In high-temperature sources, sodium atoms emit a doublet with an average wavelen
ID: 493315 • Letter: I
Question
In high-temperature sources, sodium atoms emit a doublet with an average wavelength of 1139 nm. the transition responsible is from the 4s to 3p state. Calculate the ratio of the number of excited atoms in the 4s state to the number in the ground 3s state over the temperature range from an acetylene/oxygen, and for a plasma source at 8000 degree C a. For acetylene/oxygen flame at 3000 degree C Why does CaOH give a broad band spectrum while barium gives a line spectrum? Why are flames used preferentially in atomic absorption spectroscopy while plasmas are more popular for atomic emission spectroscopy?Explanation / Answer
Flame is most popularly used in atomic absorption spectroscopy, because it emits radiations in visible spectrum that is absorbed by different atoms give different color in flame that can easily distinguishable.
Plasma are more popular for atomic emission spectroscopy because, plasma emits very high energy radiation that can ionize atoms to give emission spectrum.