B5 Atomic Spec

In atomic emission specstroscopy the flame acts as

• Excitation and nebulisation

• Excitation and ionization

• Nebulisation and vaporization

• Ionization and vaporization

Which gasses are used in GF-AAS technique?

• Helium, Nitrogen

• Nitrogen, Argon, Hydrogen

• Acetylene, Air

• Hydro, Oxygen

Which spectroscopic method measures the absorption?

• AES

• Molecular Fluorescence Spectrocopy

• AFS

• AAS

Electrodeless discharge lamp (EDL) used for detection of Sb metal contains ... ?

• Volatile compounds of Sb

• Cathode made by Sb metal

• Anode made by Sb metal

• Cathode made by oxide of Sb

What is full name of AAS?

• Atomic Emission Spectroscopy

• Molecular Absorption Spectroscopy

• Atomic Absorption Spectroscopy

• Atomic Adsorption Spectroscopy

In some type of analysis, nitrogen is allowed to flow over the flame

• To control temperature

• To prevent turbulence

• To remove water in the flame

• To exclude atmospheric oxygen

Atomic Emission Spectroscopy is

• The measurement of intensity of emitted light at a particular wavelength from the atoms that are excited thermally

• The measurement of absorbance of emitted light at a particular wavelength from the atoms that are excited thermally

• The measure of intensity of emitted light at a particular wavelength from the atoms that are excited by monochromatic light

• The measurement of intensity of absorbed light at a particular wavelength from the atoms that are excited thermally

What could be the light source for Atomic Absorption Spectroscopy?

• LED

• Deuterium lamp

• Hollow Cathode lamp

• Tungsten halogen lamp

• Electrodeless Discharge lamp

In AAS using graphite furnace, excited source

• use thermal energy of flame to immediately burn graphite cuvette containing the sample

• use thermal energy of high voltage electricity to immediately burn graphite cuvette containing the sample

• use thermal energy of plasma to immediately burn graphite cuvette containing the sample

• use thermal energy of alternating magnetic field to immediately burn graphite cuvette containing the sample

Signal of measurements in Atomic Emission Spectroscopy is?

• Intensity of absorbed light

• Ratio of intensity of transmitted light / intensity of excited light

• Intensity of refracted light

• Intensity of emitted light