AAS for non-metals (1 Viewer)

[mojako]

Can you use Atomic Absorption Spectroscopy to measure conc. of non-metals (or perhaps semimetals)? If not, why?

Can you use AAS to measure conc. of complex ions (which do not break down at the necessary temperature, if there are such ions... are there?)?

Thanks before.

 

[xiao1985]

i believe the answers for both is yes... aprt from complex ions, the name of the process (ATOMIC) is not necessarily accurate... there will be a definite energy gap between the highest occupied molecular orbital and the lowest unoccupied orbital, hence at a EMR of particular wave length, the complex ion can be excited and absorb that particular wave length of EMR (tho it might not be in visible range) the pattern of absorption may a bit mroe complicated though... same goes for anion...

 

[mojako]

Originally posted by xiao1985
i believe the answers for both is yes... aprt from complex ions, the name of the process (ATOMIC) is not necessarily accurate... there will be a definite energy gap between the highest occupied molecular orbital and the lowest unoccupied orbital, hence at a EMR of particular wave length, the complex ion can be excited and absorb that particular wave length of EMR (tho it might not be in visible range) the pattern of absorption may a bit mroe complicated though... same goes for anion...

Does "occupied" mean "fully occupied" and "unoccupied" mean "not fully occupied, but not empty either"?

This reminds of of physics (HSC)... Do or did you do that?
Can you somehow explain conduction band in terms of chemistry?
Can the term refer to individual atoms or must be to a chunk of molecules collectively (so the band is like a common shell of the chunk where electrons can reside)?
Thanks

 

[Xayma]

Originally posted by mojako
Can you use Atomic Absorption Spectroscopy to measure conc. of non-metals (or perhaps semimetals)? If not, why?.

Yes of course, thats how they measure the composition of stars, by the wavelengths given off and they mainly consists of Hydrogen, Helium, Carbon.

 

[xiao1985]

Originally posted by mojako
Does "occupied" mean "fully occupied" and "unoccupied" mean "not fully occupied, but not empty either"?

This reminds of of physics (HSC)... Do or did you do that?
Can you somehow explain conduction band in terms of chemistry?
Can the term refer to individual atoms or must be to a chunk of molecules collectively (so the band is like a common shell of the chunk where electrons can reside)?
Thanks

you won't really be asked on how does it work other than on cations, but:
electrons exist around every atom/molecule/ions, in discrete energy levels... so electrons can only absorb the photon with correct energy level to jump to the next discrete energy level...

so yes, AAS(well the principle that governs AAS) can be used to detect presence of complex ions and anions... providing that you know the wavelength of the EMR absorbed by the the particular complex ion you are looking for ...

 

[mojako]

Originally posted by xiao1985
you won't really be asked on how does it work other than on cations, but:

Well.. I wanted to know
Thanks for answering.