Lecture 2 - Lecture 2Atomic Structure Atomic structure:...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 2—Atomic Structure Atomic structure: Rutherford: atoms are mostly empty space (from alpha particle scattering experiments). The occupied space is positively charged. The negative charge is somehow distributed in the empty space. Bohr: the negative charges (electrons) are held by electrostatic forces in orbits around the positive nuclei by a q 1 q 2 /r 2 force. Spectroscopy: matter can absorb energy and then give it back as light, but only of certain specific wavelengths. This is the first evidence that atom energies are quantized . The energies are related to wavelengths λ and frequencies υ as E = hc/λ = hυ where h is Planck’s constant and c is the speed of light (other evidence: atoms have specific ionization energies). A related equation is λ = h/mv = h/momentum. Note that this makes the values of r quantized also. Quantum mechanics We can’t confine the electrons specifically to orbits or to any fixed positions (Heisenberg uncertainty principle: we can’t know both position and momentum
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/29/2009 for the course ME 530.230 taught by Professor Katz during the Spring '09 term at Johns Hopkins.

Page1 / 2

Lecture 2 - Lecture 2Atomic Structure Atomic structure:...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online