Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074



Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

Sketch the major features (number of peaks and relative intensities for the peaks) of the expected photoelectron spectrum for atoms of nitrogen.

Interpretation Introduction


The expected photoelectron spectrum of nitrogen atom has to be sketched and explained.

Concept Introduction:

Photoelectron spectroscopy: This is to energy measurement of electrons emitted from solids, gases or liquids by the photoelectric effect, in order to determine the binding energies of electrons in a substance.   

The key to understanding PES is that all of the ejected electrons results from bombarding the atom with photons of the same energy (hv). The energy goes into ejecting the electrons from the atom corresponding to the ionization energy (IE) of the electron with the remainder going into kinetic energy of the electron. The formula of photoelectron spectroscopy hv= IE + KE (electron)

Screening effect: The screening effect can be defined as a reduction in the effective nuclear charge on the electron cloud, due to a difference in the attraction forces on the electrons in the atom. It is also referred to as the screening effect (or) atomic shielding.


Let us consider the orbital filling method of Nitrogen atom (N)

  AtomicnumberofNitrogen(N)= 7spdfwith orbtital notation=[1s22s22p3]Orbital filling method       Ȁ

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