The Manne Siegbahn Laboratory was a research facility, finally within Fysikum, the physics department of Stockholm University. The laboratory was performing research and development in accelerator physics. The main experimental equipment at the laboratory was for many years the CRYRING accelerator facility. CRYRING was used for experiments in, mainly, atomic and molecular physics from 1992 to the end of 2009. It has now been moved to Darmstadt in Germany, where it will be used for deceleration of antiprotons and heavy ions at the FLAIR facility at FAIR. The laboratory was also building a small, double electrostatic storage ring DESIREE. Within the Stockholm-Uppsala Centre for Free Electron Laser Research MSL also participates in the development of the European XFEL at DESY in Hamburg, Germany.


The CRYRING facility at MSL consisted of several ion sources, including an ECR cource on a 300 kV platform and an EBIS, an RFQ linear accelerator and a 1.44 Tm synchrotron and storage ring with electron cooling. Experiments were performed with beams at low energies directly from the ion sources or at higher energies in the ring.

The scientific programme was concentrated to atomic and molecular physics, either of fundamental nature or with applications in areas like astrophysics, astrochemistry, atmospheric physics and chemistry or combustion. The experimental activities also included accelerator physics, presicion mass measurements and a small amount of applied physics.

Examples of specific fields of research were

- Collisions between highly charged ions and fullerenes
- Interactions between highly charged ions and surfaces
- Atomic mass measurements using highly charged ions in a Penning trap
- Lifetime measurements of excited atomic states using laser spectroscopy on ions stored in the ring
- Studies of radiative and dielectronic recombination between stored highly charged ions and electrons in the electron cooler
- Cross sections and branching ratios for dissociative recombination of molecular ions in the electron cooler
- Collisions between fast ions and atoms in the CRYRING gas-jet target
- Studies of ordered beams in the ring

More detailed information about the experiments can be found at the homepages of the user groups.


DESIREE is a double electrostatic storage ring designed for experiments with merged beams of positive and negative ions, such as studies of mutual neutralization between two singly charged ions. It can also be used for single-beam experiments like measurements of atomic lifetimes or investigations of the physical properties of biomolecules.

DESIREE is now installed and in use at Fysikum, the physics department of Stockholm University.

Other projects

The laboratory was involved in several external activities, such as participation in the design study for EURISOL, the future European ISOL facility for radioactive beams; EBIS development together with JINR, Dubna; the REX-ISOLDE project where the laboratory has developed and built an EBIS ion source; collaboration with the Karolinska Institute on development of equipment for cancer therapy, etc.