Absolute measurements of cross sections for photoionization a statistical admixture ${\mathrm{Ne}}^{+}$ in the ${}^{2}{P}_{3/2}^{o}$ ground state and ${}^{2}{P}_{1/2}^{o}$ metastable are reported energy range 40--71 eV at photon resolutions ranging from 22 meV to 2 meV. The experiments were performed using synchrotron radiation an undulator beamline Advanced Light Source with newly developed ion-photon-beam endstation. data characterized by multiple Rydberg series autoionizing resonances...

Absolute cross-section measurements for valence-shell photoionization of Ar$^{+}$ ions are reported photon energies ranging from 27.4 eV to 60.0 eV. The data, taken by merging beams and synchrotron radiation at a energy resolution 10 meV, indicate that the primary ion beam was statistically weighted mixture $^2P^o_{3/2}$ ground state $^2P^o_{1/2}$ metastable Ar$^{+}$. Photoionization this C$\ell$-like is characterized multiple Rydberg series autoionizing resonances superimposed on direct...

High-resolution absolute experimental measurements and two independent theoretical calculations were performed for photoionization of O+ ions from the 2P(o) 2D(o) metastable levels 4S(o) ground state in photon energy range 30-35.5 eV. This is believed to be first comparison experiment theory reported states ions. While there correspondence between predicted measured positions relative strengths resonances, cross-section magnitudes fine structure are sensitive choice basis states.

Lifetimes for K-shell vacancy states in atomic carbon have been determined by measurement of the natural linewidth 1s → 2p photoexcited C + ions. The produced photoionization are identical to those photoexcitation a ion: 1s2s 2 22 D, P, and S autoionizing occur both cases. These stabilize emission an electron produce 2+ Measurements reported lifetime P :6 .3± 0.9 fs, 11.2 ± 1.1 fs 5.9 1.3 respectively. Knowledge such lifetimes is important comparative studies Kshell vacancies...

Absolute cross sections for the K-shell photoionization of ground-state Li-like carbon [C3+(1s22s 2S)] ions were measured by employing ion–photon merged-beams technique at Advanced Light Source. The energy ranges 299.8–300.15 eV, 303.29–303.58 eV and 335.61–337.57 [1s(2s2p)3P]2P, [1s(2s2p)1P]2P [(1s2s)3S 3p]2P resonances, respectively, investigated using resolving powers up to 6000. autoionization linewidth resonance was be 27 ± 5 meV compares favourably with a theoretical result 26 obtained...

We have investigated photoionization (PI) of the 1S ground state and 3Po metastable states C2+ ions in photon energy range 40.8-56.9 eV at a resolution 30 meV. Absolute PI cross sections been measured using photon-ion merged beam arrangement Advanced Light Source. Detailed calculations semi-relativistic Breit-Pauli R-matrix approach suggest fraction 40% primary experiment. The present results are discussed light previous electron-C3+-ion photorecombination (PR) studies. As an example, role...

Photoionization of Kr$^+$ ions was studied in the energy range from 23.3 eV to 39.0 at a photon resolution 7.5 meV. Absolute measurements were performed by merging beams and monochromatized synchrotron undulator radiation. (PI) this Br-like ion is characterized multiple Rydberg series autoionizing resonances superimposed on direct photoionization continuum. Resonance features observed experimental spectra are spectroscopically assigned their energies quantum defects tabulated. The...

The principle of microscopic time reversal physical processes, detailed balance, is widely used and depended upon in the theoretical community as a connection between photorecombination (PR) photoionization (PI). This paper reports on novel use balance comparison experimental results obtained by two very distinct techniques to determine both metastable fraction an ion beam partial Sc3+ PR cross sections Sc2+ PI for ground state states. system presents unique opportunity obtain comprehensive...

We have measured the total cross section for photodetachment of Na- ion over photon energy range 30-51 eV. Electron detachment leads predominantly to production Na+ ions in this range. The structures are associated with correlated processes involving or excitation a 2p core electron, which often accompanied by one more valence electrons. most prominent feature is strong resonance electron from and 3s electron. As previous experiments on double electrons, correlation seen play an important...

Cross sections for the photoionization (PI) of ${\mathrm{Sc}}^{2+}$ ions with $[\mathrm{Ar}]3d$ ground-state configuration have been measured by employing merged ion-photon beams method. The were produced from metallic vapor in an electron cyclotron resonance ion source, and photon beam was generated undulator electron-synchrotron storage ring advanced light source Lawrence Berkeley National Laboratory. experimental energy range 23--68 eV encompasses direct $3d$ $3p$ thresholds. photoion...

