D. Hanstorp
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View article: Enhanced sensitivity for electron affinity measurements of rare elements
Enhanced sensitivity for electron affinity measurements of rare elements Open
The electron affinity (EA), the energy released when a neutral atom binds an additional electron, is a fundamental property of atoms that is governed by electron-electron correlations and is strongly related to an element’s chemical reacti…
View article: Compressed Ultrafast Photography of Plasmas Formed from Laser Breakdown of Dense Gases Reveals that Internal Processes Dominate Evolution at Early Times
Compressed Ultrafast Photography of Plasmas Formed from Laser Breakdown of Dense Gases Reveals that Internal Processes Dominate Evolution at Early Times Open
Compressed ultrafast photography (CUP) is applied to laser breakdown in argon and xenon under pressures up to 40atm to obtain 2D images of the plasma dynamics of single events with a spatial resolution of 250x100 pixels and an equivalent f…
View article: Laser spectroscopy and CP-violation sensitivity of actinium monofluoride
Laser spectroscopy and CP-violation sensitivity of actinium monofluoride Open
The apparent invariance of the strong nuclear force under combined charge conjugation and parity (CP) remains an open question in modern physics. Precision experiments with heavy atoms and molecules can provide stringent constraints on CP …
View article: Shining light on quantum phenomena through a levitated water droplet
Shining light on quantum phenomena through a levitated water droplet Open
Modeling the hydrogen atom is often considered an essential milestone in an introductory quantum mechanics course. Mathematically, the instructional path is clear: from the square potential well, through the harmonic potential, the three-d…
View article: Electron-induced chemistry and sputtering of volatile species from amorphous and crystalline water ice
Electron-induced chemistry and sputtering of volatile species from amorphous and crystalline water ice Open
Electron irradiation of water-rich ices plays a significant role in initiating the chemical and physical processes on the surface of airless icy bodies in radiation environments such as Europa and Enceladus, as well as on the Moon, comets,…
View article: Irradiation-driven Evaporation of Micro Droplets in an Optical Trap
Irradiation-driven Evaporation of Micro Droplets in an Optical Trap Open
Small droplets are irradiated with visible and infrared light in many natural and industrial environments. One of the simplest ways to describe their evaporation is the D$^2$-Law. It states that the evaporation rate is proportional to $t^{…
View article: Trajectory effects on charge exchange and energy loss in collisions of H$^+$, He$^{2+}$, Li$^{3+}$, and Be$^{4+}$ ions with atomic hydrogen
Trajectory effects on charge exchange and energy loss in collisions of H$^+$, He$^{2+}$, Li$^{3+}$, and Be$^{4+}$ ions with atomic hydrogen Open
The charge exchange and energy loss processes provide insights into fundamental processes across physical, chemical, and engineered systems. While this field has been thoroughly investigated, a clear study on trajectory effects is lacking,…
View article: High-speed tracking of coalescence and mixing of optically controlled droplets
High-speed tracking of coalescence and mixing of optically controlled droplets Open
We are presenting an all-optical platform for on-demand and nonintrusive studies of coalescence of micron-sized liquid droplets in air. The platform has the purpose to mimic the airborne conditions occurring in typical environments where d…
View article: $^{61}$Cr as a Doorway to the N = 40 Island of Inversion
$^{61}$Cr as a Doorway to the N = 40 Island of Inversion Open
This paper reports on the measurement of the ground-state spin and nuclear magnetic dipole moment of $^{61}$Cr. The radioactive ion beam was produced at the CERN-ISOLDE facility and was probed using high-resolution resonance ionization las…
View article: Unforeseen advantage of looser focusing in vacuum laser acceleration
Unforeseen advantage of looser focusing in vacuum laser acceleration Open
Acceleration of electrons in vacuum directly by intense laser fields holds great promise for the generation of high-charge, ultrashort, relativistic electron bunches. While the energy gain is expected to be higher with tighter focusing, th…
View article: Ultraviolet laser-induced fragmentation of hydrocarbon fuel droplets
Ultraviolet laser-induced fragmentation of hydrocarbon fuel droplets Open
The present study aims to understand droplet fragmentation due to instabilities from the radiative heating process. We focus on the plasma-induced breakup mechanism of iso-octane and n-hexane droplets from the nucleation of holes through s…
View article: Ionization potential of radium monofluoride
Ionization potential of radium monofluoride Open
