Intro Spectroscopy
5th Edition
ISBN: 9781305221796
Author: PAVIA
Publisher: Cengage
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At 293 K, the Bragg angle for X-ray peak (111) from a powdered gold metal specimen is 38.30o. If the same peak is detected at 493 K, calculate the angle. Assume gold metal has a coefficient of linear thermal expansion of 14.2 x10-6 K-1 and a length of 0.47 nm for its standard FCC unit cell.
X ray diffraction in Potassium Chloride (KCl) results in a first order maximum when 97 pm wavelength X rays graze the crystal plane at 8.5 degrees. Find the spacing between crystal plane?
When x - rays of wavelength of 0.129 nm are incident on the surface of a crystal having a structure similar to that of NaCl, a first - order maximum is observed at 8.15°. Calculate the interplanar spacing of the crystal based on this information.
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- Potassium iodide (Kl) has the same crystalline structure as NaCI, with atomic planes separated by 0.353 nm. A monochromatic x-ray beam slums a first-order diffraction maximum when the grazing angle 7.60. Calculate the x-ray wavelength.arrow_forwardWhat is the momentum of a 589-nm yellow photon?arrow_forwardQ. 1. An X-ray beam of wavelength 0.71 A is diffracted by a cubic KCL crystal of density 1.99x10^3 Kgm-3. Calculate the interplanner spacing for (200) planes and glancing angle for the second order reflection from these planes. The molecular weight of KCL is 74.6 amu and the Avagadro’s numberis 6.023x10^26 Kg-1 mole-1.arrow_forward
- A CdTe planar wafer has an absorption coefficient of 3.2 × 10^4??−1for light ofwavelength 530 nm Determine the minimum thickness the CdTe wafer has to be for 95% of this wavelength to beabsorbed.arrow_forwardFor a coefficient of 1.8 × 10^15 m−1 J^-0.5, at what wavelength is the absorption coefficient equal to 1000 cm-1 for GaAs at 300K.arrow_forwardCalculate the coherence length for CO2 laser whose line width is 10^−5nm at IR emission wavelength of 10.6 μm.arrow_forward
- By what rate a photon emitted from a sodium vapor lamp? Assume that the lamp's light is monochromatic and of wavelength 589 nm? Answer : 1.5*10^20 s^-1arrow_forwardWhat is the diffraction limited resolution of 10 nm X-ray photons?arrow_forwardA CdTe planar wafer has an absorption coefficient of 3.2 × 104??−1for the light of wavelength 530 nm. Determine the minimum thickness the CdTe wafer has to be for 95% of this wavelength to be absorbed.arrow_forward
- X-rays with wavelengths of 128 pm was used to study a crystal which produced a reflection of 15.8 degrees. Assuming first order diffraction (n = 1), what is the distance between the planes of atoms (d)?arrow_forwardThe mean lifetime of the excited state produced by irradiating mercury vapor with a pulse of 263.7 nm radiation is 2.5 x10- 8s. Calculate the approximate value for the width of the fluorescence line produced in this way.arrow_forwardAn APD has a quantum efficiency of 50% at a wavelength of 500 nm in the absence of multiplication. If the device is operated with a reverse bias to give a multiplication factor of 8. Calculate: a. responsivity. b. the photocurrent of the APD if the incident optical power is 4 μW.arrow_forward
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