Author : Farzad Fani-Pakdel
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (489 download)
Book Synopsis Microsecond Pulsed Grimm Glow Discharge Time-of-flight Mass Spectrometry Study of Aerosols Generated by Nebulization and Laser Ablation by : Farzad Fani-Pakdel
Download or read book Microsecond Pulsed Grimm Glow Discharge Time-of-flight Mass Spectrometry Study of Aerosols Generated by Nebulization and Laser Ablation written by Farzad Fani-Pakdel and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: At the optimum condition and heating the cathode to 75 degrees Celsius, a sensitivity of approximately 1.8 mV/mM for cesium was achieved. Another interesting observation was that the higher-mass ions such as cesium and iodide resulted in larger signals compared to lower-mass ions such as sodium (approximately 10:1 ratio). It was concluded that this was mainly due to the fact that more massive ions experience less scattering at the skimmer orifice. This discrimination between higher-mass and lower-mass ions was reduced by using a larger skimmer orifice (Cs[superscript +] : Na[superscript +] = 2:1). Finally, an aerosol stream was generated by laser ablation of solids in an external cell. The ablation lasers were a power-chip Nd:YAG laser and a Q-switched, flashlamp-pumped Nd:YAG laser. The samples investigated were aluminum, stainless steel, brass, bismuth alloy, ceramic and pressed pellets of inorganic salts. The effects of laser pulse frequency, energy and discharge potential on particle ionization were studied. Due to better signal stability and intensities, the laser ablation was found to be a more suitable method for aerosol generation when glow discharge is the ion source.