An ion beam apparatus for collinear photodetachment experiments

Hanstorp, Dag

doi:10.1016/0168-583x(94)00656-3

Cited by 28 publications

(13 citation statements)

References 17 publications

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“…This implies a velocity spread of the ions which is compressed due to the acceleration over a high potential in the subsequent ion beam extraction process 54 . The compressed velocity spread of the ions is given by the expression Δv ¼ ΔW= ffiffiffiffiffiffiffiffiffiffiffi 2mW p , where m is the ion mass, ΔW the energy spread of the ions and W the kinetic energy of the ion beam 55 . The velocity spread of the ion beam can be converted to a spread of the frequency of the laser light of Δν = Δv/λ seen by the ions.…”

Section: Methodsmentioning

confidence: 99%

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The electron affinity of astatine

et al. 2020

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One of the most important properties influencing the chemical behavior of an element is the electron affinity (EA). Among the remaining elements with unknown EA is astatine, where one of its isotopes, 211 At, is remarkably well suited for targeted radionuclide therapy of cancer. With the At − anion being involved in many aspects of current astatine labeling protocols, the knowledge of the electron affinity of this element is of prime importance. Here we report the measured value of the EA of astatine to be 2.41578(7) eV. This result is compared to state-of-the-art relativistic quantum mechanical calculations that incorporate both the Breit and the quantum electrodynamics (QED) corrections and the electron-electron correlation effects on the highest level that can be currently achieved for many-electron systems. The developed technique of laser-photodetachment spectroscopy of radioisotopes opens the path for future EA measurements of other radioelements such as polonium, and eventually super-heavy elements.

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Section: Methodsmentioning

confidence: 99%

“…The compressed velocity spread of the ions is given by the expression , where m is the ion mass, Δ W the energy spread of the ions and W the kinetic energy of the ion beam 55 . The velocity spread of the ion beam can be converted to a spread of the frequency of the laser light of Δ = Δ v / λ seen by the ions.…”

Section: Methodsmentioning

confidence: 99%

The electron affinity of astatine

et al. 2020

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“…These electrons are guided by an electric field to a Channeltron Electron Multiplier (CEM). A more thorough description of this scheme and the neutral particle detector can be found in [22,23]. A sketch of the whole setup is shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

The ILIAS project for selective isobar suppression by laser photodetachment

Forstner

Andersson

Hanstorp

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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“…A more detailed description of the detector is available elsewhere. 21 Two optical parametric oscillator (OPO) lasers could be used to act as photon sources in photodetachment experiments. Both systems yield ∼6 ns pulses at 10 Hz repetition rate in the wavelength range from 220 to 5000 nm, which corresponds to wavenumbers of 2000-45000 cm −1 .…”

Section: Photodetachment Experimentsmentioning

confidence: 99%

“…21, was designed for photodetachment studies using pulsed lasers in a collinear geometry. Following laser interaction, fast neutral atoms are detected as a function of experimental parameters, such as laser wavelength or power density.…”

Section: Description Of the Apparatus At Gunillamentioning

confidence: 99%

Ion optical design of a collinear laser-negative ion beam apparatus

Diehl

Wendt

Lindahl

et al. 2011

Review of Scientific Instruments

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An apparatus for photodetachment studies on atomic and molecular negative ions of medium up to heavy mass (M ≃ 500) has been designed and constructed. Laser and ion beams are merged in the apparatus in a collinear geometry and atoms, neutral molecules and negative ions are detected in the forward direction. The ion optical design and the components used to optimize the mass resolution and the transmission through the extended field-free interaction region are described. A 90° sector field magnet with 50 cm bending radius in combination with two slits is used for mass dispersion providing a resolution of M∕ΔM≅800 for molecular ions and M∕ΔM≅400 for atomic ions. The difference in mass resolution for atomic and molecular ions is attributed to different energy distributions of the sputtered ions. With 1 mm slits, transmission from the source through the interaction region to the final ion detector was determined to be about 0.14%.

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An ion beam apparatus for collinear photodetachment experiments

Cited by 28 publications

References 17 publications

The electron affinity of astatine

The electron affinity of astatine

The ILIAS project for selective isobar suppression by laser photodetachment

Ion optical design of a collinear laser-negative ion beam apparatus

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