L19 - Paul Adrien Maurice Dirac(19021984 The underlying...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
    The  underlying   physical   laws  necessary for the mathematical theory of a large part of  physics and the  whole   of   chemistry  are thus  completely   known , and the difficulty is only  that the exact application of these laws leads to equations much too complicated to be  soluble. It therefore becomes desirable that approximate practical methods of applying  quantum mechanics should be developed, which can lead to an explanation of the main  features of complex atomic systems without too much computation.  Proceedings of the Royal Society of London. Series A, Containing Papers of a  Mathematical and Physical Character, Vol. 123, No. 792 (Apr. 6, 1929) Paul Adrien Maurice Dirac (1902-1984) BTW: computational chemists are still developing these ``approximate practical methods’’;  Kohn and Pople received Nobel Prize in Chemistry in 1998 for two such methods.
Background image of page 1

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

View Full DocumentRight Arrow Icon
  The Central Themes of VB Theory A covalent bond forms when the orbitals of two atoms overlap and the  overlap region, which is between the nuclei, is occupied by a pair of  electrons. A molecule is viewed as a collection of atoms connected by covalent bonds. Bonds are described in terms of orbitals associated with  individual nuclei (localized on individual nuclei). The Central Themes of MO Theory A molecule is viewed as a collection of nuclei surrounded by delocalized  molecular orbitals  (orbitals that extend over the entire molecule). Atomic wave functions are summed to obtain molecular wave functions.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/20/2008 for the course CHEM 111 taught by Professor Grzegorz during the Spring '08 term at Colorado State.

Page1 / 18

L19 - Paul Adrien Maurice Dirac(19021984 The underlying...

This preview shows document pages 1 - 3. Sign up to view the full document.

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