Calculated Zeeman patterns for the perturbed rotational levels of CN

Case (1). H12 / 0, M12 =0. As F is increased from zero there will be a series of A J = 0, AM = 0 anticrossings, one for each value of M / 0, which occur at field strengths of 

The lowest field anticrossing will involve M = J, and the M and M — 1 anticrossings will occur at field strengths differing by 

The lineshape of an isolated anticrossing is related to the variation with F of (2M 1M,F 2, the fractional 2M) basis function character admixed into the nominal 1 M,F) eigenfunction. The shape of an anticrossing signal depends on the specific methods of excitation and detection (Miller, 1973), but (2M 1M, F) 2 is a crucial factor. For case (1) crossings, each isolated anticrossing signal will have a symmetric lineshape, 

Case (2). H 2 = 0,Mi2 0. The only difference from case (1) is that 

Another consequence of the interference betweenH2 and Hfield is manifest as an asymmetry in the behavior of rotational levels above and below a zero-field level crossing. Let E — E = A 0 then the crossings occur at 

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Figure 6.15 Calculated Zeeman patterns for the perturbed rotational levels of CN A2If (v = 10) B2 + (v = 0). Only the 2II A-doublet and 0-components involved in the perturbation are shown. The horizontal axis is labeled in units of /ro(4.6688 x 10-5 cm 1/G) multiplied by the magnetic field (H) to give reciprocal centimeters rather than Gauss. [FVom Radford and Broida (1962).]... 

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