What are different mechanisms that contribute to the relaxation of nuclear spins in the excited state? Explain any one of them.
When nuclear spins are excited by absorption of radiofrequency energy, they return to thermal equilibrium through several relaxation mechanisms that dissipate the excess energy. The important mechanisms include spin–lattice (longitudinal) _____ _______ __________ _________ __________ __________ ________ ___ _______ ____.
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Which of the following systems will show electron spin resonance (ESR) spectrum? (i) H (ii) (iii)
(iv)
(v)
(vi)
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)
Spin-Spin splitting
In what way is NMR spectrometry different from other molecular spectroscopic methods?
What are different mechanisms that contribute to the relaxation of nuclear spins in the excited state? Explain any one of them.
What is the photoelectric effect? Write the equation of Einstein’s photoelectric law.
Peak X corresponds to F 1s electrons, which have the highest binding energy because fluorine’s high electronegativity and small size give its 1s electrons a large effective nuclear attraction. Peak Y is N 1s and Peak Z is Al 2p.