Skip to main content

Reset your password

Please enter the e-mail address you used to register to reset your password

Note: The verification e-mail to change your password should arrive immediately. However, in some cases it takes longer. Don't forget to check your spam folder.

If you haven't received the e-mail in 24 hours, please contact customerservices@ioppublishing.org

Registration complete

Thank you for registering with Physics World
If you'd like to change your details at any time, please visit My account

Close
Structure and dynamics

Structure and dynamics

Home » Atomic and molecular » Structure and dynamics » The subtle secrets of exotic helium

The subtle secrets of exotic helium

27 Mar 2003

Hyperfine structure has been observed in helium atoms in which one of the electrons has been replaced by an antiproton, providing a test of CPT symmetry

Since Niels Bohr presented his revolutionary model of the atom in 1913, physicists have come a long

You’ve reached the limit of what you can view on Physics World without registering

If you already have an account on Physics World, then please sign in to continue reading

If you do not yet have an account, please register so you can

  • Access more than 20 years of online content
  • Choose which e-mail newsletters you would like to receive
Back to Structure and dynamics Structure and dynamics

Read previous Balancing atoms probe fundamental symmetries

Read next Radio waves measure body water

Discover more from Physics World

Related jobs

Related events

Copyright © 2026 by IOP Publishing Ltd and individual contributors