If I=0, then j=s,mj=ms, and the "good" states are the same (nms)for weak and strong fields. DetermineEz1(from Equation) and the fine structure energies (Equation 6.67), and write down the general result for the I=O Zeeman Effect - regardless of the strength of the field. Show that the strong field formula (Equation 6.82) reproduces this result, provided that we interpret the indeterminate term in square brackets as.

Short Answer

Expert verified

The EZ1=e2mBext2msħand the fine structure energies is

E=-13.6eVn21+α2n2n-34+2msBexteħ2m

Step by step solution

01

Definition of Zeeman Effect.

In the presence of a static magnetic field, the Zeeman Effect causes a spectral line to break into numerous components.

02

Step2: Structural isomers of carboxylic acids.

Use the equation 6.72,

Ez1=e2mBext.L+2S=e2mBext2msħ

Fine structure energy (with j=1/2),

Enj=-13.6eVn21+α2n2n-34Etot=-13.6eVn21+α2n2n-34+2mSBext2m

Fine structure term is proportional to α2;

Efs1=-13.6eVn4α2n-34=13.6eVn3α234n-1

{Same as equation } with the term in square brackets set equal to 1.

Efs1=13.6eVn3α234n-II+1-mImsII+1/2I+1

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Most popular questions from this chapter

Question: In the text I asserted that the first-order corrections to an n-fold degenerate energy are the eigen values of the Wmatrix, and I justified this claim as the "natural" generalization of the case n = 2.

Prove it, by reproducing the steps in Section 6.2.1, starting with

ψ0=j=1nαjψj0

(generalizing Equation 6.17), and ending by showing that the analog to Equation6.22 can be interpreted as the eigen value equation for the matrix W.

Problem 6.6 Let the two "good" unperturbed states be

ψ±0=α±ψa0+β±ψb0

whereα±andβ±are determined (up to normalization) by Equation 6.22(orEquation6.24). Show explicitly that

(a)are orthogonal;role="math" localid="1655966589608" (ψ+0ψ-0=0);

(b) ψ+0|H'|ψ-0=0;

(c)ψ±0|H'|ψ±0=E±1,withE±1given by Equation 6.27.

Question: Evaluate the following commutators :

a)[L·S,L]

b)[L·S,S]

c)role="math" localid="1658226147021" [L·S,J]

d)[L·S,L2]

e)[L·S,S2]

f)[L·S,J2]

Hint: L and S satisfy the fundamental commutation relations for angular momentum (Equations 4.99 and 4.134 ), but they commute with each other.

[LX,LY]=ihLz;[Ly,Lz]=ihLx;[Lz,Lx]=ihLy.......4.99[SX,SY]=ihSz;[Sy,Sz]=ihSx;[Sz,Sx]=ihSy........4.134

Prove Kramers' relation:

sn2rs-(2s+1)ars-1+s4[(2l+1)2-s2]a2rs-2=0

Which relates the expectation values of rto three different powers (s,s-1,ands-2),for an electron in the state ψn/mof hydrogen. Hint: Rewrite the radial equation (Equation) in the form

u''=[l(l+1)r2-2ar+1n2a2]u

And use it to expressrole="math" localid="1658192415441" (ursu'')drin terms of (rs),(rs-1)and(rs-2). Then use integration by parts to reduce the second derivative. Show that (ursu'')dr=-(s/2)(rs-1)and(u'rsu')dr=-[2/s+1](u''rs+1u')dr. Take it from there.

Question: In Problem 4.43you calculated the expectation value ofrsin the stateψ321. Check your answer for the special cases s = 0(trivial), s = -1(Equation 6.55), s = -2(Equation 6.56), and s = -3(Equation 6.64). Comment on the case s = -7.

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