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- What percent transmittance range and what absorbance range are considered to be the optimum working ranges for spectrochemical measurements?Peaks of scattered intensity are observed when the path difference would becomes equal to __________ λ/2 λ 2λ 3λ/2State the difference between transmittance, absorbance, and molar absorptivity. Which one is proportional to concentration?
- Write a short note about IR spectroscopy instrumentation (source)? Please answer at your own words(to the pount).An absorption measurement with a 1 cm path length yields a reading of 0.004 absorbance units with a noise of 0.001 absorbance units and a mean noise reading of 0 for 10 scans averaged together. Assuming the noise for a single scan does not change if the path length is increased to 6 cm and the number of scans is increase to 100, what is the signal to noise of the new measurement.Explain why the information from an XPS chemical shift must also be contained in an X-ray absorption edge.
- Why do you have to use the same cuvette after doing the baseline correction in Ultraviolet-Visible Spectrophotometry? (Minimum of 8 sentences)A Raman spectrum of undoped GaAs at room temperature is performed with a 514.5 nm laser. The spectrum of scattered light exhibits peaks at wavelengths of 507.1 nm and 591.6 nm due to interaction of the incident light with LO phonons. Calculate the LO phonon frequency and the ratio of the intensity of scattered light at 507.1 nm to that at 591.6 nm.Draw and label a schematic of an ICP-OES spectrophotometer. Briefly (point form is acceptable) explain the purpose or function of each component
- the transmittance concentration pairs could have been used to determine a calibration curve. state at least one important problem associated with such a calibration curveThe following are the reasons why instrumental analysis methods are used, except for: a. Narrow concentration ranges may be detected. b. Extreme low sensitivity, with molecule and noise signal detection. c. Separate equipment or facilities for control, data handling, and optimization procedures. d. All of the aboveCalculate % transmittance if 85% of light was absorbed by an analyte sample in an UV-Vis spetrophotometric experiment