Electronic transitions are called vertical transitions. Comment.
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A photoelectron spectrum of a compound containing nitrogen (N), aluminium (Al), and fluorine (F) shows three strong peaks at the following binding energies:
Peak X: ~686 eV
Peak Y: ~399 eV
Peak Z: ~73 eV
Find the best option from the choices given below that best explains the relative positioning of these peaks in terms of binding energy.
(i) 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.
(ii) Nitrogen has more valence electrons than fluorine or aluminium, therefore its peak appears at the highest binding energy.
(iii) The spectrum shows more aluminium atoms than nitrogen or fluorine, so its peak appears at the lowest binding energy due to dilution.
(iv) Aluminium has the highest nuclear charge, so its 2p peak should have the largest binding energy, but shielding effects reverse this trend.
Justify your answer.
What is the photoelectric effect? Write the equation of Einstein’s photoelectric law.
What is Mossbauer effect?
Raman rotational spectra of was observed with Hg light with Rayleigh line at
. Stokes lines were observed at
. Draw the rotational energy level diagram with Stokes and anti Stokes lines.
has bond length
. Calculate the wavenumbers of the first four lines in its microwave spectrum.
[Given: mass of C=12.000 u and mass of N=14.007 u]
Calculate the ESR frequency of an unpaired electron in a magnetic field of 3000 G (0.3 T).
[Given: ;
; and
]
In what way is NMR spectrometry different from other molecular spectroscopic methods?