SlideServe
Télécharger Obtenir Pro
Menu
Accueil Pro
Préférences
ApparenceLight Aide et commentaires
© SlideServe · v2026

The Shell Model

hu-pace avatar
hu-pace
13 diapositives · 459 Views · Nov 04, 2014

The Shell Model. And Photoelectron Spectroscopy and the Structure of Atoms Ch 7 part 1.5. A little history. Einstein earned the Noble Prize for his work on the Photoelectric effect.

#the shell model #the shell model ppt #powerpoint #presentation
The Shell Model - slide 1
01 / 13The Shell Model
1 / 17

Télécharger la présentation

The Shell Model
Une image / un lien ci-dessous est fourni (tel quel) pour télécharger la présentation

Politique de téléchargement : le contenu du site vous est fourni TEL QUEL pour votre information et votre usage personnel ; il ne peut être vendu, concédé sous licence ni partagé sur d’autres sites sans l’accord de son auteur.Le contenu vous est fourni TEL QUEL, pour votre information et votre usage personnel uniquement. Téléchargez la présentation en cliquant sur ce lien. Lors du téléchargement, si vous ne parvenez pas à télécharger une présentation, l’éditeur a peut-être supprimé le fichier de son serveur.Pendant le téléchargement, si vous ne parvenez pas à obtenir une présentation, le fichier a peut-être été supprimé par l’éditeur.

F I N

Plus de contenu associé

Transcription de la présentation

  1. The Shell Model And Photoelectron Spectroscopy and the Structure of Atoms Ch 7 part 1.5

  2. A little history • Einstein earned the Noble Prize for his work on the Photoelectric effect. • The photoelectric effect is when electrons are emitted from a solid liquid or gas when they absorb energy in the form of light. • This has been determined experimentally by shining light on metal.

  3. Photoelectric EffectBy shining a light on metal, one may create a current

  4. Photoelectric effect • Increasing the intensity of the light increased the number of photoelectrons, but not their maximum kinetic energy • Red light will not cause the ejection of electrons, no matter what the intensity! • A weak violet light will eject only a few electrons, but their maximum kinetic energies are greater than those for intense light of longer wavelengths!

  5. Ephoton = hv

  6. Photoelectron Spectroscopy • PES provides a useful means to extract information on atomic structure using spectroscopic data. • By looking at the data chart one may determine the structure of the atom. • How? The chart gives evidence for the shell model.

  7. Do all electrons in a given shell have the same energy? To answer this a technique using radiation on a neutral atom in the gas phase called Photoelectron Spectroscopy is used. The technique shines radiation (UV or X-ray) on an atom to excite it to the point that it will eject an electron from its shell and form a cation. Photoelectron Spectroscopy (PES)

  8. Shell Model • In the shell model, we see the ionization energy is decreased the farther the electron is from the nucleus. • By the way of reasoning, it takes more energy to remove an electron from n=2 than n=3.

  9. The energy of the photon used is higher than the ionization energy. The excess energy is converted to the kinetic energy on the ejected electron. The energy required to remove the electron is equal to the difference between the energy absorbed by the atom (hv) and the kinetic energy of the ejected electron IE = hv - KE Photoelectron Spectroscopy (PES)

  10. Photoelectron Spectroscopy (PES) • This technique allows the researcher to remove one electron from any shell. • Therefore, One may remove electrons from the inner core without moving the outer electrons.

  11. The apparatus

  12. Reading a PES spectra • On the PES spectra, energy increases as one moves to the left. The height refers to the number of electrons.

  13. Demostration • http://www.chem.arizona.edu/chemt/Flash/photoelectron.html