Laser-Based Methods

Hess, Kenneth R.

doi:10.1007/978-1-4899-2394-3_10

Cited by 3 publications

(3 citation statements)

References 176 publications

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“…Hess noted a similar phenomenon in his investigations using a steady state discharge. 47 This behavior is an interesting contrast to that observed for glow discharge alone, for which Penning excitation increases with increasing pressure. 10 The cause of this behavior in our experiments is related to the ablation and material transport process.…”

Section: Resultsmentioning

confidence: 74%

“…44,45 Only a few publications exist that investigate the utility of using a secondary glow discharge cathode as an alternative to the ICP source. 46,47,48 Laser sampling coupled to a glow discharge plasma ion source may afford a number of advantages over existing techniques. Optical and mass spectrometric detection following direct sample introduction into a glow discharge plasma may reduce fractionation problems associated with laser-based ICP-MS. 49,50 Laser-based techniques simplify sampling of nonconductors over standalone glow discharge methods.…”

Section: Introductionmentioning

confidence: 99%

“…Emission was detected using a spectrometer with a photodiode array or PMT, and demonstrated analytical sensitivities at the µg/g level. Hess used quadrupole mass spectrometric detection in the analysis of both conductors and nonconductors 47. Here, the laser target and secondary cathode were contained in the same chamber.…”

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confidence: 99%

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Characterization and applications of pulsed millisecond glow discharge sources

Lewis¹

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King his guidance over the course of this decade. Through his patience and tutelage I have learned independence and the systematic approach of being a scientist. Through his confidence in me I have grown more independent and self reliant in my ideas and abilities. I would also like to thank the Dr. Vahid Majidi and the staff of the Chemistry Science and Technology Division 9 (CST-9) at Los Alamos National Laboratory, where a significant part of this work materialized. Also, I would like to thank my committee members, for their advice and suggestions on the preparation of this thesis. The staff and faculty for their help and knowledge passed on to me over these few years. I would also like to make a special acknowledgement to Donald Feathers and Allen Burns for their patience, professional skills and engineering feats. And how can I forget my graduate peers for making this possibly the most enjoyed time of my life. Foremost, I would like to express my appreciation to my parents Oswald and Barbara Lewis for their encouragement and continued support throughout this and all of my life's endeavors. Without their love and encouragement I would not be where I am today.

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Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

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Characterization and applications of pulsed millisecond glow discharge sources

Lewis¹

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Spectroscopic characteristics of hollow cathode discharge with sample introduction by laser ablation

Karatodorov¹,

Mihailov²

2019

AIP Conference Proceedings

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Characterization of a Pulsed Glow Discharge Laser Ablation System Using Optical Emission

et al. 2000

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Investigations involving laser-based sampling of copper into an auxiliary pulsed glow discharge for ionization and excitation are presented. The interaction of the ablated copper with the auxiliary glow discharge was studied by monitoring the copper atom emission signal at 368.744 nm. Results demonstrate the ability to time ablation appropriately to access specific temporal regions of the pulsed plasma. More specifically, laser-ablated material was introduced into the glow discharge negative glow during the afterpeak. Ionization and excitation was accomplished by collisions with a metastable argon population produced by the glow discharge (Penning ionization) followed by recombination to yield excited-state Cu atoms. The work presented investigates parameters that affect the atomic emission signal intensity of the ablated material, including cathode-to-target distance, discharge gas pressure, and relative timing of discharge and ablation. Results demonstrate that decreasing the glow discharge working gas pressure increases the transport efficiency of laser-ablated material into the negative glow. These investigations are part of an ongoing series of studies on sample introduction schemes that utilize different ionization and excitation mechanisms found in pulsed glow discharge plasmas.

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Laser-Based Methods

Cited by 3 publications

References 176 publications

Characterization and applications of pulsed millisecond glow discharge sources

Characterization and applications of pulsed millisecond glow discharge sources

Spectroscopic characteristics of hollow cathode discharge with sample introduction by laser ablation

Characterization of a Pulsed Glow Discharge Laser Ablation System Using Optical Emission

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