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March18_2005_2pp

March18_2005_2pp - Exam#2 solution key to be posted this...

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1 March 18, 2005 ¾ Exam #2 – solution key to be posted this weekend ¾ Office Hours Cancelled for today / 2 Instrumentation for AES Simple! Get rid of source and change the atom cell: Atomization/ Excitation Cell I Dispersive Device Detector Sample -atom cell now also needs to create excited state atoms (need higher temperature)
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3 Atomization/Excitation Sources for AES Flames - need high temperatures (4500 o C possible with O 2 /(CN) 2 flame) -need a short pathlength (eliminates problems with self-absorption) -use a total consumption burner (noisy, small, inefficient) -complementary with Flame AAS (ppm - ppb detn limits) 4 Plasma Sources for Atomization/Excitation Plasmas: hot, ionized gas Arcs and Sparks • electrical (directly coupled) ionization • useful for solid samples
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