Publications

Highlight

Oxygen atom densities were measured in situ in a CO2 glow discharge, at pressures between 0.2 and 5 Torr (26.7–666.6 Pa). Two measurement techniques were compared, namely optical emission actinometry (using Ar as the actinometer) and high-resolution two-photon absorption laser induced fluorescence normalised to Xe, and were found to give consistent results. The variation of the atomic oxygen density with gas pressure shows two different regimes with a transition around 1 Torr. Measurements of the O atom loss frequency under plasma exposure showed that this behaviour is caused by a change in the O atom loss mechanisms, which are dominated by surface processes in our experimental conditions. The corresponding recombination probabilities on Pyrex γO are found to vary with the gas temperature near the wall for a constant surface temperature, similarly to what has recently been obtained in pure O2. However, the measured values are more than two times lower than γO obtained in a O2 plasma in similar conditions. The O atom densities are also compared to the dissociation fraction of CO2 determined by infra-red absorption. The obtained CO and O densities show different behaviour as a function of the energy input. The simultaneous measurement of gas temperature, electric
field, O, CO and CO2 densities and O atoms loss frequency in the same conditions provides an ideal set of constraints for validating CO2 plasma kinetic models

AnaSofiaCover.png
2019
  • P. Ogloblina, A. S. Morillo-Candas, T. Silva, O. Guaitella and V. Guerra

"CO2 plasmas: from solar fuels to oxygen production on Mars"

nature conference, Advances and Applications of Plasma Physics, p. 33, S. Petersburg, Russia, September 2019. ISBN 978-5-7422-6677-8.

  • T. C. Dias, A. S. Morillo-Candas, A. Chatterjee, J. P. Booth, V. Guerra, T. Silva and O. Guaitella

"The role of oxygen atoms in CO2-O2 plasmas"

in nature conference, Advances and Applications of Plasma Physics, p. 94, S. Petersburg, Russia, September 2019. ISBN 978-5-7422-6677-8

  • V. Guerra, T. C. Dias, M. Machado da Costa, and A. S. Morillo-Candas

"It's all about Monte Carlo"

in V Workshop on non-equilibrium processes, Belgrade, Serbia, July 2019

  • V. Guerra, T. Silva, M. Grofulović, L. Terraz, P. Ogloblina, C. D. Pintassilgo, R. Engeln, A. S. Morillo-Candas and O. Guaitella

"Towards a reaction mechanism of non-equilibrium CO2 plasmas"

in XXXIV ICPIG & ICRP-10 (XXXIV International Conference on Phenomena in Ionized Gases, 10th International Conference on Reactive Plasmas), TL-07, Sapporo, Japan, July 2019

  • A. S. Morillo-Candas, C. Drag, J. P. Booth, T. C. Dias, V. Guerra and O. Guaitella

"Oxygen atom kinetics in CO2 plasmas ignited in a DC glow discharge"

Plasma Sources Sci. Technol. 28 (2019) 075010

  • J. P. Booth, O. Guaitella, A .Chatterjee, C. Drag, V. Guerra, D. Lopaev, S. Zyryanov, T. Rakhimova, D. Voloshin and Yu. Mankelevich

"Oxygen (3P) atom recombination on a Pyrex surface in an O2 plasma"

Plasma Sources Sci. Technol. 28 (2019) 055005

  • P. Ogloblina, T. Silva, M. Grofulović, L. Terraz, V. Guerra, A. S. Morillo-Candas and O. Guaitella

"CO2 plasmas: from solar fuels to oxygen production on Mars"

in ISPC24 (24th International Symposium on Plasma Chemistry), I-4, Napoli, Italy, June 2019

  • A. Silva, A. S. Morillo-Candas, A. van de Steeg, O. Guaitella, V. Guerra and G. van Rooij

"Ar addition to CO2 plasmas for controlling dissociation and vibrational excitation"

in ISPC24 (24th International Symposium on Plasma Chemistry), O-67, Napoli, Italy, June 2019

  • M. Grofulović, T. Silva, V. Guerra, O. Guaitella, R. Engeln and C. D. Pintassilgo

"Modelling the time-dependent gas heating in low-pressure CO2 and N2 pulsed DC discharges"

in ISPC24 (24th International Symposium on Plasma Chemistry), O-20, Napoli, Italy, June 2019

