Spectroscopy

Here you can read a comprehensive explanation of UV-Vis spectroscopy:

http://www.chemguide.co.uk/analysis/uvvisiblemenu.html#top


Why are complex ions of transition metals and many organic molecules coloured? You can read on these two sites:


http://www.chemguide.co.uk/inorganic/complexions/colour.html

http://www.cem.msu.edu/~reusch/VirtualText/Spectrpy/UV-Vis/spectrum.htm

Mass spectrometry is a powerful technique to determine the relative atomic masses:
http://www.colby.edu/chemistry/OChem/DEMOS/MassSpec.html
http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Spectrpy/MassSpec/masspec1.htm#ms1

Here are some videos from Royal Society of Chemistry about different spectroscopic techniques:

http://www.youtube.com/watch?v=DDTIJgIh86E&feature=relmfu
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Atomic absorption spectroscopy (AAS) used to determine low concentration of metal ions:

http://www.youtube.com/watch?v=L3OFSJ8ZHog&feature=related

http://www.easychem.com.au/monitoring-and-management/manufactured-products/atomic-absorption-spectroscopy-aas