Spin-exchange collisions of the ground state of Cs atoms in a high magnetic field

Cs atoms were optically pumped with a Ti:sapphire laser in a magnetic field of 1.516 T. Steady absorption spectra and populations of Zeeman sublevels of the ground state of Gs in N-2 gas at various pressures (5, 40, and 80 To rr) were obtained. The results show that in a high magnetic field, the comb ined electron-nuclear spin transition (flip-flop transition), which is main ly induced by the collision modification delta a(J . I) of hyperfine intera ction, is an important relaxation mechanism at high buffer-gas pressures.