The yellow line of sodium is at 589.3 nm is actually a doublet of 0.590-nm peak
ID: 485522 • Letter: T
Question
The yellow line of sodium is at 589.3 nm is actually a doublet of 0.590-nm peak separation. What is the minimum number of lines that a grating must have to resolve this doublet in the first orders? What must be the spectral bandwidth to achieve base line resolution? What slit width is necessary if the monochromator has a reciprocal liner dispersion of 1.6 nm/mm the first order? What is Stokes Shift? At what conditions can a Stokes shift occur in atomic spectroscopy? A high pressure xenon arc lamp produces a broad band spectrum from 200-1000 nm. Explain. Light of 300 nm is diffracted from a grating in the first order at an angle of incidence normal to the grating. If the grating contains 1180 grooves/mm. Calculate the angle of diffraction for this wavelength. Why are multichannel detectors appropriate for atomic emission measurements? Explain Stimulated emission of light? Why is important in operation of LASER?Explanation / Answer
Q.(5): Since Xenon exist in atomic form, we should expect line spectrum from a high pressure xenon arc lamp. However this doesn't happen in reality. Because at high pressure multiple collision of xenon atoms takes place that results different energies of ground state. This produces different emission wavelengths resulting a contineous broadband spectrum from 200-1000 nm.
Q.(6):
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