Glow Discharge Mass Spectrometer has gained popularity among various chemical characterization techniques for the analysis of trace elements in a subject sample because of its high precision.
6. High Voltage b/w Electrodes
The electrodes are
in contact with
Discharge Gas
(Ar) and dV of
250-2000V causes
breakdown of gas
Acceleration of +ve Ions
The +ions
produced
accelerate towards
the Cathode (the
sample)
Cathodic Sputtering
The accelerated
ions transfer their
momentum to
cathode surface
causing its
Sputtering
Sputtering gives rise to
Ionic Species and
Secondary Electrons.
This is called Solid
Sample Atomization
6
8. Spectroscopy is an
Analytical Method
that determines
nature of substance
based on Properties
of light
(Wavelength)
Spectrometry is an
Analytical Method
that determines nature
of substance based on
Properties of Matter
(rate at which ions
move through a
medium)
Spectroscopy & Spectrometry are both studies of Interaction
between Matter and Electro-Magnetic Radiation (EMR)
8
9. MASS SPECTROMETRY
A powerful Analytical Tool that accurately measures the mass of different
molecules within a sample
It measures mass to charge ratio
9
10. WORKING OF MASS SPECTROMETRY
3 stages are involved:
IONIZATION
ACCELERATION
& DEFLECTION
DETECTION
Electron
Impact
Penning
Ionization
10
11. GLOW DISCHARGE MASS SPECTROMETRY
PPB
Detection
Level
High
Sensitivity
Cover
almost
all
elements
Isotopic
Information
Spectral
Simplicity
Measure
small Ion
Population
11
12. GLOW DISCHARGE MASS SPECTROMETER
Emerging Analytical Technique for Characterization of Ion Population
in Glow Discharge Plasmas
Attractive alternative to Optical Spectrometry for Trace Elemental
Analysis
Renders both Qualitative and Quantitative Analysis of Elements
according to their M/Z ratio
Very minimal Matrix Effects rendering Relative Sensitivity Factors
GD Mass Spectra contain Singly Charged Ions
1.
2.
3.
4.
5.
12
