Measuring Orbital Energies

Slides:



Advertisements
Similar presentations
Chapter Ionic Bonding 6.2 Covalent Bonding
Advertisements

PES photoelectron spectroscopy. How does PES work? PES works on the same principle as the photoelectric effect.
The Shell Model And Photoelectron Spectroscopy and the Structure of Atoms Ch 7 part 1.5.
1/8/09 Warm Up: The observed regularities in the properties of the elements are periodic functions of their Atomic numbers Mass numbers Oxidation states.
Spectroscopy The Light Spectrum. Vibrational Spectroscopy D(t) r(t) Band structure The higher the BO: i) the deeper the Well, ii) the wider the spacing.
Ultraviolet (UV) region 4 x m to m Region of greatest interest to organic chemists from 2 x m to 4 x meters 10.9 Ultraviolet Spectroscopy.
CHEMISTRY 2000 Topic #1: Bonding – What Holds Atoms Together? Spring 2010 Dr. Susan Lait.
Academic Chemistry Class Notes April 9, 2015 Periodic Trends of the Elements.
Periodic Table Trends & Definitions. How to read the Periodic Table 6 C Carbon Atomic Number Elemental Symbol Elemental Name Atomic Mass.
Periodic Trends. Nuclear Charge Shielding Atomic Radius.
I.Absorbing Species Absorption of light is a two step process: AbsorptionM + h   M* Relaxation M*  M + heat The heat evolved (very minute) does not.
Chapter 2 The Chemical Context of Life. Comment u Much of this chapter should be review from your chemistry class. The material should not be brand new.
Molecular Orbitals Chapter 9. Molecular Orbital model This model examines unpaired electrons, bond energies and excited state electrons. Examine the H.
Spectroscopic Analysis of Molybdenum Model Compounds by: 1.Infrared 2. 1 H NMR 3.Electronic (UV/vis) 4.ESI-MS Why? What did I make? How do molecules differ?
 Size is expressed in terms of atomic radius.  Atomic radius is ½ the distance between the nuclei of two atoms of the same element when the atoms are.
Testing a Mechanism: Reaction Kinetics Case I. Testing a Mechanism: Reaction Kinetics Case II.
Lecture 10. Chemical Bonding. H 2 Molecule References Engel, Ch. 12 Ratner & Schatz, Ch. 10 Molecular Quantum Mechanics, Atkins & Friedman (4th ed. 2005),
Hybridization of Orbitals
Periodic Relationships Among the Elements Chapter 8.
Chapter 2: Atoms and Molecules of Ancient Earth Life requires about 25 elements carbon (C) oxygen (O) hydrogen (H) nitrogen (N)
The distribution of electrons of an atom or molecule (or other physical structure) in atomic or molecular orbitals an energy is associated with each electron.
Periodic Properties of the Elements Chapter 7. Effective Nuclear Charge Orbitals of the same energy are said to be degenerate. Effective nuclear charge.
Atomic Structure The theories of atomic and molecular structure depend on quantum mechanics to describe atoms and molecules in mathematical terms.
IONS. Neutral Atoms: Review Neutral Atoms have the same number of PROTONS and ELECTRONS. Protons have a POSITIVE charge. + Electrons have a NEGATIVE charge.
UV/vis Spectroscopy = Electronic Spectroscopy What does it monitor / probe? What information about molecule can one obtain?
Itaru KURUSU, Reona YAGI, Yasutoshi KASAHARA, Haruki ISHIKAWA Department of Chemistry, School of Science, Kitasato University ULTRAVIOLET AND INFRARED.
Molecular Orbitals Chapter 9. Molecular Orbital model This model examines unpaired electrons, bond energies and excited state electrons. Examine the H.
Molecular Orbital Theory 1.MO theory suggests that atomic orbitals of different atoms combine to create MOLECULAR ORBITALS 2. Electrons in these MOLECULAR.
