Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

ATOMKI Annual Report

Lifetime measurement of the metastable 1s2s2p 4 P J 0 state of the He - ion in a cryogenically cooled electrostatic ion-beam trap

Andrea Orbán, P. Reinhed, J.G. Werner, Stefan Rosén, Richard Thomas, Iryna Kashperka, Henrik Johansson, Deepankar Misra, H. Cederquist, Henning T. Schmidt, Lars Brännholm, M. Björkhage

Published Jan 1, 2011• 0 citations
OpenAlex

Related papers

Lifetime measurement of the metastable 4d^2D~5~/~2 state in ^8^8Sr^+ using a single trapped ion (8 pages)

V. Letchumanan

Physical Review A•Jan 1, 2005•1 citation

Precision Lifetime Measurements of He− in a Cryogenic Electrostatic Ion-Beam Trap

P. Reinhed, Andrea Orbán, J.G. Werner +9 more

We have developed a small purely electrostatic ion-beam trap which may be operated in thermal equilibrium at precisely controlled temperatures down to 10 K. Thus, we avoid magnetic field induced mixing of quantum states and may effectively eliminate any influence from absorption of photons from blackbody radiation. We report the first correction-free measurement of the lifetime of the 1s2s2p {4}P{5/2}{0} level of 4He(-) yielding the high-precision result 359.0 +/- 0.7 micros. This result is an essential proof-of-principle for cryogenic electrostatic storage rings and traps for atomic and molecular physics.

Physical Review Letters•Nov 18, 2009•54 citations

Ions in cold electrostatic storage devices

P. Reinhed

We have constructed a compact purely electrostatic ion-beam trap, ConeTrap, which we have mounted inside a double-walled vacuum chamber. In the inner vacuum chamber, we can obtain ultra-high vacuum (UHV) conditions and reach thermal equilibrium at well controlled temperatures down to 10 K. The chamber was constructed partly with the purpose of making high-precision measurements in ConeTrap, but also as a test-chamber for testing components (such as the detector-assembly tested and described in this thesis and paper III) to be used in the DESIREE (Double ElectroStatic Ion Ring ExpEriment) facility. The latter is a double electrostatic ion storage-ring being constructed at Stockholm University, in which the conditions are meant to mimic the environment in the interstellar medium. The interaction between two oppositely charged ions at very low relative velocities (controlled collision energies down to 10 meV) may then be studied in a section of the storage device where the two ion beams merge. The lifetime of loosely bound electronic systems, for example He-, is, at room temperature (and even at much lower temperatures), significantly affected by photons from blackbody radiation from the experimental device and its surroundings. The cryogenic temperature and low pressure obtained in the test chamber have made it possible to use ConeTrap to make the first correction-free lifetime measurement of the long-lived J=5/2 fine-structure level of the metastable 1s2s2p 4Po state of He-. Under the assumption of a statistical population of the fine-structure levels, at the time when the ions are created, we have also deduced the lifetimes of the short-lived J=1/2 and J=3/2 fine-structure levels. Furthermore, we have used ConeTrap to measure the pressure dependent storage lifetimes of He+ and Ar+ ions over wide ranges of temperatures and pressures, and we have thus been able to store positive ions with storage lifetimes of tens of seconds.

•Jan 1, 2010•1 citation

Lifetime of the He2(a3Σ+u metastable helium molecule in electron-bombarded solid helium

F. J. Soley, R. Leach, W. A. Fitzsimmons

Physics Letters A•Nov 1, 1975•4 citations

Metastable level lifetimes from electron-shelving measurements with ion clouds and single ions

Martina Knoop, C. Champenois, G. Hagel +4 more

arXiv:physics/0309094•The European Physical Journal D•Apr 30, 2004•38 citations

Radiative lifetime of metastable Xe3+ measured using an electrostatic ion beam trap

M. Saito, Asahi Chikaoka, T. Majima +2 more

We have measured the radiative lifetime of the 2 P 3/2 metastable level in Xe 3+ using an electrostatic ion beam trap. The lifetime was obtained by measuring the number of photons emitted during the 2 P 3/2 → 2 D 3/2 transition of Xe 3+ as a function of the storage time. The lifetime is compared with previously reported theoretical and experimental values.

Journal of Physics Conference Series•Jul 1, 2017•0 citations
We have developed a small purely electrostatic ion-beam trap which may be operated in thermal equilibrium at precisely controlled temperatures down to 10 K. Thus, we avoid magnetic field induced mixing of quantum states and may effectively eliminate any influence from absorption of photons from blackbody radiation. We report the first correction-free measurement of the lifetime of the 1s2s2p {4}P{5/2}{0} level of 4He(-) yielding the high-precision result 359.0 +/- 0.7 micros. This result is an essential proof-of-principle for cryogenic electrostatic storage rings and traps for atomic and molecular physics.
We have constructed a compact purely electrostatic ion-beam trap, ConeTrap, which we have mounted inside a double-walled vacuum chamber. In the inner vacuum chamber, we can obtain ultra-high vacuum (UHV) conditions and reach thermal equilibrium at well controlled temperatures down to 10 K. The chamber was constructed partly with the purpose of making high-precision measurements in ConeTrap, but also as a test-chamber for testing components (such as the detector-assembly tested and described in this thesis and paper III) to be used in the DESIREE (Double ElectroStatic Ion Ring ExpEriment) facility. The latter is a double electrostatic ion storage-ring being constructed at Stockholm University, in which the conditions are meant to mimic the environment in the interstellar medium. The interaction between two oppositely charged ions at very low relative velocities (controlled collision energies down to 10 meV) may then be studied in a section of the storage device where the two ion beams merge. The lifetime of loosely bound electronic systems, for example He-, is, at room temperature (and even at much lower temperatures), significantly affected by photons from blackbody radiation from the experimental device and its surroundings. The cryogenic temperature and low pressure obtained in the test chamber have made it possible to use ConeTrap to make the first correction-free lifetime measurement of the long-lived J=5/2 fine-structure level of the metastable 1s2s2p 4Po state of He-. Under the assumption of a statistical population of the fine-structure levels, at the time when the ions are created, we have also deduced the lifetimes of the short-lived J=1/2 and J=3/2 fine-structure levels. Furthermore, we have used ConeTrap to measure the pressure dependent storage lifetimes of He+ and Ar+ ions over wide ranges of temperatures and pressures, and we have thus been able to store positive ions with storage lifetimes of tens of seconds.