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The Born-Oppenheimer Separation

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1 The Born-Oppenheimer Separation
Harry Kroto 2004

2 The Born-Oppenheimer Separation
H = Hel + Hvib + Hrot+ … Harry Kroto 2004

3 The Born-Oppenheimer Separation
H = Hel + Hvib + Hrot+ …  = el vib rot …  = i i Harry Kroto 2004

4 The Born-Oppenheimer Separation
H = Hel + Hvib + Hrot+ …  = el vib rot …  = i i E = Eel + Evib + Erot +… E= i Ei Harry Kroto 2004

5 The Born-Oppenheimer Separation H = E H = Hel + Hvib + Hrot+ …
 = el vib rot …  = i i E = Eel + Evib + Erot +… E= i Ei We shall often use Dirac notation m  m and m*  n  Harry Kroto 2004

6 Time independent Hoo = Eoo Harry Kroto 2004

7 Time independent Hoo = Eoo Stationary States mo  m
Harry Kroto 2004

8 Time independent Hoo = Eoo Stationary States mo  m m  o
Harry Kroto 2004

9 Need to solve the Time Dependent Problem
D Selection Rules Need to solve the Time Dependent Problem Harry Kroto 2004

10 Time dependent Time independent [Ho + V(t)] = iħ/t Hoo = Eoo
Stationary States mo  m m  o Harry Kroto 2004 Harry Kroto 2004

11 Time dependent Time independent [Ho + V(t)] = iħ/t Hoo = Eoo
V(t) = -Ee(t) e Time independent Hoo = Eoo Stationary States mo  m m  o Harry Kroto 2004 Harry Kroto 2004

12 Time dependent Time independent [Ho + V(t)] = iħ/t Hoo = Eoo
V(t) = -Ee(t) e Ee (t) = Eeocos 2t Time independent Hoo = Eoo Stationary States mo  m m  o Harry Kroto 2004 Harry Kroto 2004

13 Time dependent Time independent [Ho + V(t)] = iħ/t Hoo = Eoo
V(t) = -Ee(t) e Ee (t) = Eeocos 2t Ee(t) Radiation field Time independent Hoo = Eoo Stationary States mo  m m  o Harry Kroto 2004 Harry Kroto 2004

14 e Electric dipole moment Time independent Hoo = Eoo
Time dependent [Ho + V(t)] = iħ/t V(t) = -Ee(t) e Ee (t) = Eeocos 2t Ee(t) Radiation field e Electric dipole moment Time independent Hoo = Eoo Stationary States mo  m m  o Harry Kroto 2004 Harry Kroto 2004

15 e Electric dipole moment  = mam(t) m Time independent Hoo = Eoo
Time dependent [Ho + V(t)] = iħ/t V(t) = -Ee(t) e Ee (t) = Eeocos 2t Ee(t) Radiation field e Electric dipole moment  = mam(t) m Time independent Hoo = Eoo Stationary States mo  m m  o Harry Kroto 2004 Harry Kroto 2004

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