Laserspektroskopische Untersuchungen an nicht-stabilisierten N2(B3IIg, ν; = 13)-Molekülen / Laser Spectroscopic Studies on Non-stabilized N2(B3IIg, ν; = 13) molecules

1976 ◽  
Vol 31 (6) ◽  
pp. 673-674
Author(s):  
K. H. Becker ◽  
H. Engels ◽  
T. Tatarczyk
Keyword(s):  
Detection Limit ◽  
Emission Spectroscopy ◽  
Spectroscopic Studies ◽  
Rotational Analysis ◽  
Tunable Dye Laser ◽  
Recombination Processes ◽  
Three Body ◽  
Laser Spectroscopic ◽  
Body Recombination ◽  
Better Than

Unstabilized N2(B3IIg, ν = 13) quasi-molecules were analysed by excitation with a tunable dye-laser into the N2(C3IIu) state and observation of the following fluorescence to N2(B3IIg, ν) levels. The quasi-molecules are in equilibrium with the free nitrogen atoms. The detection limit of this technique is 105 molecules/cm3. By the same method, a rotational analysis of molecules stabilized into (B3IIg, ν ≦ 12) levels by three-body recombination processes was achieved with a resolution better than that reached by emission spectroscopy of the Lewis-Rayleigh afterglow

scholarly journals Atomic-state-dependent screening model for hot and warm dense plasmas

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Fuyang Zhou ◽  
Yizhi Qu ◽  
Junwen Gao ◽  
Yulong Ma ◽  
Yong Wu ◽  
...  
Keyword(s):  
Radiation Transport ◽  
Atomic State ◽  
Many Body ◽  
Dense Plasmas ◽  
Screening Model ◽  
State Dependent ◽  
Recombination Processes ◽  
Three Body ◽  
Many Body Interactions ◽  
Body Recombination

AbstractAn ion embedded in warm/hot dense plasmas will greatly alter its microscopic structure and dynamics, as well as the macroscopic radiation transport properties of the plasmas, due to complicated many-body interactions with surrounding particles. Accurate theoretically modeling of such kind of quantum many-body interactions is essential but very challenging. In this work, we propose an atomic-state-dependent screening model for treating the plasmas with a wide range of temperatures and densities, in which the contributions of three-body recombination processes are included. We show that the electron distributions around an ion are strongly correlated with the ionic state studied due to the contributions of three-body recombination processes. The feasibility and validation of the proposed model are demonstrated by reproducing the experimental result of the line-shift of hot-dense plasmas as well as the classical molecular dynamic simulations of moderately coupled ultra-cold neutral plasmas. Our work opens a promising way to treat the screening effect of hot and warm dense plasma, which is a bottleneck of those extensive studies in high-energy-density physics, such as atomic processes in plasma, plasma spectra and radiation transport properties, among others.

Temporal Spectra Behavior in Femtosecond LIBS of Marine Water

2014 ◽  
Vol 644-650 ◽  
pp. 1443-1447
Author(s):  
Alexey Ilyin ◽  
Sergey Golik ◽  
Yuliya Biryukova ◽  
Michael Babiy ◽  
Dmitrii Apeksimov
Keyword(s):  
Detection Limit ◽  
Femtosecond Laser ◽  
Decay Time ◽  
Line Intensity ◽  
Water Surface ◽  
Sea Water ◽  
Recombination Coefficient ◽  
Femtosecond Laser Plasma ◽  
Three Body ◽  
Body Recombination

Spectral dynamics of femtosecond laser plasma induced on the sea water surface is investigated. Characteristic decay time of continuum and line intensity of Mg II, Ca II and Na I are determined. Electron density that changes from 3.0·1016to 2.4·1015cm-3was provided by usage of three-body recombination coefficient. It is shown that Na detection limit will be least in comparison with Mg and Ca.

scholarly journals Two- and Three-body Ion-Electron Recombination Rate Coefficients in Neon

1995 ◽  
Vol 48 (3) ◽  
pp. 503 ◽  
Author(s):  
RN Bhave ◽  
R Cooper
Keyword(s):  
Recombination Rate ◽  
Rate Coefficient ◽  
Rate Coefficients ◽  
Electron Recombination ◽  
Wide Range ◽  
Recombination Processes ◽  
Three Body ◽  
Modified Theory ◽  
Body Recombination ◽  
Monatomic Gas

The rates of recombination of electrons with Net ions over a wide range of pressure (1001000 Torr) and at temperatures of 133, 233 and 295 K were measured. Two- and three-body recombination processes were resolved. The observed two-body rate coefficient is lower than earlier reports. The three-body rate measured agrees well with predictions from Flarinery's modified theory by Bates for termolecular ion-electron recombination in a monatomic gas.

scholarly journals Study of optical emission from laser-produced plasma expanding across an external magnetic field

2003 ◽  
Vol 21 (1) ◽  
pp. 65-71 ◽  
Author(s):  
VIRENDRA N. RAI ◽  
JAGDISH P. SINGH ◽  
FANG Y. YUEH ◽  
ROBERT L. COOK
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Emission Spectroscopy ◽  
Line Emission ◽  
Optical Emission ◽  
Atomic Emission ◽  
Laser Induced Plasma ◽  
Steady Magnetic Field ◽  
Three Body ◽  
Body Recombination

The laser-induced plasma obtained from the liquid target and expanding across a steady magnetic field has been studied using atomic emission spectroscopy. The line emission from the plasma was enhanced (>1.5 times) in the presence of a magnetic field, whereas background emission decreases. Enhancement in line intensity was found to be mainly a function of plasma beta (β). An increased rate of three-body recombination in plasma particles due to the cooling of the plasma during its expansion and an increase in effective plasma density as a result of its confinement seems to be the reason behind this enhancement.

scholarly journals Three-body recombination calculations with a two-body mapped grid method

2021 ◽  
Vol 103 (3) ◽  
Author(s):  
T. Secker ◽  
J.-L. Li ◽  
P. M. A. Mestrom ◽  
S. J. J. M. F. Kokkelmans
Keyword(s):  
Grid Method ◽  
Three Body ◽  
Body Recombination

Dosage du Sr-90 dans l'eau des lacs et des rivières du Québec par précipitation avec l'oxine et comptage β

1988 ◽  
Vol 66 (1) ◽  
pp. 174-177 ◽  
Author(s):  
E. Haddad ◽  
L. Zikovsky
Keyword(s):  
Detection Limit ◽  
Surface Waters ◽  
New Method ◽  
The Mean ◽  
Better Than

A new method for the determination of Sr-90 dissolved in surface waters has been developed. It is based on the precipitation of Sr with 8-hydroxyquinoline at pH 11.3 and counting of β particles with energy above 150 keV. The detection limit obtained is 0.5 mBq/L and the mean yield is 28%. The decontamination factors from other β emitters achieved are better than 10 000. This method has been used to measure the Sr-90 in 5 lakes and 5 rivers in Québec and activities ranging from 3 to 15 mBq/L were obtained. This new method is as efficient and reliable as conventional techniques while being less tedious.

Detailed dynamics of three-body recombination of ions in central collisions

2012 ◽  
Vol 392 (1) ◽  
pp. 149-159 ◽  
Author(s):  
Dmitrii B. Kabanov ◽  
Lev Yu. Rusin
Keyword(s):  
Central Collisions ◽  
Three Body ◽  
Body Recombination
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