scholarly journals A passive measurement of dissociated atom densities in atmospheric pressure air discharge plasmas using vacuum ultraviolet self-absorption spectroscopy

2014 ◽  
Vol 115 (12) ◽  
pp. 123302 ◽  
Author(s):  
George Laity ◽  
Andrew Fierro ◽  
James Dickens ◽  
Klaus Frank ◽  
Andreas Neuber
Keyword(s):  
Absorption Spectroscopy ◽  
Atmospheric Pressure ◽  
Vacuum Ultraviolet ◽  
Passive Measurement ◽  
Discharge Plasmas ◽  
Air Discharge

Theoretical Analysis of Ionization in Long-Term Air Discharge Plasmas at Atmospheric Pressure

2016 ◽  
Vol 44 (11) ◽  
pp. 2530-2535 ◽  
Author(s):  
Nikolay V. Ardelyan ◽  
Vladimir L. Bychkov ◽  
Konstantin V. Kosmachevskii
Keyword(s):  
Theoretical Analysis ◽  
Atmospheric Pressure ◽  
Discharge Plasmas ◽  
Air Discharge

scholarly journals Roles of membrane protein damage and intracellular protein damage in death of bacteria induced by atmospheric-pressure air discharge plasmas

RSC Advances ◽  
2018 ◽  
Vol 8 (38) ◽  
pp. 21139-21149 ◽  
Author(s):  
Hao Zhang ◽  
Jie Ma ◽  
Jie Shen ◽  
Yan Lan ◽  
Lili Ding ◽  
...  
Keyword(s):  
Membrane Protein ◽  
Atmospheric Pressure ◽  
Protein Damage ◽  
Intracellular Protein ◽  
Plasma Sterilization ◽  
Biochemical Pathways ◽  
Discharge Plasmas ◽  
Underlying Mechanisms ◽  
Air Discharge

Although plasma sterilization has attracted much attention, the underlying mechanisms and biochemical pathways are still not fully understood.

EXPERIMENTAL STUDY OF REACTION OF ETHANOL WITH OXYGEN BEHIND SHOCK WAVES USING ATOMIC RESONANCE ABSORPTION SPECTROSCOPY METHOD

2020 ◽  
Author(s):  
N. S. Bystrov ◽  
◽  
A. V. Emelianov ◽  
A. V. Eremin ◽  
P. I. Yatsenko ◽  
...  
Keyword(s):  
Experimental Study ◽  
Shock Waves ◽  
Absorption Spectroscopy ◽  
Vacuum Ultraviolet ◽  
Resonance Absorption ◽  
Atomic Resonance ◽  
Quantitative Measurements ◽  
Series Of Experiments ◽  
Kinetics Of Reaction ◽  
Oxygen Atoms

The kinetics of reaction of C2H5OH with N2O behind shock waves is studied. The quantitative measurements of the time profiles of concentration of O atoms were carried out by the method of atomic resonance absorption spectroscopy (ARAS) using resonance vacuum-ultraviolet line of O-atom at 130.5 nm. For the calibration of absorption intensity of oxygen atoms depending on its concentration, the special series of experiments in the mixture containing different amounts of N2O in Ar was carried out at T = 2100 ± 50 K when molecule of N2O is completely dissociated. An experimental study of the appearance and consumption of oxygen atoms during the reaction of ethanol with oxygen in mixture 10 ppm N2O + (10 ... 0.1) ppm C2H5OH + Ar at temperatures of 16002300 K and pressures of 200-300 kPa have been carried out. A kinetic analysis of obtained data was performed using the Chemkin package.

Diagnostics of N2dissociation in RF plasmas by vacuum ultraviolet emission and absorption spectroscopy

2008 ◽  
Vol 17 (2) ◽  
pp. 024018 ◽  
Author(s):  
Takeshi Kitajima ◽  
Toshiki Nakano ◽  
Seiji Samukawa ◽  
Toshiaki Makabe
Keyword(s):  
Absorption Spectroscopy ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Emission ◽  
Rf Plasmas

Plasma agriculture based on quantitative monitoring of reactions between fungal cells and atmospheric-pressure plasmas

2012 ◽  
Vol 1469 ◽  
Author(s):  
Masafumi Ito ◽  
Takayuki Ohta ◽  
Keigo Takeda
Keyword(s):  
Uv Radiation ◽  
Absorption Spectroscopy ◽  
Ground State ◽  
Atmospheric Pressure ◽  
Atomic Oxygen ◽  
Fungal Spores ◽  
Ultra Violet ◽  
High Density ◽  
Inactivation Rate ◽  
The Absolute

ABSTRACTA high-density non-equilibrium atmospheric pressure plasma (NEAPP) applied for inactivating fungal spores of P. digitatum is introduced as an environmentally safe and rapid-inactivation method. The contributions of ozone, ultra violet (UV) radiation and ground-state atomic oxygen in the NEAPP on the inactivation of the spores are evaluated using colony count method.The absolute densities of ozone were measured by using ultraviolet absorption spectroscopy. The ozone density increased from 2 to 8 ppm with an increase in the distance from the plasma source, while the inactivation rate decreased. The inactivation rate of plasma was evaluated to be thousand times higher than that of an ozone generator using the integrated number density of ozone. In addition, it was clarified that the contribution of UV radiation to inactivation was not dominant for P. digitatum inactivation by NEAPP by filtering the active species using quartz plate. From these results, we can speculate that the inactivation efficiency of reactive oxygen species (ROS) will be larger than those of others.In order to investigate the effect of ground-state atomic oxygen as one of ROS, the inactivation of P. digitatum spores using an oxygen radical source that employs a high-density atmospheric-pressure O2/Ar plasma. The absolute O density was measured to be 1.4×1014 and 1.5×1015 cm–3 using vacuum ultra violet absorption spectroscopy (VUVAS) using a microdischarge hollow cathode lamp. The behaviors of the O densities as a function of O2/(Ar+O2) mixture flow rate ratio correspond to that of the inactivation rate. This result indicates that ground-state atomic oxygen is concluded to be the dominant species that causes inactivation.

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