Question

3. Below is a laser beam, please use two mirrors in space to guide the light throu center of the holes and describe how you would adjust the mirror to ensure the beam pass the two pin holes. Pin hole 2 Pin hole 1 A tooth sample have a strong Raman signal at 960 cm1 If use a green light (532 nm) Raman system, where would you expect the signal to appear (in nm)? What if the excitation laser is 755 nm? 4.

Answer 1

Stokes and anti - stokes are Roman lines Excitation line is at wave number of incident photon. Lambda_0 = 532 nm gamma_0 = 1/lambda = 10^7/532 = 18796 cm^- 1 lambda_AS - 1/lambda_0 = 1/lambda_0 - 1/lambda_s = Delta gamma Here Delta gamma = 18796 - 960 = 17836 cm^- 1 960 cm^- 1 will be 1/960 cm or 10^7/960 nm almostequalto 10416 nm for lambda_0 = 785 nm gamma_0 = 12738 cm^- 1 Delta gamma = 12738 - 960 = 11778 cm^- 1

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