Absolute photoionization cross sections have been measured for a mixture of ground-state and metastable O II (O+) ions at photon energies ranging from 29.9 to 46.0 eV (414.7 269.5 Å). All measurements were performed by merging an O+ beam with synchrotron radiation undulator line the Advanced Light Source (ALS). At resolution 17 meV, more than 70 spectral features resolved, most them identified characterized. These are compared two independent R-matrix calculations data in TOPbase. three...

Photoionization and electron-impact ionization of ${\mathrm{Xe}}^{3+}$ ions in the region $4d$ inner-shell excitation-autoionization have been studied using interacting-beam spectroscopic techniques. Absolute cross sections for photoionization obtained spectrum has normalized to previously published absolute data. The spectra show large contributions from $4d\ensuremath{\rightarrow}nf$ processes compared lower charge states Xe due significant collapse $nf$ wave functions into ion core as...

Photoionization of Cl III ions into IV was studied theoretically using the ab initio relativistic Breit–Pauli R-matrix (BPRM) method and experimentally at Advanced Light Source (ALS) synchrotron Lawrence Berkeley National Laboratory. A relative-ion-yield spectrum measured with a photon energy resolution 10 meV. The theoretical study carried out large wave-function expansion 45 levels configurations 3s23p2, 3s3p3, 3s23p3d, 3s23p4s, 3s3p23d, 3p4. resulting spectra are complex. We have compared...

Photoionization of triply charged titanium ions was investigated using the merged photon–ion beam technique at a synchrotron light source. The experimental photon energy range 42.6–49.4 eV encompasses threshold for photoionization Ti3+(3p6 3d2 D3/2) ground-state 43.267 eV. Prominent resonance features due to 3p → 3d and 4s excitations are observed with strongest one being 'giant' 3p5(3d23F)2F dipole which has width 1.5 Since it is located only 0.2 above ionization cut-off this in...

We report recent enhancements to the online atomic database at Ohio State University, NORAD-Atomic-Data, that provide various parameters for radiative and collisional processes dominant in astrophysical plasma. NORAD stands Nahar Osu RADiative. The belongs data sources, especially latest works, of international collaborations Opacity Project Iron Project. contents are calculated values energies, oscillator strengths, decay rates, lifetimes, cross-sections photoionization, electron-ion...

The measurement of the mobility $\mathrm{SF}_{6}{}^{\ensuremath{-}}$ in mixtures ${\mathrm{SF}}_{6}$-Ar and ${\mathrm{SF}}_{6}$-Xe is reported over density-reduced electric field strength $E∕N$ 1--180 Td (1 Townsend=${10}^{\ensuremath{-}17}\phantom{\rule{0.3em}{0ex}}\mathrm{V}\phantom{\rule{0.3em}{0ex}}{\mathrm{cm}}^{2}$), from a time-resolved pulsed Townsend technique. Simultaneously, same binary has been calculated set collision cross sections for $\mathrm{SF}_{6}{}^{\ensuremath{-}}$-Ar,...

We present measurements of the total projectile-electron-loss cross sections in ${\mathrm{O}}^{\ensuremath{-}} + {\mathrm{N}}_{2}$ collisions energy range from 2.5 to 8.5 keV. Two different techniques, beam attenuation and growth rate, are employed. The measured using growth-rate method show a threshold behavior. analyze cross-section velocity dependence framework collision between quasifree electron, loosely bound projectile, molecular target. Within free-collision model, we deduce test...

Cross sections for single photoionization of Fe${}^{3+}$, Fe${}^{5+}$, and Fe${}^{7+}$ ions were measured at spectral resolutions 0.04, 0.15, 0.13 eV, respectively, by merging mass- charge-selected ion beams with a beam monochromatized synchrotron undulator radiation. The measurements span photon energy ranges beginning the ionization thresholds extending several tens electron volts to include most important resonant contributions due $3p$--$\mathit{nd}$ transitions autoionizing states....

Unequivocal evidence for significant target outer-shell excitation accompanying multiple-electron capture, in slow collisions of highly charged ions with many-electron atoms, has been obtained by means simultaneous Auger-electron and cold-target recoil-ion momentum spectroscopic measurements. For the 28 keV ${}^{15}{\mathrm{N}}^{7+}+\mathrm{Ar}$ collision system, it is found that accompanies about $40%$ all double-electron capture collisions. The supports predictions molecular classical...

We have measured the mobility of negative ion species drifting in mixtures SF6 with N2, O2 and air. The pulsed Townsend experiment was used for this purpose. conditions experiment, high pressures low values reduced electric field, E/N, ensured that majority gap , to which present mobilities are ascribed. extrapolated, zero field several mixture compositions were test them successfully Blanc's law. Moreover, air could also be explained terms ionic N2 O2.

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...