  • C. Verheyen, T. Silva, V. Guerra and A. Bogaerts

"Kinetic Modelling for a CO2-H2O-Plasma: a Vibrational Kinetics Study"

in ISPC24 (24th International Symposium on Plasma Chemistry), P2.2, Napoli, Italy, June 2019

  • A. S. Morillo-Candas, B. L. M. Klarenaar, T. Silva, R. Engeln, V. Guerra and O. Guaitella

"Time-evolution of the CO2 conversion studied by in situ FTIR absorption and isotopic exchange"

in ISPC24 (24th International Symposium on Plasma Chemistry), P2.1, Napoli, Italy, June 2019

  • P. Ogloblina, V. Guerra, A. S. Morillo-Candas and O. Guaitella

"Influence of carbon monoxide on CO2 plasma"

in ISPC24 (24th International Symposium on Plasma Chemistry), P1.34, Napoli, Italy, June 2019

  • M. Grofulović, B. L. M. Klarenaar, O. Guaitella, V. Guerra and R. Engeln

"A rotational Raman study under non-thermal conditions in pulsed CO2-N2 and CO2-O2 glow discharges"

Plasma Sources Sci. Technol. 28 (2019) 045014

2018
2017

  • V. Guerra, T. Silva, M. Grofulović, L. Terraz, P. Ogloblina and O. Guaitella

"CO2 plasmas: from solar fuels on Earth to oxygen production on Mars"

in 5th International Workshop Plasma Science & Interfaces, p. 66, St. Gallen, Switzerland, October 2018.

  • T. Silva, M. Grofulović, L. Terraz, C. D. Pintassilgo and V. Guerra

"Modelling the input and relaxation of vibrational energy in CO2 plasmas"

J. Phys. D: Appl. Phys  51 (2018) 464001

  • V. Guerra, T. Silva and O. Guaitella

"Living on Mars: how to produce oxygen and fuel to get home"

Feature Article in Europhysics News 49(3) (2018) 15-18

  • A. Annušová, D. Marinov, J. P. Booth, N. Sirse, M. Lino da Silva, B. Lopez and V. Guerra

"Kinetics of highly vibrationally excited O2(X) molecules in inductively-coupled oxygen plasmas"

Plasma Sources Sci. Technol. 27 (2018) 045006

  • L. L. Alves, A. Bogaerts, V. Guerra and M.M. Turner

"Foundations of modelling of nonequilibrium low-temperature plasmas"

Plasma Sources Sci. Technol. 27 (2018) 023002

  • T. Silva, M. Grofulvić, B. L. M. Klarenaar, A. S. Morillo-Candas, O. Guaitella, R. Engeln, C. D. Pintassilgo and V. Guerra

"Kinetic study of low-temperature CO2 plasmas under non-equilibrium conditions. I. Relaxation of vibrational energy"

Plasma Sources Sci. Technol. 27 (2018) 015019

  • P. Ogloblina, A. Tejero-del-Caz, V. Guerra and L. L. Alves

"Electron kinetics in CO2/CO mixtures"

in ESCAMPIG XXIV (Europhyscis Conference on Atomic and Molecular Physics of Ionized Gases), p. 78, Glasgow, Uk, July 2018

  • A. S. Morillo-Candas, C. Gonçalves, B. L. M. Klarenaar, J. P. Booth, C. Drag, V. Guerra and O. Guaitella

"Effect of high surface-area on CO2 plasma kinetics"

in ESCAMPIG XXIV (Europhyscis Conference on Atomic and Molecular Physics of Ionized Gases), p. 93, Glasgow, UK, July 2018

  •  A. Silva, A. S. Morillo-Candas, P. Ogloblina, B. Klarennaar, T. Silva, A. Tejero-del-Caz, L. L. Alves, V. Guerra and O. Guaitella,

"DC discharges on CO2/Ar mixtures: modelling and experiment"

in ESCAMPIG XXIV (Europhyscis Conference on Atomic and Molecular Physics of Ionized Gases), p. 97, Glasgow, UK, July 2018

  •  M. Grofulović, B. L. M. Klarenaar, A. S. Morillo-Candas, M. C. M. van de Sanden, V. Guerra, O. Guaitella and R. Engeln

