Chapter 6 – An Introduction to Spectrometric Methods What makes a method Spectrometric? Brief review of Properties of Light Transmission: Diffraction: Coherent radiation: Incoherent radiation:

Interference: Polychromatic interference: Refraction: Reflection: Scattering: Behavior of light waves:

The Photoelectric Effect How Light Interacts with Matter:

Energy States

Atomic: Molecular:

In what ways can the interaction of light with matter be measured? Radiation

Frequency (Hz)

Wavelength

Transition

Non-Chemical Uses

Radio

< 3x1011

nuclear spin flips

Signal Transmission

MW

3x1011-1013

molecular rotations,

electron spin flips

Cooking

IR

1013-1014

molecular vibrations

Heating

VIS

4-7.5x1014

valence electron

Illumination

UV

1015-1017

valence electron

"Black" Lights

X-Ray

1017-1020

inner electron

Imaging

Gamma

1020-1024

nuclear

Cancer treatment

Type

Radiant Power Measured

Concentration Relationship

Method

Emission

Emitted, Pe

Atomic Emission

Luminescence

Luminescent, PL

Atomic and molecular fluorescence, phosphorescence, chemiluminescence

Scattering

Scattered, Psc

Raman scattering, turbidimetry, and nephelometry

Absorption

Incident, Po & transmitted P

Atomic and molecular absorption

Homework: 6th edition, Chapter 6 #2-12, 14-19