The Canadian fuel cell R&amp;D program

Beck, Nataly; Hammerli, M.

doi:10.2172/460302

Cited by 191 publications

(346 citation statements)

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“…The df dE term is evaluated using a modified version [27] of our code for bound states [21,28], the core of which is to compute the transition matrix element. This modified version has been used to successfully reproduce the experimental photoelectron spectrum of Ce − [14].…”

Section: B Photodetachment Cross Sectionmentioning

confidence: 99%

“…For each V nβ , the angular structure of all the R k and I integrals are generated by the RCI code [31]. One computational difficulty we came across is that our εp is generated orthogonal to the np's (n ≤ 6), but is not orthogonal to the virtual p's.…”

Section: B Photodetachment Cross Sectionmentioning

confidence: 99%

“…(5) into (7) to calculate the transition matrix elements, the electric-dipole matrix element of the resonance state is extracted from the bound state code [21,28]. The modification to this matrix element due to the admixture of the continuum states was neglected in [30] but has been explicitly included here.…”

Section: B Photodetachment Cross Sectionmentioning

confidence: 99%

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Experimental and theoretical study of bound and quasibound states ofCe−

Walter

Gibson

et al. 2011

Phys. Rev. A

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The negative ion of cerium is investigated experimentally with tunable infrared laser photodetachment spectroscopy and theoretically with relativistic configuration interaction in the continuum formalism. The relative cross section for neutral atom production is measured with a crossed ionbeam-laser-beam apparatus over the photon energy range 0.54 -0.75 eV. A rich resonance spectrum is revealed near threshold, with at least twelve peaks observed due to transitions from bound states of Ce − to either bound or quasi-bound excited states of the negative ion. Theoretical calculations of the photodetachment cross sections enable identification of the transitions responsible for the measured peaks. Two of the peaks are due to electric-dipole-allowed bound-bound transitions in Ce − , making cerium only the second atomic negative ion that has been demonstrated to support multiple bound states of opposite parity. In addition, combining the experimental data with the theoretical analysis determines the electron affinity of cerium to be 0.628(10) eV and the fine structure splitting of the ground state of Ce − ( 4 H 7/2 -4 H 9/2 ) to be 0.09775(4) eV.

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Section: B Photodetachment Cross Sectionmentioning

confidence: 99%

Section: B Photodetachment Cross Sectionmentioning

confidence: 99%

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Experimental and theoretical study of bound and quasibound states ofCe−

Walter

Gibson

et al. 2011

Phys. Rev. A

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“…For Fe II, the J = 9/2 o matrix order could easily exceed 50 000, if nothing were done. The RCI matrix size can be substantially lowered by employing a formally first order procedure which we call REDUCE [4,15]. Essentially, one rotates the full basis set for the correlation manifold to maximize the number of zero matrix elements the rotated basis makes with the reference functions.…”

mentioning

confidence: 99%

“…Such excitations normally affect the velocity operator more. Second, the f value program [24] supplies an analysis table which lists the most important contributors to the transition matrix element. These generally involve at least one reference function.…”

mentioning

confidence: 99%

Ab InitioElectric Dipolefvalues for Fe II (3d⁶4s + 3d⁷)J= 9/2 → 3d⁶4pJ= 9/2 Transitions

Beck¹

2005

Phys. Scr.

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Comparisons and connections between mean field dynamo theory and accretion disc theory

Blackman¹

2009

Astron Nachr

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The origin of large scale magnetic fields in astrophysical rotators, and the conversion of gravitational energy into radiation near stars and compact objects via accretion have been subjects of active research for a half century. Magnetohydrodynamic turbulence makes both problems highly nonlinear, so both subjects have benefitted from numerical simulations.However, understanding the key principles and practical modeling of observations warrants testable semi-analytic mean field theories that distill the essential physics. Mean field dynamo (MFD) theory and alpha-viscosity accretion disc theory exemplify this pursuit. That the latter is a mean field theory is not always made explicit but the combination of turbulence and global symmetry imply such. The more commonly explicit presentation of assumptions in 20th century textbook MFDT has exposed it to arguably more widespread criticism than incurred by 20th century alpha-accretion theory despite complementary weaknesses. In the 21st century however, MFDT has experienced a breakthrough with a dynamical saturation theory that consistently agrees with simulations. Such has not yet occurred in accretion disc theory, though progress is emerging. Ironically however, for accretion engines, MFDT and accretion theory are presently two artificially uncoupled pieces of what should be a single coupled theory. Large scale fields and accretion flows are dynamically intertwined because large scale fields likely play a key role in angular momentum transport. I discuss and synthesize aspects of recent progress in MFDT and accretion disc theory to suggest why the two likely conspire in a unified theory.

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The Canadian fuel cell R&D program

Cited by 191 publications

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Experimental and theoretical study of bound and quasibound states ofCe−

Experimental and theoretical study of bound and quasibound states ofCe−

Ab InitioElectric Dipolefvalues for Fe II (3d⁶4s + 3d⁷)J= 9/2 → 3d⁶4pJ= 9/2 Transitions

Comparisons and connections between mean field dynamo theory and accretion disc theory

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The Canadian fuel cell R&D program

Cited by 191 publications

References 0 publications

Experimental and theoretical study of bound and quasibound states ofCe−

Experimental and theoretical study of bound and quasibound states ofCe−

Ab InitioElectric Dipolefvalues for Fe II (3d64s + 3d7)J= 9/2 → 3d64pJ= 9/2 Transitions

Comparisons and connections between mean field dynamo theory and accretion disc theory

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Ab InitioElectric Dipolefvalues for Fe II (3d⁶4s + 3d⁷)J= 9/2 → 3d⁶4pJ= 9/2 Transitions