C566lecture4_000

C566lecture4_000 - C566 Master Lecture Notes Lecture 4...

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C566 Master Lecture Notes Lecture 4 Mechanical versus Electrical Anharmonicity Mechanical : Deviation from harmonic oscillator model comes from non-harmonic potential energy function. Higher order terms in the V(R) result in non-symmetric wavefunctions which results in non-zero transition intensity for  1 transitions, along with G( ) Electrical : Higher-order terms in the expression for (R) give intensity to  1 transitions, but do not affect G( ). This overall effect is small relative to the mechanical effect. Combination Differences- Extracting spectroscopic constants from spectra To determine: e e x e e y e Method of Second Differences used to get e and e x e (from Herzberg Diatomics) HCl peak positions  (  = 0) obs G 2 G 0 0 2885 1 2885 2782 -103.7 2 5668 2679 -103.2 3 8347 2576 -102.8 4 10923 G = e 2 e x e ( + 1) = e 2 e x e 2 e x e ( ) 2 G
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C566lecture4_000 - C566 Master Lecture Notes Lecture 4...

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