optical
optical optical
graph is provided in Fig. 8. Fig. 7. Schematic of the absorbance setup Fig. 8. A photograph of the absorbance setup The CUV-UV Holder for 1-cm Cuvettes couples to lamps and spectrometers to create an absorbance or transmission measurement system. Two 74-UV lenses are mounted across the cell holder for square 1-cm cuvettes. The base includes channels for connection to a water bath for temperature regulation, and the unit also accepts filters. The 74-UV lens uses fused 10
silica for a wavelength range of 200 to 2000 nm. When focused for collimation, the beam divergence is 2 degrees or less, depending on the optical fiber diameter. 1. Set up the experiment according to the schematic in Fig. 7. The light source here is the same tungsten filament used for the blackbody radiation experiment. 2. Align the optics so that sufficient light goes into the fiber. 3. Prepare ICG and HITC-BF4 solutions with various concentrations. You may find that low concentrations (less than 10 −3 M) are preferable for this experiment. A CVD-UV Disposable Cuvette should be filled with a sample. 4. Put the cuvette with a solution in the CUV-UV Holder and collect the spectra for both sample spectral density ε e ′ (λ) (with the solution that you want to measure) and blank spectral density ε e (λ) (with only solvent as a reference). 5. Determine the optical absorbance OA by Eq. 5. 6. Repeat steps 4 and 5 for each of the various concentrations. 7. Using Eq. 6, determine the molar absorptivity of your sample. In your lab report, you should comment on the optical properties of the various components (the cuvette, the cuvette holder and its lenses, etc.) used in the measurement, and how they might affect the performance of the apparatus. Photoluminescence An illustration of the setup for the photoluminescence (PL) experiment is shown in Fig. 9, and a photograph is provided in Fig. 10. Fig. 9. Schematic of the photoluminescence setup 11
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silica for a wavelength range of 200 to 2000 nm. When focused for collimation, the beam<br />
divergence is 2 degrees or less, depending on the <strong>optical</strong> fiber diameter.<br />
1. Set up the experiment according to the schematic in Fig. 7. The light source here is<br />
the same tungsten filament used for the blackbody radiation experiment.<br />
2. Align the optics so that sufficient light goes into the fiber.<br />
3. Prepare ICG and HITC-BF4 solutions with various concentrations. You may find that<br />
low concentrations (less than 10 −3 M) are preferable for this experiment. A CVD-UV<br />
Disposable Cuvette should be filled with a sample.<br />
4. Put the cuvette with a solution in the CUV-UV Holder and collect the spectra for both<br />
sample spectral density ε e ′ (λ) (with the solution that you want to measure) and blank<br />
spectral density ε e (λ) (with only solvent as a reference).<br />
5. Determine the <strong>optical</strong> absorbance OA by Eq. 5.<br />
6. Repeat steps 4 and 5 for each of the various concentrations.<br />
7. Using Eq. 6, determine the molar absorptivity of your sample.<br />
In your lab report, you should comment on the <strong>optical</strong> properties of the various components<br />
(the cuvette, the cuvette holder and its lenses, etc.) used in the measurement, and how they<br />
might affect the performance of the apparatus.<br />
Photoluminescence<br />
An illustration of the setup for the photoluminescence (PL) experiment is shown in Fig. 9,<br />
and a photograph is provided in Fig. 10.<br />
Fig. 9. Schematic of the photoluminescence setup<br />
11
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