The ionization potential (IP) of radium monofluoride (RaF) was measured to be 4.969(2)[10] eV, revealing a relativistic enhancement in the series of alkaline earth monofluorides. The results are in agreement with a relativistic coupled-clu…
View article: The electron affinity of rubidium: a state selective measurement
The electron affinity of rubidium: a state selective measurement Open
Negative ions, which are formed when an electron is attached to a neutral system, are unique quantum systems. The lack of a long-range Coulomb force causes the inter-electronic interactions to become relatively more important. As a consequ…
View article: Optical heterodyne microscopy of operating spin Hall nano-oscillator arrays
Optical heterodyne microscopy of operating spin Hall nano-oscillator arrays Open
Optical heterodyne detection is a powerful technique for characterizing a wide range of physical excitations. Here, we use two types of optical heterodyne detection techniques (fundamental and parametric pumping) to microscopically charact…
View article: Lifetimes of excited states in P-, As- and Sb-
Lifetimes of excited states in P-, As- and Sb- Open
Radiative lifetimes of three elements of the nitrogen group have been experimentally investigated at the Double ElectroStatic Ion Ring Experiment (DESIREE) facility at Stockholm University. The experiments were performed through selective …
View article: Precision measurements on Si-
Precision measurements on Si- Open
High-precision measurements of the electron affinities (EA) of the three stable isotopes of silicon, $^{28}$Si, $^{29}$Si and $^{30}$Si, have been performed at the cryogenic electrostatic ion-beam storage ring DESIREE. The quantum states o…
View article: Lifetimes of excited states in Rh-
Lifetimes of excited states in Rh- Open
The radiative decay of excited states of the negative ion of rhodium, Rh$^-$, has been investigated experimentally and theoretically. The experiments were conducted at the Double ElectroStatic Ion Ring Experiment (DESIREE) facility at Stoc…
View article: Radiative lifetime of the A 2Π1/2 state in RaF with relevance to laser cooling
Radiative lifetime of the A 2Π1/2 state in RaF with relevance to laser cooling Open
The radiative lifetime of the $A$ $^2 Π_{1/2}$ (v=0) state in radium monofluoride (RaF) is measured to be 35(1) ns. The lifetime of this state and the related decay rate $Γ= 2.86(8) \times 10^7$ $s^{-1}$ are of relevance to the laser cooli…
View article: High-resolution measurement of the electron affinity of cesium
High-resolution measurement of the electron affinity of cesium Open
Negative ions are unique quantum systems where electron correlation plays a decisive role in determining their properties. The lack of optically allowed transitions prevents traditional optical spectroscopy and the electron affinity is, th…
View article: Drones as observers and students as data points: a large-scale demonstration of sound waves
Drones as observers and students as data points: a large-scale demonstration of sound waves Open
Sound is central in everyday life, and the physics of sound is present in many parts of physics education. A common way to teach physics concepts is to conduct experiments or show a phenomenon through demonstrations. However, it is far fro…
View article: Precision spectroscopy and laser cooling scheme of a radium-containing molecule
Precision spectroscopy and laser cooling scheme of a radium-containing molecule Open
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…
View article: Phase and frequency-resolved microscopy of operating spin Hall nano-oscillator arrays
Phase and frequency-resolved microscopy of operating spin Hall nano-oscillator arrays Open
An efficient platform to perform phase imaging and individual nano-addressing for application in novel SHNO-based computing devices.
View article: Observation of the distribution of nuclear magnetization in a molecule
Observation of the distribution of nuclear magnetization in a molecule Open
Rapid progress in the experimental control and interrogation of molecules, combined with developments in precise calculations of their structure, are enabling new opportunities in the investigation of nuclear and particle physics phenomena…
View article: Unforeseen advantage of looser focusing in vacuum laser acceleration
Unforeseen advantage of looser focusing in vacuum laser acceleration Open
Acceleration of electrons in vacuum directly by intense laser fields, often termed vacuum laser acceleration (VLA), holds great promise for the creation of compact sources of high-charge, ultrashort, relativistic electron bunches. However,…
View article: Pinning down electron correlations in RaF via spectroscopy of excited states and high-accuracy relativistic quantum chemistry
Pinning down electron correlations in RaF via spectroscopy of excited states and high-accuracy relativistic quantum chemistry Open
We report the spectroscopy of the 14 lowest excited electronic states in the radioactive molecule radium monofluoride (RaF). The observed excitation energies are compared with fully relativistic state-of-the-art Fock-space coupled cluster …