Highly charged ions: Optical clocks and applications in fundamental physics

MG Kozlov, MS Safronova… - Reviews of Modern …, 2018 - APS
Recent developments in frequency metrology and optical clocks have been based on
electronic transitions in atoms and singly charged ions as references. The control over all …

Physics of laser-driven tin plasma sources of EUV radiation for nanolithography

OO Versolato - Plasma Sources Science and Technology, 2019 - iopscience.iop.org
Laser-produced transient tin plasmas are the sources of extreme ultraviolet (EUV) light at
13.5 nm wavelength for next-generation nanolithography, enabling the continued …

Prominent radiative contributions from multiply-excited states in laser-produced tin plasma for nanolithography

F Torretti, J Sheil, R Schupp, MM Basko… - Nature …, 2020 - nature.com
Extreme ultraviolet (EUV) lithography is currently entering high-volume manufacturing to
enable the continued miniaturization of semiconductor devices. The required EUV light, at …

The Heidelberg compact electron beam ion traps

P Micke, S Kühn, L Buchauer, JR Harries… - Review of Scientific …, 2018 - pubs.aip.org
Highly charged ions (HCIs) constitute a large class of atomic systems since each element
has as many ionization states as it has protons—in a sense, this extends the periodic table …

Microdroplet-tin plasma sources of EUV radiation driven by solid-state-lasers (Topical Review)

OO Versolato, J Sheil, S Witte, W Ubachs… - Journal of …, 2022 - iopscience.iop.org
Plasma produced from molten-tin microdroplets generates extreme ultraviolet light for state-
of-the-art nanolithography. Currently, CO 2 lasers are used to drive the plasma. In the future …

Efficient Generation of Extreme Ultraviolet Light From :YAG-Driven Microdroplet-Tin Plasma

R Schupp, F Torretti, RA Meijer, M Bayraktar… - Physical Review …, 2019 - APS
We experimentally investigate the emission of EUV light from a mass-limited laser-produced
plasma over a wide parameter range by varying the diameter of the targeted tin …

Sensitivity to new physics of isotope-shift studies using the coronal lines of highly charged calcium ions

NH Rehbehn, MK Rosner, H Bekker, JC Berengut… - Physical Review A, 2021 - APS
Promising searches for new physics beyond the current standard model (SM) of particle
physics are feasible through isotope-shift spectroscopy, which is sensitive to a hypothetical …

Anomalous plasma ionization balance induced by and metastable states

N Kimura, Priti, N Numadate, R Kodama, N Nakamura - Physical Review A, 2023 - APS
Metastable states in an atomic energy-level structure greatly influence atomic processes in
plasmas. In particular, high-energy long-lived metastable levels brought about by 5 s and 4 f …

EUV spectroscopy of highly charged ions in an electron-beam ion trap

J Scheers, C Shah, A Ryabtsev, H Bekker, F Torretti… - Physical Review A, 2020 - APS
Extreme-ultraviolet (EUV) spectra of Sn 13+− Sn 15+ ions have been measured in an
electron-beam ion trap (EBIT). A matrix inversion method is employed to unravel convoluted …

Joint measurement of electron density, temperature, and emission spectrum of Nd: YAG laser-produced tin plasma

Y Pan, K Tomita, A Sunahara, A Sasaki… - Applied Physics …, 2023 - pubs.aip.org
We present the results of joint measurements of electron density (⁠ ne⁠), temperature (⁠ T
e⁠), and emission spectra of an Nd: YAG-driven tin plasma. Collective Thomson scattering …