Absolute photoionization cross sections of the Ba ground state in the autoionization region: I. 238 - 218 nm

Maeda, Kengo; Aymar, M; Ueda, Kiyoshi; Chiba, H.; Ohmori, Kenji; Sato, Yukinori; West, John B.; Ross, K J; Ito, Kenji

doi:10.1088/0953-4075/30/14/010

Cited by 10 publications

(7 citation statements)

References 20 publications

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“…shows a significant energy dependence as noted previously (Gounand et al 1991, Abutaleb et al 1991, Maeda et al 1997, whereas the quantum defects for…”

Section: Parametrization Of the Resonance Profilessupporting

confidence: 80%

“…Recently, we measured the absolute photoionization cross sections in the autoionization region of 238-218 nm and compared the results with eigenchannel R-matrix calculations combined with multichannel quantum defect theory (MQDT) (Maeda et al 1997; hereafter referred to as paper I). Analysing the lineshapes of the experimental data we found that the 5d( 2 D 3/2 )np[ 1 2 ] series is much more perturbed than the other series.…”

Section: Introductionmentioning

confidence: 99%

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Absolute photoionization cross sections of the Ba ground state in the autoionization region: II. 221-209 nm

Maeda¹,

Ueda²,

Aymar³

et al. 2000

J. Phys. B: At. Mol. Opt. Phys.

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Absolute photoionization cross sections of Ba in the autoionization region of 209-221 nm have been measured with a bandwidth of 0.0014 nm. The measured cross sections are compared with those obtained from R-matrix calculations combined with multichannel quantum defect theory (MQDT) techniques. The variations of the experimental lineshape parameters for the 5d(2D3/2)np[½] and 5d(2D5/2)np[3/2] series are analysed with empirical three-channel MQDT models. From the calculation of partial density of states in 6pns channels, the perturber of the 5d(2D3/2)np[½] series is confirmed to be the 6p7s 3P1 level and that of the 5d(2D5/2)np[3/2] series is identified as the 6p7s 1P1 level.

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“…shows a significant energy dependence as noted previously (Gounand et al 1991, Abutaleb et al 1991, Maeda et al 1997, whereas the quantum defects for…”

Section: Parametrization Of the Resonance Profilessupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Absolute photoionization cross sections of the Ba ground state in the autoionization region: II. 221-209 nm

Maeda¹,

Ueda²,

Aymar³

et al. 2000

J. Phys. B: At. Mol. Opt. Phys.

Self Cite

View full text Add to dashboard Cite

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“…and calculate analytically the transfer matrix M and the transmission coefficient (16). Again, we observe that there exist N perfect reflections at the frequencies of the eigenstates of the N -level Fano defect, as discussed above.…”

Section: Additional Defects In the Main Arraymentioning

confidence: 59%

“…In the corresponding transmission dependencies, the interference effect leads to either perfect transmission or perfect reflection, producing a sharp asymmetric response. This kind of the wave resonance is also common in different interferometer devices such as the Aharonov-Bohm interferometer [15] and the Mach-Zehnder interferometer [16].…”

Section: Introductionmentioning

confidence: 87%

Engineering Fano resonances in discrete arrays

Miroshnichenko

Kivshar

2005

Phys. Rev. E

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We study transmission properties of discrete arrays composed of a linear waveguide coupled to a system of N side defect states. This simple system can be used to model discrete networks of coupled defect modes in photonic crystals, complex waveguide arrays in two-dimensional nonlinear lattices, and ring-resonator structures. We demonstrate the basic principles of the resonant scattering management through engineering Fano resonances and find exact results for the wave transmission coefficient. We reveal conditions for perfect reflections and transmissions due to either destructive or constructive interferences, and associate them with Fano resonances, also demonstrating how these resonances can be tuned by nonlinear defects.

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“…70 One expects that the interaction giving rise to the structure in the photoionization spectrum will be affected by the presence of helium since the ionization threshold is lowered by the helium while Rydberg states having low principal quantum numbers are shifted up in energy. However, it is unclear how exactly this will modify the photoionization spectrum.…”

Section: Discussionmentioning

confidence: 99%

Spectroscopy and dynamics of barium-doped helium nanodroplets

Loginov

Drabbels

2012

The Journal of Chemical Physics

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Excitation spectra up to the ionization threshold are reported for barium atoms located on the surface of helium nanodroplets. For states with low principal quantum number, the resonances are substantially broadened and shifted towards higher energy with respect to the gas phase. This has been attributed to the repulsive interaction of the excited atom with the helium at the Franck-Condon region. In contrast, for states with high principal quantum number the resonances are narrower and shifted towards lower energies. Photoelectron and ZEKE spectroscopy reveal that the redshift results from a lowering of the ionization threshold due to polarization of the helium by the barium ionic core. As a result of the repulsive interaction with the helium, excited barium atoms desorb from the surface of the droplets. Only when excited to the 6s6p 1 P 1 state, which reveals an attractive interaction with the helium, the atoms remain attached to the droplets.

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Absolute photoionization cross sections of the Ba ground state in the autoionization region: I. 238 - 218 nm

Cited by 10 publications

References 20 publications

Absolute photoionization cross sections of the Ba ground state in the autoionization region: II. 221-209 nm

Absolute photoionization cross sections of the Ba ground state in the autoionization region: II. 221-209 nm

Engineering Fano resonances in discrete arrays

Spectroscopy and dynamics of barium-doped helium nanodroplets

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