Lecture 5

An Introduction to Spectroscopy

Electromagnetic radiation, electromagnetic wave

Emission, absorption, fluorescence

)2sin(0 tEEphase

frequency

E

Energy (kJ/mol)

Frequency(Hz)

Wavelength (m)

NMRESR

IRRaman

UV-visVacuum UV

X-rayspectroscopy

hE frequency

hc

E wavelength

1

hcE wavenumber

Intensity, Absorbance,Transmittance

Energy, frequency,wavenumber

Wavelength

Spectrum

bands

Lines

Hz

Intensity

4 8 12 16

intensity

Emission

Absorption source sample

Fluorescencesource sample

Secondary emission

Light Source

Sample

Monochromator(filter,

wavelength selector)

Detector

SpectrometerData Processing

Light Source

Sample

Monochromator(filter,

wavelength selector)

Detector

Spectrometer

Data Processing