"A rotational Raman study under non-thermal conditions in pulsed CO2/N2 and CO2 /O2 glow discharges"

in ESCAMPIG XXIV (Europhyscis Conference on Atomic and Molecular Physics of Ionized Gases), p. 186, Glasgow, UK, July 2018

  •  A. S. Morillo-Candas, B. L. M. Klarenaar, M. Grofulović, C. Drag, J. P. Booth, V. Guerra and O. Guaitella

"Comparison of gas temperature measurements with Raman, FTIR and HR-TALIF"

ESCAMPIG XXIV (Europhyscis Conference on Atomic and Molecular Physics of Ionized Gases), p. 210, Glasgow, UK, July 2018

  •  T. Silva T, M. Grofulović, L. Terraz, B. L. M. Klarenaar, A. S. Morillo-Candas, C. D. Pintassilgo, O. Guaitella, R. Engeln and V. Guerra

"Understanding the electron and vibration kinetics in CO2 plasmas" 

in ESCAMPIG XXIV (Europhyscis Conference on Atomic and Molecular Physics of Ionized Gases), p. 307, Glasgow, UK, July 2018

  •  L. Terraz, T. Silva, A. S. Morillo-Candas, O. Guaitella and V. Guerra

"N2 influence on the vibrational distribution of the asymmetric level of CO2"

in ESCAMPIG XXIV (Europhyscis Conference on Atomic and Molecular Physics of Ionized Gases), p. 314, Glasgow, UK, July 2018

  •  V. Guerra, T. Silva, P. Ogloblina, M. Grofulović, L. Terraz, H. Rodrigues, C. Gonçalves, A. Silva, N.Pinhão, C. D. Pintassilgo, A. Tejero-del-Caz, L. L. Alves, A. S. Morillo-Candas and O. Guaitella

"Energy transfer pathways in CO2-containing DC discharges" 

in 45th EPS (European Physical Society Conference on Plasma Physics), P4.3012, Prague, Czech Republic, July 2018

  • M. Grofulović, T. Silva, V. Guerra, C. D. Pintassilgo, B. L. M. Klarenaar, R. Engeln, A. S. Morillo-Candas and O. Guatiella

Vibrational kinetics of non-equilibrium CO2 plasma discharge in low-excitation regime, 70thGEC (Gaseous Electronics Conference), Pittsburgh, Pennsylvania, E.U.A., Novembro de 2017. Bull Am. Phys. Soc.62(2017) MW2.02.

  • V. Guerra, T. Silva, M. Grofulović, A. Annušová, L. Terraz, P. Ogloblina, J. Vargas, M. Lino da Silva, C. D. Pintassilgo and L. L. Alves

 "Evidence and modeling of vibrational excitation in N2, O2 and CO2 plasmas"

in 20th International Summer School on Vacuum, Electron and Ion Technologies (VEIT 2017), p. 50, Sozopol, Bulgaria, September 2017

  • V. Guerra, T. Silva, P. Ogloblina, M. Grofulović, L. Terraz, M. Lino da Silva, C. D. Pintassilgo, L. L. Alves and O. Guaitella

"The case for in situ resource utilisation for oxygen production on Mars by nonequilibrium plasmas"

Plasma Sources Sci. Technol. 26 (2017) 11LT01

  • T. Silva, M. Grofulović, B. L. M. Klarenaar, O. Guaitella, R. Engeln and V. Guerra

"Modeling the input and relaxation of vibrational energy in CO2 plasmas"

in 23rd International Symposium on Plasma Chemistry (ISPC 23), Montréal, Canada, August 2017

  • D. Marinov and V. Guerra

"Kinetic MonteCarlo modelling of surface processes in reactive plasmas"

in iPlasmaNano-VIII 2017, Antwerp, Belgium, July 2017

  • V. Guerra and D. Marinov

"Challenges in the modelling of plasma-surface interactions"

in XXXIII International Conference on Phenomena in Ionized Gases (XXXIII ICPIG), p. 48, Estoril, Portugal, July 2017

  • T. Silva, M. Grofulović, B. L. M. Klarenaar, O. Guaitella, R. Engeln, C. D. Pintassilgo and V. Guerra

"Understanding the electron and vibration kinetics in CO2 plasmas"

in XXXIII International Conference on Phenomena in Ionized Gases (XXXIII ICPIG), p. 298, Estoril, Portugal, July 2017

