-neutron halo in 17N in the first excited state are suggested. Meanwhile, one-proton halo in 17F in the first excited state and one-neutron halo in 17O in the first excited state are also suggested. The skin structure appears in 17F and 17N in the ground state.
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A multiconfiguration close-coupling calculation of the photoionisation of the ground state and low-lying 1Se excited states of neon has been made using a Ne+ target based on orbitals from the optimised potential model. The final-state energies considered extend from threshold into the region of the lowest autoionisation state resonances whose shapes were calculated and found to compare well with experiment where comparison is possible. The largest of the calculated resonances, originating from an excited state, peaks at over 5*101-15 cm2 which is about three orders of magnitude higher than when excited from the ground state. Oscillator strengths for certain bound-bound transitions, and near-threshold cross sections exhibiting d-channel minima for photoionisation of the excited states are also given. Finally, further development of the complex-amplitude analysis of the photoionisation at the resonances is described.
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Abstract In this paper the potential of the electron‐atom interaction was presented which may be useful both in the case of the ground state of an atom with one optical electron and in the case of the excited state of any atom, and which is given by expressions suitable for operational use. The presented potential is used in calculating the transport cross sections for the elastic electron scattering on the atoms of H , Li and Na respectively, in the ground and excited states.
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Simultaneous ionization and excitation of B and Al atoms in the ground and excited states by photons
The cross sections of simultaneous photoionization and excitation of the outermost inner closed subshell electrons of boron and aluminium atoms are calculated within a relaxed-orbital Hartree-Fock framework in the dipole approximation. The atoms in the ground and excited states ns2n's 2S and ns2n'd 2D are considered. Large differences are found between the cross sections near the threshold of photoionization calculated in the average of configuration, term-dependent and MCHF approximations. A very strong enhancement of the ratio of the cross sections of simultaneous photoionization and excitation to those of the direct photoionization of the atoms in the excited state as compared to the same processes for the atoms in the ground state was obtained. A very low probability of shake-up process for B and Al atoms in the ground state was noted.
Photoionization mode
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Photoionization cross sections of the main line and shake-up satellites of the outermost inner shell electrons for lithium, sodium and potassium atoms in the ground state and the first excited state are calculated. A relaxed Hartree-Fock approach within the dipole approximation is applied. Large deviations of cross sections of some terms calculated with the term dependent one-electron radial orbitals from those of the average of configuration are found. A strong enhancement of relative intensity of the shake-up satellites to the main line of photoionization from the outermost closed shell for the atoms in the excited state as compared to the similar process for the atoms in the ground state is also found.
Line (geometry)
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Excitation functions of deuterons from the $^{12}\mathrm{C}(^{3}\mathrm{He}, d)^{13}\mathrm{N}$ reaction over the bombarding-energy range 12-19 MeV were measured at several angles for the ground-state deuterons and at a laboratory angle of 40\ifmmode^\circ\else\textdegree\fi{} for deuterons leading to the ground state, to the first excited state, and to the unresolved second and third excited states. Detailed angular distributions were measured at 16, 17, and 18 MeV for the ground state through the third excited state and at 19 MeV for the ground state through the seventh excited state. The ground-state angular distributions were analyzed with the conventional distorted-wave Born approximation. For the excited states, all of which are unstable with respect to proton decay, a number of alternative methods of calculation were attempted and the results were compared.
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Cross sections of single and shake-up photoionization from the subvalence s subshell of sodium and potassium atoms are calculated. The relaxed-orbital multiconfiguration and single-configuration Hartree - Fock approaches are applied to the atoms in the ground state and in the first excited state . A strong enhancement of the ratio of cross sections of shake-up photoionization to those of single photoionization of the atoms in the excited state was obtained as compared with the same process for the atoms in the ground state.
Photoionization mode
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