INORGANIC CHEMISTRY CHEMISTRY 340. MAIN THEMES OF INORGANIC CHEMISTRY Periodic Properties and Periodic Trends Point Groups and Symmetry The 18 electron.
Atomic Trends: Atomic Size n = 1 n = 2 n = 3 n = 4 n = 5 n = 6 n = 7 Increasing “n” Larger orbitals Small Large n is constant... Additional electrons.
Chemical Bonding And Molecular Geometry. What is a chemical bond? - mutual electrical attraction between the nuclei and valence electrons of different.
Periodic Properties Chapter 12 Notes. Valence Electrons Valence electrons – Electrons in the outer energy level that can be lost, gained, or shared (connected.
ENERGY & THE 1 st LAW OF THERMO. 1 st Law : concerning quantity of energy Energy is conserved (Amount of energy is constant, but can change forms) (e.g.
photoelectron spectroscopy
Review of Basic Chemistry
Electron Configuration and Periodic Properties
MOLECULAR ORBITAL THEORY
Spectroscopy.
Periodic Properties.
UV-VIS Spectroscopy By Dr.Jagadeesh.
Periodic Table Trends.
Sections 7.4 – 7.5 Periodic Properties of Atoms and Ions
Interaction of p orbitals in polyenes at the Huckel level of theory
What is Radiation? Energy emitted from a source is generally referred to as radiation. Can be either wave or particles… EM Wave radiation.
Terms to know Binary Valence electrons Ion Cation Anion Polyatomic ion
Sections 7.4 – 7.5 Periodic Properties of Atoms and Ions
Atomic Radii Trends 1. atomic radii Increase as move down  a group (or family)
The Chemical Context of Life
Periodic Trends (2.9).
Photoelectron Spectroscopy AKA Photoemission Spectroscopy
Periodic Trends.
Periodic Trends (2.9).
PROBING THE MOLECULAR DYNAMICS OF A Cu(CD3OD) CLUSTER WITH
Figure 7.2 Effective nuclear charge.
Chapter 2 The Chemical Context of Life
The structure of matter: Electron configurations
Practice questions Describe the results in Rutherford´s experiment.
Section 3 Trends and the Periodic Table
Lecture 8A - Formation of Covalent (Molecular) Compounds
QQ: Complete the Boxes:
Molecular Orbitals Two interacting orbitals make two new orbitals. Using a 1s orbital on two H atoms: anitbonding orbital = higher energy bonding orbital.
Molecular Orbitals Two interacting orbitals make two new orbitals. Using a 1s orbital on two H atoms: anitbonding orbital = higher energy bonding orbital.
Periodic Trends.
Stored energy due to position
Periodic Trends Ag Chemistry Mrs. Fahey.
Unit 1 – Atomic Structure
Periodic Trends Continued
Periodic Trends.
Spectroscopy for AP Chemistry
Spectroscopy for AP Chemistry
Presentation transcript:

Measuring Orbital Energies KE hv Vacuum level e- + e- e- e- + Molecular orbital energy levels e- e- +

Measuring Orbital Energies KE hv Vacuum level e- + e- e- e- + Molecular orbital energy levels e- e- +

Measuring Orbital Energies KE hv Vacuum level e- + e- e- e- + Molecular orbital energy levels e- e- +

Measuring Orbital Energies ← Ionization Energy + e-

7.5 Ion State 7.0 6.5 Neutral Molecule

Reorganization Energy + Distortion Coordinate Energy B A C Er+ Mo M+ + B C Cation Oxo-Mo-O angle 97.6o Neutral Oxo-Mo-O angle 101.9o A

UV-Visible Spectroscopy

Electron Transfer The activation energy, DE, is influenced by the reorganization energy of the system. The system can be examined as two entities: The reactants and the solvent. Solvent reorganization energy can have a large influence on the reorganization energy of the system R P Potential Energy Nuclear Configuration