4 research outputs found
Voltage scanning and technical upgrades at the Collinear Resonance Ionization Spectroscopy experiment
To optimize the performance of the Collinear Resonance Ionization
Spectroscopy (CRIS) experiment at CERN-ISOLDE, technical upgrades are
continuously introduced, aiming to enhance its sensitivity, precision,
stability, and efficiency. Recently, a voltage-scanning setup was developed and
commissioned at CRIS, which improved the scanning speed by a factor of three as
compared to the current laser-frequency scanning approach. This leads to faster
measurements of the hyperfine structure for systems with high yields (more than
a few thousand ions per second). Additionally, several beamline sections have
been redesigned and manufactured, including a new field-ionization unit, a
sharper electrostatic bend, and improved ion optics. The beamline upgrades are
expected to yield an improvement of at least a factor of 5 in the
signal-to-noise ratio by suppressing the non-resonant laser ions and providing
time-of-flight separation between the resonant ions and the collisional
background. Overall, the presented developments will further improve the
selectivity, sensitivity, and efficiency of the CRIS technique.Comment: 10 pages. Under review at NIM B as part of the proceedings of EMIS
2022 at RAON, South Kore
The electron affinity of astatine
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, 211At, is remarkably well suited for targeted radionuclide therapy of cancer. With the Atâ 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 electronâelectron 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
The electron affinity of astatine
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, 211At, is remarkably well suited for targeted radionuclide therapy of cancer. With the Atâ 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)âeV. 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 electronâelectron 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.peerReviewe
Precision spectroscopy and laser cooling scheme of a radium-containing molecule
We are attaching the processed spectra used for the analysis in our paper, "Precision spectroscopy and laser cooling scheme of a radium-containing molecule", together with an example of a Python script used to fit individual peaks in these spectra. We are also attaching a PGOPHER file containing a fitted spectra for the 0ââ0ââ and 1ââ1ââ rovibronic transitions