calculate the theoretical reciprocal linear dispersion of an echelle grating with a focal growth of 0.85m, a groove density of 120 grooves/mm, and a diffracion angle of 61 16 when the diffraction order is 30 and 90

You are given the following data  : Peak order (n)                                                  Diffraction Angle (2q) 1                                                                        38.6 2                                                                        55.7 3                                                                        70.0  Determine whether sample is fcc or bcc or neither. Give  reason for your choice.

I) Diamond crystallises in a face-centred cubic structure with a = 3.5625 Å. Calculate the d-spacing and peak position of the first allowed peak (i.e. the peak with the lowest hkl value that meets the selection rules) using a wavelength of 0.71073 Å.  II) A solvothermal synthesis gave rise to a mixture of two crystalline phases: one phase consists of 50-65 μm octahedral crystallites while the other phase consists of 150-180 μm hexagonal plates. Identify a separation technique that would likely be effective in separating these materials.

Calculate the concentration of a colored solution if the molar absorptivity is 39.80 M-1•cm-1 and the absorbance is 0.777. The path length of the sample is 1.00 cm.

1. A compound has a molar absorptivity of 3.031 x 10° L cm1 mol1. If a 15.00 mm-length cell is used to hold the sample, and a transmittance of 19.53 % is measured, what is the molarity of the compound in solution?

In an x-ray diffraction measurement of BCC Nb, the observed angle (2Θ) for the (211) set of planes occurs at 75.90 degrees (1st order) and a monochromatic x-ray source at λ = 0.1659 nm is used. Compute:a) the interplanar spacing of the (211) set of planes,b) the atomic radius of Nb,c) the anticipated 1st order observed angle (2Θ) for the (111) lattice planes in Nb.d) Estimate the relative intensities observed for the (211) and the (111) diffraction peaks in Nb. Describe your reasoning.

10. Determine the interplanar spacings for the following compound: (use λ = 1.54 Å and n=1, calculate spacing for each peak) Intensity (relative) 40 50 60 70 Diffraction angle 20 80 t 90 FIGURE 3.25 Diffraction pattern for polycrystalline copper.

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White light is directed to a reflection grating at an incident angle of 45 degrees. How many grooves per mm should the grating have to diffract first order 666 nm light at an angle of -10 degrees. Round your answer to the nearest 1 groove/mm.

Which of the following is NOT a detector used with HPLC? evaporative light-scattering detector refractive index detector ultraviolet detector electrochemical detector thermal conductivity detector