Zeeman effect lifetime

The collisional broadening rates are in good agreement with those observed in Na2 by Tsai ( ). The natural linewidths are larger than what one would expect from the lifetime measurements of Demtrdder et (10). The additional broadening (7 MHz for Na2 and 20 MHz for Li77 could result from an unresolved hyperfine structure or from the Zeeman effect produced by the oven heating wire. 

Radford (1961, 1962) and Radford and Broida (1962) presented a complete theory of the Zeeman effect for diatomic molecules that included perturbation effects. This led to a series of detailed investigations of the CN B2E+ (v — 0) A2II (v = 10) perturbation in which many of the techniques of modern high-resolution molecular spectroscopy and analysis were first demonstrated anticrossing spectroscopy (Radford and Broida, 1962, 1963), microwave optical double resonance (Evenson, et at, 1964), excited-state hyperfine structure with perturbations (Radford, 1964), effect of perturbations on radiative lifetimes and on inter-electronic-state collisional energy transfer (Radford and Broida, 1963). A similarly complete treatment of the effect of a magnetic field on the CO a,3E+ A1 perturbation complex is reported by Sykora and Vidal (1998). The AS = 0 selection rule for the Zeeman Hamiltonian leads to important differences between the CN B2E+ A2II and CO a/3E+ A1 perturbation plus Zeeman examples, primarily in the absence in the latter case of interference effects between the Zeeman and intramolecular perturbation terms. 

S. Svanberg Perturbations in Rydberg sequences probed by lifetime, Zeeman-effect and hyperfine structure measurements, in [Ref.9.23, p. 301]... 

Comparison with the Zeeman effect in optical spectroscopy. In optical double-resonance experiments the Doppler shift due to the motion of an atom through the r.f. magnetic field is negligible in comparison with the natural width of the excited levels. Substituting into equation (16.21) a typical atomic lifetime of 10" s leads to a line-width for the magnetic resonance signal, at low r.f. power of... 

The T processes effectively limit the lifetime of the Zeeman states, and this broadening effect amounts to h/2n)T. Because the Tis for carbons are long (10-1000 s), this effect is negligible for solids. 

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