Spectroscopy

SPECTROSCOPY
NGUYEN TIEN LONG
Hanoi university of science
outline
Defination
Theory
Classification
Application
DEFINATION
Spectroscopy
+ The study of the interaction between matter and radiated energy
+ Interation with ratiative energy as function of its wavelength or frequency
Spectrum
+ a plot of the response of interest as a function of wavelength or frequency
defination
Spectrometry & Spectrography
+ spectrometers
+spectrophotometers
+spectrographs
+spectral analyzers
Thoery
* atoms and molecules have unique spectra.
* resonance – resonance frequency
+ A plot of amplitude vs. excitation frequency will have a peak centered at the resonance frequency
* In quantum mechanical systems, the analogous resonance is a coupling of two quantum mechanical stationary states of one system.

Classification
Types of studied radiative energy
Nature of the interaction
Types of material
Types of studied radiative energy
+ Electromagnetic radiation
+ Particles, due to their de Broglie wavelength
+ Acoustic spectroscopy
Nature of the interaction
Absorption
Emission
Impedance spectroscopy
Inelastic scattering
Type of material

* Atoms
Molecules
Nuclei
Crystals and extended materials


Application
physical and analytical chemistry
astronomy and remote sensing




* Daily observations of color can be related to spectroscopy

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