Optical and spectroscopic study of a supersonic flowing helium plasma: energy transport in the afterglow.

08:00 EDT 20th March 2020 | BioPortfolio

Summary of "Optical and spectroscopic study of a supersonic flowing helium plasma: energy transport in the afterglow."

Flowing plasma jets are increasingly investigated and used for surface treatments, including biological matter, and as soft ionization sources for mass spectrometry. They have the characteristic capability to transport energy from the plasma excitation region to the flowing afterglow, and therefore to a distant application surface, in a controlled manner. The ability to transport and deposit energy into a specimen is related to the actual energy transport mechanism. In case of a flowing helium plasma, the energy in the flowing afterglow may be carried by metastable helium atoms and long-lived helium dimer ions. In this work a systematic investigation of the optical and spectroscopic characteristics of a supersonic flowing helium plasma in vacuum and its afterglow as function of the helium gas density is presented. The experimental data are compared with numerical modeling of the plasma excitation and helium dimer ion formation supported by a Computational Fluid Dynamic simulation of the helium jet. The results indicate that the plasma afterglow is effectively due to helium dimer ions recombination via a three-body reaction.


Journal Details

This article was published in the following journal.

Name: Scientific reports
ISSN: 2045-2322
Pages: 5087


DeepDyve research library

PubMed Articles [21675 Associated PubMed Articles listed on BioPortfolio]

Collisionless Shocks Driven by Supersonic Plasma Flows with Self-Generated Magnetic Fields.

Collisionless shocks are ubiquitous in the Universe as a consequence of supersonic plasma flows sweeping through interstellar and intergalactic media. These shocks are the cause of many observed astro...

Plasma Collision in a Gas Atmosphere.

We present a study on the impact of a gas atmosphere on the collision of two counterpropagating plasmas (gold and carbon). Imaging optical Thomson scattering data of the plasma collision with and with...

Inhibition of bacterial growth on zirconia abutment with a helium cold atmospheric plasma jet treatment.

This study presents a surface modification method to treat the zirconia implant abutment materials using a helium cold atmospheric plasma (CAP) jet in order to evaluate its efficacy on oral bacteria a...

Helium Plasma Skin Regeneration: Evaluation of Skin Tissue Effects in a Porcine Model and Comparison to Nitrogen Plasma Skin Regeneration.

Helium plasma skin regeneration (PSR) is a novel skin rejuvenation technology with significant differences compared with nitrogen PSR technology but that may exert similar skin tissue effects. Study o...

Experimental exploration of a mixed helium/carbon beam for online treatment monitoring in carbon ion beam therapy.

Recently, it has been proposed that a mixed helium/carbon beam could be used for online monitoring in carbon ion beam therapy. Fully stripped, the two ion species exhibit approximately the same mass/c...

Clinical Trials [6050 Associated Clinical Trials listed on BioPortfolio]

Non-Invasive Optical Spectroscopic Methods for Dehydration Identification in Marathon Trainees

Dehydration can result from exposure to harsh environments including hot and dry desert climates. Soldiers and non-military workers are frequently required to work in hot, dry conditions,...

Repeatability in Hyperpolarized 3-Helium With MRI

The main purpose of this study is to assess and test the reproducibility and results of hyperpolarized 3-Helium gas as a contrast agent with Magnetic Resonance Imaging (MRI) of the lungs i...

Optical Spectroscopy for Cutaneous Cancer

1. Purpose and objective: Determine spectroscopic differences between tumor, dysplasia, and normal cutaneous tissue as assessed by histopathologic diagnosis. If successful, the ...

Asthma Exacerbation and Helium-3 MRI

The goal of this research is to use Helium-3 MRI to see the changes in airflow of the lungs at different times of an attack. These three stages are immediately after the attack, 1 month la...

Healthy Lung Study- Development of 3 Tesla MRI Hardware and Software for Helium-3 Gas Imaging of the Lung: Healthy Volunteer Development Study

Healthy volunteers aged 18-75 will undergo hyperpolarized 3-Helium MRI and pulmonary function testing for the development of tools to assess image signal to noise and reproducibility of sp...

Medical and Biotech [MESH] Definitions

The amount of PLASMA flowing to the parts of the KIDNEY that function in the production of urine. It is the amount of plasma perfusing the KIDNEY TUBULES per unit time, generally measured by P-AMINOHIPPURATE clearance. It should be differentiated from RENAL PLASMA FLOW which is approximately 10% greater than the effective renal plasma flow.

The amount of PLASMA that perfuses the KIDNEYS per unit time, approximately 10% greater than effective renal plasma flow (RENAL PLASMA FLOW, EFFECTIVE). It should be differentiated from the RENAL BLOOD FLOW; (RBF), which refers to the total volume of BLOOD flowing through the renal vasculature, while the renal plasma flow refers to the rate of plasma flow (RPF).

The use of light interaction (scattering, absorption, and fluorescence) with biological tissue to obtain morphologically based information. It includes measuring inherent tissue optical properties such as scattering, absorption, and autofluorescence; or optical properties of exogenous targeted fluorescent molecular probes such as those used in optical MOLECULAR IMAGING, or nontargeted optical CONTRAST AGENTS.

The study of the energy of electrons ejected from matter by the photoelectric effect, i.e., as a direct result of absorption of energy from electromagnetic radiation. As the energies of the electrons are characteristic of a specific element, the measurement of the energy of these electrons is a technique used to determine the chemical composition of surfaces.

Radiotherapy using high-energy (megavolt or higher) ionizing radiation. Types of radiation include gamma rays, produced by a radioisotope within a teletherapy unit; x-rays, electrons, protons, alpha particles (helium ions) and heavy charged ions, produced by particle acceleration; and neutrons and pi-mesons (pions), produced as secondary particles following bombardment of a target with a primary particle.

Quick Search

DeepDyve research library

Relevant Topics

Blood is a specialized bodily fluid that delivers necessary substances to the body's cells (in animals) – such as nutrients and oxygen – and transports waste products away from those same cells.  In vertebrates, it is composed of blo...

Biological Therapy
Biological therapy involves the use of living organisms, substances derived from living organisms, or laboratory-produced versions of such substances to treat disease. Some biological therapies for cancer use vaccines or bacteria to stimulate the body&rs...

Searches Linking to this Article