Mass-selected beams of atomic ${\mathrm{Ce}}^{q+}$ ions ($q=2$, 3, 4), ${\mathrm{C}}_{82}^{+}$ and endohedral $\mathrm{Ce}@{\mathrm{C}}_{82}^{+}$ were employed to study photoionization free encaged cerium atoms. The Ce $4d$ inner-shell contributions single double ionization the fullerene have been extracted from data compared with expectations based on theory experiments ions. Dramatic reduction redistribution photoabsorption is observed. More than half oscillator strength appears be...

The first experimental results on photoionization of mass-selected endohedral Sc3N@C80+ and Ce@C82+ fullerene ions are reported. merged-beams technique was employed to measure photo-ion yield spectra as well absolute cross sections. Comparing the fullerenes with those obtained using "empty" C80+ C82+ provides insight into mutual influence cage encapsulated atom or molecule one another in photoabsorption processes.

We report on experimental and theoretical results for the photoionization of Ag-like xenon ions, Xe$^{7+}$, in photon energy range 95 to 145~eV. The measurements were carried out at Advanced Light Source an resolution $\Delta$E = 65 meV with additional made 28 39 meV. Small resonance features below ground-state ionization threshold, about 106 eV, are due presence metastable Xe$^{7+} (4d^{10} 4f~^2{\rm F}^{\circ}_{5/2,7/2})$ ions ion beam. On basis accompanying calculations using Dirac Atomic...

Absolute photoionization measurements were performed for a mixture of ${}^{2}{P}_{3/2}^{o}$ ground-state and ${}^{2}{P}_{1/2}^{o}$ metastable-state Ca${}^{3+}$ ions over the photon energy range $65.7$--$104.6$ eV by merging an ion beam with monochromatized synchrotron radiation. The ionization threshold ground state was measured to be $67.063$ $\ifmmode\pm\else\textpm\fi{}$ $0.015$ eV, which is $0.207$ lower than value tabulated in NIST database. Most observed resonances associated multiple...

Photoionization cross sections for ${\text{Ce}}^{q+}$ $(1\ensuremath{\le}q\ensuremath{\le}9)$ ions were measured in the 105--180 eV energy range of $4d$ inner-shell giant resonance by merging a mass-to-charge-ratio-selected ion beam with monochromatized synchrotron radiation. The Cowan atomic structure code was used as an aid to interpret experimental data. Four Rydberg series $4d\ensuremath{\rightarrow}nf$ $(n\ensuremath{\ge}4)$ and $4d\ensuremath{\rightarrow}np$ $(n\ensuremath{\ge}6)$...

Absolute photoionization cross sections for ${\mathrm{Kr}}^{3+}$ were measured in the energy range $39.05--143.2\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ single ionization and $120.6--137.7\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ double ionization. For comparison, an electron-impact single-ionization measurement was made $43.1--179.1\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ normalized to previously published absolute measurements. The Flexible Atomic Code Cowan atomic structure codes used...

Absolute cross-section measurements are reported for single photoionization of $\mathrm{C}{{}_{n}}^{+}$ fullerene molecular ions ($n=40$, 50, 70, 76, 78, and 84) in the photon-energy range 18--70 eV. The experiments were performed by merging a mass charge selected beam with monochromatized synchrotron radiation measuring yield $\mathrm{C}{{}_{n}}^{2+}$ product as function photon energy. Oscillator strengths determined integrating measured cross sections over this energy exhibit linear...

The absolute single-photoionization cross section was measured for Cl-like ${\mathrm{K}}^{2+}$ over the photon energy range from 44.2 to 69.7 eV at a constant resolution of 0.045 eV. experiments were performed by merging an ion beam with synchrotron radiation undulator. ground-state ionization threshold 0.004-eV be $45.717\ifmmode\pm\else\textpm\fi{}0.030$ measurements are rich in resonance structure due multiple Rydberg series transitions autoionizing states. These assigned...

Absolute cross sections for photoionization and electron-impact ionization of ${\mathrm{Ar}}^{5+}$ have been measured using two different interacting-beams setups. The spectra consist measurements the yield products due to single as a function electron or photon energy. In addition, absolute were normalize ${\mathrm{Ar}}^{6+}$ product-ion spectra. energy range from $90\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}111\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$, both are dominated...

The cross section for photoionization of Xe7+ has been measured on an absolute scale with the photon-ion merged beams technique at a synchrotron light source. experimental photon energy range 95 145 eV comprises ground state ionization threshold about 106 and prominent 4d9 5s 5f2P resonance 122.14 o 0.2 eV. strength this is found to account 15% 4d absorption oscillator strength. With spread 50 meV width could be determined 8% uncertainty 72 meV.

Absolute cross sections were measured for photoionization of Ceq+ (1 ≤ q 9) ions at photon energies between 110 eV and 150 with a spectral resolution 0.1 eV. The in this energy range are dominated by 4d – nf np autoionizing transitions. Within the experimental uncertainty, total oscillator strengths shell determined integrating cross-section measurements consistent sum rule value 10 based on number electrons.

Mass‐selected beams of endohedral fullerene Ce@C82+ ions, atomic Ceq+ ions (q = 2, 3, 4), and empty fullerene‐cage C82+ were employed to study photoionization fullerene‐encapsulated free cerium atoms. The Ce 4d inner‐shell contributions single double ionization the have been extracted from data compared with expectations based on theory experiments ions. Dramatic reduction redistribution photoabsorption is observed. More than half oscillator strength apparently diverted additional decay...

Availability of a reliable and consistent source for high temperature ceramic capacitors has been an ongoing issue design engineers looking at developing product applications up to including +300°C. The general practice derate standard X7R settle device characterized by significant reduction in those critical performance features related capacitance value, operating voltage, insulation resistance breakdown not mention substantial roll off coefficient above +150°C. In addition, the need...

Availability of a reliable and consistent source for high temperature ceramic capacitors has been an ongoing issue design engineers the purpose developing product applications up to including +300°C. The general practice de-rate standard X7R settle device characterized by significant reduction in critical performance features related capacitance value, operating voltage, insulation resistance breakdown not mention substantial roll off coefficient above +150°C. In addition, need provide...

Cerium atoms and ions with a filled 4d subshell are expected to have photoabsorption oscillator strength of 10 according the number equivalent electrons in that shell. While this expectation was confirmed for free atomic cerium by observing single double photoionization channels, measurements Ce encapsulated within C82 Fullerene cage showed ionization channels contain far less than 50% strength.