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1 Atomic absorption spectroscopy (AAS) : A technique used to identify the presence and concentration of substances by analysing the spectrum produced when a substance is vaporised and absorbs certain frequencies of light.2  AAS is used particularly for detecting the concentrations of metal ions in solutions. Atomic absorption spectroscopy (AAS) : A technique used to identify the presence and concentration of substances by analysing the spectrum produced when a substance is vaporised and absorbs certain frequencies of light.
SCS Works to Interrupt Pain Impulses Before They Reach the Brain. With SCS, a small implanted pulse generator (or IPG) and thin wires (known as leads) are placed into the body. To manage your pain, the leads deliver tiny pulses to the nerves that mask pain signals traveling to the brain.