A neutral strongly coupled laser-produced plasma by strong-field ionization in a gas jet

Bergeson, Scott; Lyon, Mary; Peatross, Justin; Harrison, Nicholas M.; Crunkleton, D.; Wilson, J.; Rupper, Stephen; Diaw, Abdourahmane; Murillo, M. S.

doi:10.1063/1.4923114

Cited by 2 publications

(3 citation statements)

References 38 publications

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“…It is important to study various plasmas generated by different experimental techniques as well as their characterization by developing a suitable plasma model to obtain the plasma parameters viz electron temperature (T e ) and density (n e ) [1][2][3][4][5][6][7][8][9][10][11][12]. However, such a study has not focused on laser produced plasma in a detailed manner.…”

Section: Introductionmentioning

confidence: 99%

Modeling of laser produced Zn plasma with detailed electron impact fine structure excitation cross-sections

Gupta

Gangwar

Srivastava

2019

Plasma Sources Sci. Technol.

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An intricate collisional radiative (CR) model is developed including all the important processes for the laser induced zinc plasma. The electron impact excitation (EIE) and de-excitation of several fine structure levels of Zn play a dominant role in the laser induced plasma and their cross-sections are needed. In view of this, an extensive calculation is performed to obtain the EIE cross-sections of the large number of fine structure transitions of zinc atom. The cross-sections of Zn are calculated and presented for the excitations from its ground state 4s 2 (J=0) as well as from the 4s4p excited state to the various fine structure levels of different excited states using fully relativistic distorted wave (RDW) theory. In the calculation, relativistic multi-configuration bound target atomic wave functions are obtained through GRASP2K program using 4s 2 , 4s4p, 4s5s, 4s5p, 4s4d, 4s6s, 4s6p, 4s5d, 4s7s and 4s7p configuration state functions while the projectile incident and scattered electron distorted wave functions are obtained by solving the relativistic Dirac equations. Further, the calculated cross-sections are incorporated in the CR model for the plasma characterization as the various rate coefficients are linked through their corresponding cross-sections. The model gives the state population distribution of the fine structure energy levels of the neutral Zn atom considered in the model and from which the intensities of the line emissions are obtained. The calculated intensities from the CR model for the four emission lines (334.5, 468, 472, and 481 nm) are matched with the spectroscopic measurements (Smijesh et al 2013 J. Appl. Phys. 114 093301) and the plasma parameters viz electron density n e ( ) and electron temperature T e ( ) are evaluated. The plasma parameters are presented at different ambient pressures in the range of 0.05-10 Torr.

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Section: Introductionmentioning

confidence: 99%

Modeling of laser produced Zn plasma with detailed electron impact fine structure excitation cross-sections

Gupta

Gangwar

Srivastava

2019

Plasma Sources Sci. Technol.

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“…In these instances, we expect DIH to be an important source of fast gas heating. In laser-produced plasmas, DIH is the fastest known heating mechanism present and therefore sets the ion temperature at early times [25]. In nanosecond discharges, neutral gas heating predicted by DIH has shown very good agreement with timeresolved gas measurements from experimental work [28], giving further merit to the importance of this process.…”

Section: Introductionmentioning

confidence: 82%

“…While many atmospheric pressure plasmas do not reach high enough levels of ionization for DIH to be significant, those generated from nanosecond discharges, arc discharges, and laser ionization often do [21][22][23][24][25][26][27]. In these instances, we expect DIH to be an important source of fast gas heating.…”

Section: Introductionmentioning

confidence: 99%

Disorder-induced heating in molecular atmospheric pressure plasmas

LeVan,

Acciarri,

Baalrud

2024

Plasma Sources Sci. Technol.

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Recent work has shown that ions are strongly coupled in atmospheric pressure plasmas when the ionization fraction is sufficiently large, leading to a temperature increase from disorder-induced heating that is not accounted for in standard modelling techniques. Here, we extend this study to molecular plasmas. A main finding is that the energy gained by ions in disorder-induced heating gets spread over both translational and rotational degrees of freedom on a nanosecond timescale, causing the final ion and neutral gas temperatures to be lower in the molecular case than in the atomic case. A model is developed for the equilibrium temperature that agrees well with molecular dynamics simulations. The model and simulations are also applied to pressures up to ten atmospheres. We conclude that disorder-induced heating is a significant and predictable phenomena in molecular atmospheric pressure plasmas.

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A neutral strongly coupled laser-produced plasma by strong-field ionization in a gas jet

Cited by 2 publications

References 38 publications

Modeling of laser produced Zn plasma with detailed electron impact fine structure excitation cross-sections

Modeling of laser produced Zn plasma with detailed electron impact fine structure excitation cross-sections

Disorder-induced heating in molecular atmospheric pressure plasmas

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