  • P. Ogloblina, A. Tejero-del-Caz, V. Guerra and L. L. Alves

"Complete and consistent set of electron-neutral scattering cross sections for carbon monoxide"

in XXXIII International Conference on Phenomena in Ionized Gases (XXXIII ICPIG), p. 205, Estoril, Portugal, July 2017

  • M. Grofulović, T. Silva and V. Guerra

"Sensitivity and uncertainty analysis of a kinetic model for CO2 non-equilibrium plasmas"

in XXXIII International Conference on Phenomena in Ionized Gases (XXXIII ICPIG), p. 293, Estoril, Portugal, July 2017

  • L. Terraz, T. Silva, D. Nina, N. Pinhão, O. Guaitella and V. Guerra

"N2 influence on the vibrational distribution of the asymmetric level of CO2"

in XXXIII International Conference on Phenomena in Ionized Gases (IXXXIII CPIG), p. 256, Estoril, Portugal, July 2017

  • A. S. Morillo-Candas, B. L. M. Klarenaar, R. Engeln, A. Chatterjee, J. P. Booth, T. Silva, V. Guerra and O. Guaitella

"O atom kinetics in CO2 pulsed glow discharge"

in XXXIII International Conference on Phenomena in Ionized Gases (IXXXIII CPIG), p. 274, Estoril, Portugal, July 2017

  • P. Ogloblina, A. Tejero-del-Caz, V. Guerra and Luís L. Alves

"Cross sections for electron collisions with carbon monoxide"

in 21st International Colloquium in Plasma Processes (CIP 2017), poster contributions p. 10, Nice, France, June 2017

  • O. Guaitella, A.S. Morillo-Candas, B. L. M. Klarenaar, R. Engeln, T. Silva and V. Guerra

"Vibrational kinetics, gas temperature evolution and molecule conversion in CO2 pulsed glow discharge"

in 21st International Colloquium in Plasma Processes (CIP 2017), oral contributions p. 76, Nice, France, June 2017

  • V. Guerra, T. Silva, M. Grofulović, C. D. Pintassilgo, B. L. M. Klarenaar, A.S. Morillo-Candas, R. Engeln and O. Guaitella

"Vibrational energy transfers in low-excitation CO2 plasmas"

in in 21st International Colloquium in Plasma Processes (CIP 2017), Oral contributions p. 74, Nice, France, June 2017

  • V. Guerra and D. Marinov

"Kinetic Monte Carlo algorithms for surface kinetics"

in The Physics of Low Temperature Plasma (PLTP), ISBN 978-5-9222-1167-3, p. 26, Kazan, Russia, June 2017

  • M. Vass, I. Korolov, D. Loffhagen, N. Pinhão and Z. Donkó​​

"Electron transport parameters in CO2: scanning drift tube measurements and kinetic computations"

Plasma Sources Sci. Technol. 26 (2017) 065007

  • D. Marinov, C. Teixeira and V. Guerra,

"Deterministic and Monte Carlo methods for simulation of plasma-surface interactions"

Plasma Process. Polym. 14 (2017) 1600175

2016
  • M. Grofulović, L.L. Alves and V. Guerra,

"Electron-neutral scattering cross sections for CO2: a complete and consistent set and an assessment of dissociation" 

J. Phys. D: Appl. Phys. 49 (2016) 395207

  • V. Guerra, C. Teixeira and D. Marinov

"Modelling heterogeneous reactions of oxygen-containing plasmas on silica surfaces"

in 28th Summer School and International Symposium on the Physics of Ionised Gases (SPIG) / 4th International Workshop on Non-Equilibrium Processes (NonEqProc), p. 453, Belgrade, Serbia, August 2016

  • M. Grofulović, L.L. Alves and V. Guerra

"Swarm Analysis and Dissociation Cross Sections for CO2"

in 28th Summer School and International Symposium on the Physics of Ionised Gases (SPIG), p. 100, Belgrade, Serbia, August 2016

  • M. Grofulović, V. Guerra, P. Coche and L.L. Alves

"The updates in the IST-LISBON database with LXCat: electron scattering cross sections for oxygen and carbon dioxide"

in 69th Annual Gaseous Electronics Conference (GEC), Bochum, Germany, October 2016

© 2016 by Vasco Guerra. Proudly created with Wix.com

This site was designed with the
.com
website builder. Create your website today.
Start Now