Presentation is loading. Please wait.

Presentation is loading. Please wait.

COOLING OF ELECTRICALLY-EXCITED He2 IN A MICROCAVITY PLASMA JET

Published byAsli Koz Modified over 5 years ago

Similar presentations

Presentation on theme: "COOLING OF ELECTRICALLY-EXCITED He2 IN A MICROCAVITY PLASMA JET"— Presentation transcript:

1 COOLING OF ELECTRICALLY-EXCITED He2 IN A MICROCAVITY PLASMA JET
Rui Su, Thomas J. Houlahan, Jr., and J. Gary Eden University of Illinois June 24, 2016

2 OVERVIEW He2 in d3Σu+ state (>24 eV, radiative lifetime ~25 ns) generated in microplasma discharge and rotationally cooled in supersonic expansion. 2D spatial-temporal evolutional spectra of dimer emission contain kinetical information during the expansion. Damped harmonic oscillation of the rotational temperature repeatedly observed.

3 MICROCAVITY PLASMA JET

4 EXPERIMENTAL ARRANGEMENT

5 TEMPORAL-SPATIAL HISTORY OF d3Σu+ FLUORESCENCE

6 INTENSITY PROFILES OF d3Σu+ FLUORESCENCE

7 TWO-TEMPERATURE FITTING OF d3Σu+
Rotational temperature evolution

8 OSCILLATION IN MULTIPLE EXPERIMENTS

9 DAMPED HARMONIC OSCILLATION

10 DAMPED HARMONIC OSCILLATION
Plasma frequency : 5e8 Hz Corresponding electron density : 7e7 cm-3 Varies within one order of magnitude among all datasets. Collisional frequency for momentum transfer or other ‘damping factor’ : 5e7 Hz collisional frequency for helium atoms nu_m = 2.3e9*P(He) (torr 300K) 5e7Hz corresponds to 0.02Torr

11 CONCLUSIONS For He2 in d3Σu+ state (>24 eV, radiative lifetime ~25 ns), damped oscillation in rotational temperature observed on top of the cooling. A combination of microplasma jet, supersonic expansion, and 2D spectra map enables a tool to study collisional dynamics of highly-excited dimers in motion.

Download ppt "COOLING OF ELECTRICALLY-EXCITED He2 IN A MICROCAVITY PLASMA JET"

Similar presentations

Anomalous Ion Heating Status and Research Plan

Anomalous Ion Heating Status and Research Plan
Photoexcitation and Ionization of Cold Helium Atoms R. Jung 1,2 S. Gerlach 1,2 G. von Oppen 1 U. Eichmann 1,2 1 Technical University of Berlin 2 Max-Born-Institute.

Photoexcitation and Ionization of Cold Helium Atoms R. Jung 1,2 S. Gerlach 1,2 G. von Oppen 1 U. Eichmann 1,2 1 Technical University of Berlin 2 Max-Born-Institute.
Particle’s Dynamics in Dusty Plasma with Gradients of Dust Charges

Particle’s Dynamics in Dusty Plasma with Gradients of Dust Charges
Molecular Bonds Molecular Spectra Molecules and Solids CHAPTER 10 Molecules and Solids Johannes Diderik van der Waals (1837 – 1923) “You little molecule!”

Molecular Bonds Molecular Spectra Molecules and Solids CHAPTER 10 Molecules and Solids Johannes Diderik van der Waals (1837 – 1923) “You little molecule!”
The Quantum Mechanics of Simple Systems

The Quantum Mechanics of Simple Systems
Nonequilibrium Thermodynamics Laboratories The Ohio State University OH Laser-Induced Fluorescence Measurements in Nanosecond Pulse Discharge Plasmas Inchul.

Nonequilibrium Thermodynamics Laboratories The Ohio State University OH Laser-Induced Fluorescence Measurements in Nanosecond Pulse Discharge Plasmas Inchul.
OPOLEOpole University Institute of Physics, Plasma Spectroscopy Group I am from.. 1.

OPOLEOpole University Institute of Physics, Plasma Spectroscopy Group I am from.. 1.
TEST GRAINS AS A NOVEL DIAGNOSTIC TOOL B.W. James, A.A. Samarian and W. Tsang School of Physics, University of Sydney NSW 2006, Australia

TEST GRAINS AS A NOVEL DIAGNOSTIC TOOL B.W. James, A.A. Samarian and W. Tsang School of Physics, University of Sydney NSW 2006, Australia
23 June 2009 Performance of a Continuous Supersonic Expansion Discharge Source Evaluated by Laser-Induced Fluorescence Spectroscopy.

23 June Performance of a Continuous Supersonic Expansion Discharge Source Evaluated by Laser-Induced Fluorescence Spectroscopy.
Phy100: Blackbody radiation

Phy100: Blackbody radiation
Generation of short pulses

Generation of short pulses
Physics at the end of XIX Century Major Discoveries of XX Century

Physics at the end of XIX Century Major Discoveries of XX Century
Finding FingerprintsXDAP 16|11|2004 FINDING FINGERPRINTS Probing the interaction between comets and the solar wind Dennis Bodewits Xander Tielens, Ronnie.

Finding FingerprintsXDAP 16|11|2004 FINDING FINGERPRINTS Probing the interaction between comets and the solar wind Dennis Bodewits Xander Tielens, Ronnie.
Spectroscopy. Atoms and Light  Atomic electron energy levels are a source of discrete photon energies.  Change from a high to low energy state produces.

Spectroscopy. Atoms and Light  Atomic electron energy levels are a source of discrete photon energies.  Change from a high to low energy state produces.
Ionization, Resonance excitation, fluorescence, and lasers The ground state of an atom is the state where all electrons are in the lowest available energy.

Ionization, Resonance excitation, fluorescence, and lasers The ground state of an atom is the state where all electrons are in the lowest available energy.
Laser Induced Fluorescence Structural information about the ground and excited states of molecules. Excitation experiments  Excited state information.

Laser Induced Fluorescence Structural information about the ground and excited states of molecules. Excitation experiments  Excited state information.
OPTIMIZATION OF O 2 ( 1  ) YIELDS IN PULSED RF FLOWING PLASMAS FOR CHEMICAL OXYGEN IODINE LASERS* Natalia Y. Babaeva, Ramesh Arakoni and Mark J. Kushner.

OPTIMIZATION OF O 2 ( 1  ) YIELDS IN PULSED RF FLOWING PLASMAS FOR CHEMICAL OXYGEN IODINE LASERS* Natalia Y. Babaeva, Ramesh Arakoni and Mark J. Kushner.
Photochemistry Lecture 1 Electronic excitation of atoms and molecules.

Photochemistry Lecture 1 Electronic excitation of atoms and molecules.
Fast imaging of global eigenmodes in the H-1 heliac ABSTRACT We report a study of coherent plasma instabilities in the H-1 plasma using a synchronous gated.

Fast imaging of global eigenmodes in the H-1 heliac ABSTRACT We report a study of coherent plasma instabilities in the H-1 plasma using a synchronous gated.
Laboratory for Optical Physics and Engineering CO + and C 2 Spectra Generated by CO 2 Atmospheric Pressure Glow Discharge in MicroChannels Chul Shin, Thomas.

Laboratory for Optical Physics and Engineering CO + and C 2 Spectra Generated by CO 2 Atmospheric Pressure Glow Discharge in MicroChannels Chul Shin, Thomas.

Similar presentations

Ads by Google