| List of ISOLDE experimental setups | |
|---|---|
| COLLAPS,CRIS,EC-SLI, IDS,ISS,ISOLTRAP,LUCRECIA,Miniball,MIRACLS,SEC,VITO,WISArD | |
| Other facilities | |
| MEDICIS | Medical Isotopes Collected from ISOLDE |
| 508 | Solid State Physics Laboratory |
TheEmission Channeling with Short-Lived Isotopes (EC-SLI) experiment is a permanent setup located within theISOLDE facility andCERN. The purpose of the experiment is to studylattice locations ofdopants andimpurities in both singlecrystals andepitaxialthin films. The experiment uses short-livedisotopes from the ISOLDE on-linebeamline, as well as longer-lived isotopes from three off-line beamlines.[1]
The EC-SLI experiment uses the method ofemission channelling (EC) to identify the position of short-lived isotopes in a single crystal lattice.[2] Radioactive isotope probes are introduced into the crystal usingion implantation, and apositron-sensitive detector detects its decay particles. The particles that the isotope emits interact with theelectrons andnuclei of the crystal's atoms, and experiencechanneling and blocking effects on their way out of the crystal.[3]
The yield of the emitted particles is dependent on the position of the detector relative to thecrystallographic axes. Therefore, the position of the isotope within the lattice can be determined by taking measurements of electronintensity and comparing them tosimulated results.[4] The emission patterns produced are characteristic of the lattice sites occupied by the isotopes, determining its functional properties (i.e.n-type orp-type doping).[5] The benefits of emission channelling include an increase inefficiency by roughly four orders of magnitude and the study of elements lighter than the host atoms used.[6]
The experimental setup for the EC-SLI experiment is assembled on an adjustable frame structure with three sections: a beam tube andcollimation chamber, experimental, and avacuum block. It is mounted to the GHM beamline at the ISOLDE facility.[7]
The emission channelling measurements take place in a cylindrical-shaped chamber after the samples are implanted and cooled. Uponflanges inserted along the chamber's perimeter, are auxiliary devices including acryogenic cooler,Faraday cup, view ports and a load lock. Special format flanges mount electron detector cases, links to the vacuum station, a lighteningquartz lamp, thethermal shieldactuator feedthrough, andgoniometers, at various points around the chamber. Two rigidly aligned collimators connect to a beam transport tube, allowing the ISOLDE ion beams to be optimally transported and focused.[7]
The EC-SLI experiment has been successfully involved in determining the lattice locations of short-lived isotopes in a variety of semiconductor materials.[8] The focus of emission channeling experiments at ISOLDE are investigations into lattice locations oftransition metal probes, and p-type doping using short-livedalkaline earth probes or long-lived probes.[6]
A current research aim is to continue the characterisation of quantum colour centres indiamond using the emission channeling technique, in order to correlate lattice locations withoptical properties.[9]