Raman shifts

Figure Al.6.20. (Left) Level scheme and nomenclature used in (a) single time-delay CARS, (b) Two-time delay CARS ((TD) CARS). The wavepacket is excited by cOp, then transferred back to the ground state by with Raman shift oij. Its evolution is then monitored by tOp (after [44])- (Right) Relevant potential energy surfaces for the iodine molecule. The creation of the wavepacket in the excited state is done by oip. The transfer to the final state is shown by the dashed arrows according to the state one wants to populate (after [44]).

Question. The v = I — 0 interval is 4160 for H2 and 2990 for H2. Estimate the wavelength closest to the exciting radiation from an XeCl laser of stimulated Raman shifted radiation for each of the gases. 

Similarly, the wavenumber of the Raman shifted radiation using H2 is... 

This Raman shifted radiation is obtained using the stimulated Raman effect (Section 9.3.2)... 

Draw a diagram similar to that in Figure 9.21 to illustrate the stimulated Raman effect in FI2. Fligh-pressure FI2 is used to Raman shift radiation from a KrF laser. Calculate the two wavelengths of the shifted radiation which are closest to that of the KrF laser. 

Fig. 4.59. Raman spectrum of methyl mercaptan (a) and SERS spectrum of methyl mercaptide (b) formed by adsorption ofthe mercaptan on a silver surface. The surface reaction is proven by the disappearance ofthe S-H stretching and bending bands at 2575 cm" and 806 cm", respectively. The Raman shift ofthe C-S stretching band at approximately 700 cm" is reduced during adsorption by withdrawal of electron density from the C-S, because of bonding to the silver. The symmetric methyl stretching appears above 2900cm" [4.303].

The number and intensity of the Raman lines and the magnitude of the Raman shift can be related to the identity, structure, and bonding of the molecules of the compound scattering the light. 

The RCA C313034 with a GaAs cathode has a cathode quantum efficiency far better than that of the S-20 type in the red region. This photomultiplier tube allows the study of the 2700-3200 cm-1 Raman shift region with greater sensitivity using the red line (Fig. 8). 

Raman effect (continued) spectral activity, 339-341 terminology of, 295 vibrational wavefunctione, 339-341 Raman lines, 296 weak, 327-330 Raman scattering, 296 classical theory, 297-299 quantum mechanical theory, 296, 297 Raman shift, 296... 

Frequency doubled/Raman shifted fiber laser to generate 589 nm. This is a diode pumped, CW format currently under development. 

Figure 2. The spectra of the amidated pectins (NIR, FT-IR and Raman shift).

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