Related Experiment Video
Updated: Jul 30, 2026

Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
Efficient propagation of polarization from laser photons to positrons through compton scattering and
1KEK: High Energy Accelerator Research Organization, Tsukuba-shi, Ibaraki 305-0801, Japan.
Abstract:
We have demonstrated for the first time the production of highly polarized short-pulse positrons with a finite energy spread in accordance with a new scheme that consists of two-quantum processes, such as inverse Compton scattering and electron-positron pair creation. Using a circularly polarized laser beam of 532 nm scattered off a high-quality, 1.28 GeV electron beam, we have obtained polarized positrons with an intensity of 2 x 10(4) e+ /bunch. The magnitude of positron polarization has been determined to be 73 +/- 15(stat) +/- 19(syst)% by means of a newly designed positron polarimeter.
Related Concept Videos
The de Broglie Wavelength
π Electron Effects on Chemical Shift: Overview
Interaction of EM Radiation with Matter: Spectroscopy
Positron Emission Tomography
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...
Deactivation Processes: Jablonski Diagram
Carrier Generation and Recombination
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...

