What is Mossbauer effect?
The Mössbauer effect is the recoil-free, resonant absorption and emission of gamma rays by atomic nuclei bound in a solid. Normally, when a free nucleus emits or absorbs a _____ _______ _______ _________ _________ ______.
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What are different mechanisms that contribute to the relaxation of nuclear spins in the excited state? Explain any one of them.
The lifetime of (excited state) is
. If the excited state is
above the ground state determine the linewidth
and ratio
.
In Raman spectra, the Stokes line are more intense than the anti-Stokes lines. Why?
Which of the following systems will show electron spin resonance (ESR) spectrum? (i) H (ii) (iii)
(iv)
(v)
(vi)
What is the importance of spectroscopy in structure determination?
A light source of wavelength illuminates a metal surface and electron are ejected with the maximum kinetic energy 2 eV. If the same surface is illuminated by a light source of wavelength
, then calculate the maximum kinetic energy of the ejected electron. (Work function of metal is 1 eV)
What is meant by anisotropy of chemical bond? Give an example.