Atomic Spectroscopy

1. What is the key principle of Atomic Fluorescence Spectroscopy (AFS)?

• Excitation of atoms through radiation

• Excitation of atoms by collisional energy

• Emission of light by excited atoms

• Absorption of light by atoms

In AFS, what does the measurement involve detecting?

• The intensity of the excitation light

• The relaxation back radiation emitted by atoms

• The absorption of photons by the sample

• The fluorescence of the sample

Why is AFS known for its high sensitivity?

• Because it primarily relies on radiation for excitation

• Because it has a low background signal

• Because it is less complex than AAS

• Because it uses collisional energy for excitation

What discouraged further development of AFS in the past?

• Its low sensitivity

• The high cost and operational complexity

• Its limited detection range

• Lack of interest from the scientific community

What does AAS measure in order to determine the concentration of elements in a sample?

• Absorption of emitted light

• Emission of light by excited atoms

• Absorption of specific wavelengths of light

• Fluorescence of the sample

What type of radiation is absorbed by analyte atoms in AAS?

• Ultraviolet

• Infrared

• Microwave

• Visible

In AES, what is the role of the monochromator?

• To disperse emitted light into its component wavelengths

• To generate the sample vapor

• To measure the absorbance of the sample

• To create a plasma source

Which of the following is true about the relationship between absorption and concentration in AAS?

• Absorption is inversely proportional to concentration.

• Absorption is not affected by concentration.

• Absorption is directly proportional to concentration.

• Absorption is only related to the light source.