Thanks for the help

1. Practical expression for atomic oscillator strength. Develop a general formula for the cross section of a gaussian atomic transition in the form o = KF/Av, where K is a numerical constant (which you should evaluate); F is the oscillator strength of the atomic transition; and Av is the doppler linewidth of the transition expressed in units of wavenumbers or cm-1.2. Saturation lineshape for the reactive part of a homogeneous two-level atomic transition. How will the atomic phase shift AmL, as contrasted to the atomic gain or absorption coefficient am L, saturate in a homogeneous atomic medium? To examine this, suppose that a signal wave having fixed intensity / but variable frequency w is transmitted through a thin slab of lorentzian, homogeneously saturable absorbing medium of thickness L; and the added phase shift ABm(w)L caused by the atoms is measured as a function of w. Let the absorption in the cell be fairly small, say, 20L = 0.1, so that the intensity I(z) is essentially constant throughout the cell. Plot the variation of ABm(w)L versus w for selected values of I/ Isat both 1. How does the spacing between the peaks of Bm(w) L change with increasing intensity