Lawrence Overzet

The University of Texas at Dallas

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Co-Authors

Matthew Goeckner

The University of Texas at Dallas

101

Rémi Dussart

Groupe de Recherches sur l'Energétique des Milieux Ionisés

Philippe Lefaucheux

Groupe de Recherches sur l'Energétique des Milieux Ionisés

P. Ranson

Université d'Orléans

Mukesh Kulsreshath

University of Bristol

Olivier Aubry

Université d'Orléans

Thomas Tillocher

Groupe de Recherches sur l'Energétique des Milieux Ionisés

Valentin Félix

Groupe de Recherches sur l'Energétique des Milieux Ionisés

Thierry Dufour

Centre Hospitalier Universitaire Amiens-Picardie

Volker Schulz-von der Gathen

Ruhr University Bochum

Cooperative Institutions

The University of Texas at Dallas

Centre National de la Recherche Scientifique

Groupe de Recherches sur l'Energétique des Milieux Ionisés

Université d'Orléans

The University of Texas at Austin

University of Illinois Urbana-Champaign

Seoul National University

Samsung (South Korea)

The University of Texas Southwestern Medical Center

Plasma (Russia)

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Direct injection of liquids into low pressure plasmas

Bulletin of the American Physical Society (2006)

Matthew Goeckner Daisuke Ogawa Richard B. Timmons Lawrence Overzet S. Fraga Sanchez

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Thermal side effects during pulsed field ablation: An analysis using computer modeling

EP Europace (2025)

Marcela Mercado‐Montoya Tatiana Gomez Bustamante Steven Mickelsen Erik Kulstad Ana González‐Suárez

10.1093/europace/euaf035

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Time-resolved power and impedance measurements of pulsed radiofrequency discharges

Plasma Sources Science and Technology (1995)

Lawrence Overzet F Y Leong-Rousey

The power to a pulsed RF discharge in the Gaseous Electronics Conference reference reactor has been measured with sub-microsecond time resolution. There are large swings in the power delivered to the cell as a function of time during the first 5-10 mu s of the transient turn-on and turn-off. These power oscillations are in large part caused by the passive circuitry between the current-voltage sensors and the electrode assembly of the cell and have been modelled using an equivalent network with reasonable accuracy. They make it difficult to determine the plasma impedance at very early times during the discharge turn-on. This passive circuitry can also store RF energy and release it both to the plasma and to the RF generator at plasma turn-off. The power delivered to a 500 mTorr argon discharge does not reach steady state until approximately 500 mu s after the discharge turn-on even though the initial power oscillations end within the first 10 mu s. This longer term power variation appears to be related to a contraction of the electrode sheaths as well as to an electron density increase and electron temperature decrease during this time. As the sheath contracts, less of the RF field penetrates to the body of the glow and the electron atom collision frequency, which is related to the electron average energy, decreases by a factor of two.

Pulsed Power

10.1088/0963-0252/4/3/013

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Citations (33)

Characterization of a modified Gaseous Electronics Conference (mGEC) Reference Cell and the effects of wall material.

APS Annual Gaseous Electronics Meeting Abstracts (2002)

Eric Joseph Baosuo Zhou Yonghua Liu Lawrence Overzet Matthew Goeckner

Characterization

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Factors affecting the 13.56-MHz radio-frequency-mediated heating of gold nanoparticles

Applied Spectroscopy Reviews (2017)

Paul Pantano Cheri D. Harrison John Poulose David Urrabazo Trevor Q. Norman

The use of radio-frequency (RF) energy for the thermal activation of tumor-targeted nanoparticles (NPs) is a promising non-invasive hyperthermic treatment because RF waves penetrate deep through tissue. Nonetheless, while the approach has been demonstrated using gold (Au) and iron oxide NPs, the RF-mediated heating mechanism of AuNPs has been controversial. A part of the reason is that measuring and modeling the heating of AuNPs in an RF field is a complex endeavor that depends on the chemical and physical properties of the AuNPs, interfacial phenomena involving AuNP coatings and the sample medium, and the antenna design and characteristics of the RF field. Herein, the mechanisms and factors affecting the 13.56-MHz RF-mediated heating of AuNPs are reviewed, a new factor concerning the thermal isolation of RF antennae is presented, and the ability of a new water-free cooling system to thermally isolate samples from the heat generated by metal RF-induction coils is demonstrated.

Induction Heating

Dielectric Heating

RF probe

10.1080/05704928.2017.1314299

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Citations (15)

Fabrication process and electrical characterization of direct current parallel microdischarges in helium

HAL (Le Centre pour la Communication Scientifique Directe) (2007)

Monali Mandra Rémi Dussart Jeong‐Bong Lee Matthew Goeckner Thierry Dufour

Characterization

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Pulsed plasma polymerization of Ethylene Glycol for development of ultra thin biocompatible interfaces

APS (2009)

Gabriel Padron-Wells Isabel C Estrada-Raygoza Lawrence Overzet Matthew Goeckner

Biocompatible material

Plasma polymerization

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Plasma polymerization of 2-chloro-p-xylene to produce a crystalline plasma parylene C film

APS (2013)

Isabel C Estrada-Raygoza Stephan L. Thamban Lawrence Overzet Matthew Goeckner

Plasma polymerization

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Time-resolved energy distribution of F− from pulsed radio frequency discharges

Journal of Applied Physics (1995)

Brian A. Smith Lawrence Overzet

Negative ions extracted from a pulsed rf discharge can have a complex energy dependence as a function of time. This dependence could influence semiconductor processing in pulsed discharges, particularly if precise control of the ion energy is important. In this article, the time-dependent ion energy distributions of F− from pulsed discharges through CF4 are presented for the first time using a mass spectrometer equipped with a Bessel Box energy analyzer. The time-dependent changes in the ion energy distributions are produced by the manner in which the plasma disintegrates. Negative ions reaching the processing surface very early in the afterglow have lower energies because they experience less acceleration by the dc bias potential before entering the mass spectrometer. These ions appear in a very intense, short duration pulse, suggesting that they are formed in the after glow near the entrance to the mass spectrometer. Ions reaching the surface later in the afterglow have higher energies because they travel further through the dc bias potential. These ions appear with less intensity over a longer period of time.

Quadrupole mass analyzer

10.1063/1.360682

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Citations (12)

Effect of pressure gradients on plasma characteristics

APS (1999)

Keith R. Thompson Lawrence Overzet

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