Breit-Wigner resonance

Figure 10. Phase lag spectrum of HI in the vicinity of the fe3IIi Breit-Wigner resonance. Panel (a) shows the phase lag between the photoionization of HI and H2S. Panel (b) is the three-photon photoionization spectrum of HI, showing the rotational structure of the two-photon fe3IIi - X1 1 transition. The bottom two panels are the one-photon ionization spectra of HI and H2S. (Reproduced with permission from Ref. 33, Copyright 2000 American Physical Society.)...

Breit-Wigner resonances have Lorentzian line shapes /bw( ) = [( — l res)2+(Wres/2)2] and are symmetrical in E (where W is the width of the resonance at half-height, see Section 2.1). In contrast, Fano83 resonances have a different lineshape ... 

We have developed an unified adiabatic approach allowing one to tackle transport problems in traps of different geometry. The magnetic and electrical fields, charge screening, and other factors (a spin-orbit interaction, hyperfine structure, etc) can influence the quantum dot paths within an easily tractable Breit-Wigner-resonance approximation for the electron scattering. The utility... 

Finally, it should be pointed out that the general result (4.233) may be used to compute the temperature coefficient (i.e., temperature dependence) of a Breit-Wigner resonance (see Sec. 6.5g). This has considerable practical significance from the standpoint of reactor control. 

The most natural theoretical treatment of this mechanism is based on the notion of Breit-Wigner resonances [78, 80, 442]. This treatment yields an expression for kj. coinciding with that obtained from the simple kinetic scheme... 

The Z-boson mass listed here corresponds to a Breit-Wigner resonance parameter. It lies approximately 34 MeV above the real part of the position of the pole (in the energy-squared plane) in the Z-boson propagator. 

---