FDS: spectroscopy GFAAS Flashcards by Thomas Hasiweder

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OUTLINE

Suppose the question is :

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OUTLINE

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Some key aspects:

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Spectra of atoms and molecules

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Quantum principles and spectroscopy

poly electron atom

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Absorption spectrum for Sodium (Na) (vapor)

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Quantum principles and spectroscopy

delta E?

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Graphite Furnace Atomic Absorption Spectroscopy

For AAS

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Get atoms, light and correction

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Over the years large improvements in GFAAS

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Stabilized Temperature Platform Furnace (STPF):

Fast instrument electronics

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Signal integration

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Accurate background correction

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Rapid Furnace Heating

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L’vov platform and Pyrolytic Graphite Tubes

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Gas Stop

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Matrix Modification

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Graphite furnace : atomization process

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Graphite furnace : atomization process

apparatus with sample

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Graphite furnace : atomization process

light beam

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Graphite furnace : atomization process

4 steps

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Graphite furnace : atomization process

matrix modifiers

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Graphite furnace : atomization process

pyrolysis temperature

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Graphite furnace : atomization process

atomization temperature

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Graphite furnace : atomization process

atomization peaks

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Lamps

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Hollow Cathode Lamps

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Electrodeless Discharge Lamps

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Wavelength

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Slit Setting

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Electronics

general

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Electronics

high resolution

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Integrated versus Peak Absorbance

sd

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Integrated versus Peak Absorbance

calibration curve

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Integrated versus Peak Absorbance

additional advantages

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Background Correction

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Background Correction

most simple case

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Background Correction

the pi component

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Background Correction Zeeman-effect:

Two methods for background correction

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Background Correction Transverse arrangement

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Background Correction

Longitudinal arrangement

general

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Background Correction

Longitudinal arrangement

e.g.

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Background Correction Longitudinal arrangement When ON:

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Background Correction

on vs off

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Background Correction Continuum source background correction

general

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Background Correction Continuum source background correction

diagram

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Examples of anomalous Zeeman Splitting

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Furnace Design

HGA

THGA

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Furnace Design

heated by?

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Furnace Design

optical sensor

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Furnace Design L’Vov platform:

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Furnace Design: THGA

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Automated Sampling

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Automated Sampling

tip alignment

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Detection of the emitted light

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the emitted light

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Gases

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In order to improve furnace analytics:

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In order to improve furnace analytics: - Rollover effects

general

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In order to improve furnace analytics: - Rollover effects The resulting Zeeman-effect

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In order to improve furnace analytics: - Rollover effects The effect is depending on?

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In order to improve furnace analytics: - Linearity

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In order to improve furnace analytics: - Interferences spectral interferences

general

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In order to improve furnace analytics: - Interferences spectral interferences

diagram

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In order to improve furnace analytics: - Interferences nonspectral interferences

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In order to improve furnace analytics: - Contamination

labware

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In order to improve furnace analytics: - Contamination

pipets

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Q

ATOMIZATION PROGRAMS ARE ELEMENT SPECIFIC

A