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# CH6061 Atomic Emission Spectroscopy

6 Pages / 1,345 Words Published On: 03-04-2021
Question:

Describe the physical process occurring in each of the following processes;

i) Atomic Absorption,

ii) Atomic Emission,

iii) Atomic Fluorescence.

2.The statistical weight of a level can be calculated by multiplying the subscript by 2 and adding 1 e.g. 2P1/2 has a statistical weight of 2 x ½ + 1 = 2.

Using the energy level diagram provided, calculate, for sodium, the following parameters.

1. a) The relative intensity of the emission lines corresponding to the transitions

(4p) 2P3/2 >  (3s) 2S1/2  and (3p) 2P3/2 >  (3s) 2S1/2  in an atom cell at a temperature of 2000 K.

1. b) Given that there are 1010 sodium atoms in the ground [ (3s) 2S1/2 ] state, calculate the population of the (4s) 2S1/2 level in a system in thermal equilibrium at a temperature of 2500 K.

Excited CaOH species (CaOH*) emit at 554 nm.

• Excited state CaO species (CaO*) emit at 606 and 622 nm
• Note that red colour for calcium actually comes from CaO species formed in the flame.
• These are the strongest lines – there are (lots of) others.

A plasma is a highly ionised (and high energy) gas.

• This can be created and sustained by the continuous input of energy.
• Can use an electrical discharge or couple in the energy by a variety of mechanisms.
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[Accessed 07 June 2023].

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