scholarly journals Time resolved tunable diode laser absoption spectroscopy of dual High Power Impulse Magnetron Sputtering discharges

2014 ◽  
Vol 32 ◽  
pp. 1460337
Author(s):  
Hoang Tung Do ◽  
Vitezslav Stranak ◽  
Rainer Hippler
Keyword(s):  
Magnetron Sputtering ◽  
Diode Laser ◽  
High Power ◽  
Field Configuration ◽  
Tunable Diode Laser ◽  
Buffer Gas ◽  
Time Resolved ◽  
Laser Absorption ◽  
Metal Atoms ◽  
Diode Laser Absorption

Time-resolved measurements have been performed during dual High Power Impulse Magnetron Sputtering (dual-HiPIMS) with two cathodes in a closed magnetic field configuration. The dual-HiPIMS system, operated at a repetition frequency f = 100 Hz and duty cycle of 1 %, was equipped with two different metallic targets (Ti, Cu). The effect of a delay between subsequent pulses on argon excited atom density and temperature was investigated by means of tunable diode laser absorption spectroscopy. It is shown that the peak densities of pulses vary strongly with the delay. We observed an enhancement of metastable density due to pre-ionization effect but more effective than that is the contribution of metal atoms which have smaller ionization energy compare to that of buffer gas atom. Associate with the enhancement of density, the temporal variation of metastable atom temperature in the Cu pulse also transforms from those of low current pulse into the high current one.

Time-resolved tunable diode laser absorption spectroscopy of pulsed plasma

2013 ◽  
Vol 38 (14) ◽  
pp. 2428 ◽  
Author(s):  
P. Adámek ◽  
J. Olejníček ◽  
M. Čada ◽  
Š. Kment ◽  
Z. Hubička
Keyword(s):  
Diode Laser ◽  
Absorption Spectroscopy ◽  
Tunable Diode Laser ◽  
Pulsed Plasma ◽  
Laser Absorption Spectroscopy ◽  
Time Resolved ◽  
Laser Absorption ◽  
Diode Laser Absorption

Studies of Pyrolysis Products of Explosives in Soils using Infrared Tunable Diode Laser Detection

1995 ◽  
Vol 418 ◽  
Author(s):  
J. Wormhoudt ◽  
J. H. Shorter ◽  
C. E. Kolb
Keyword(s):  
Diode Laser ◽  
Tunable Diode Laser ◽  
Laboratory Studies ◽  
Decomposition Products ◽  
Pyrolysis Products ◽  
Time Resolved ◽  
Laser Absorption ◽  
Hot Filament ◽  
Diode Laser Absorption ◽  
Initial Results

AbstractWe report on laboratory studies of the thermal decomposition of TNT under a variety of conditions. Our goal is a better understanding of the soil contamination detection technique used in site characterization using cone penetrometers, in which hot filament pyrolysis results in small gaseous molecules, such as NO, which can be detected by a variety of methods to indicate the presence of explosives in the soil. Our laboratory studies use a long-path sampling cell and tunable infrared diode laser absorption, which provide sensitive, specific, time-resolved detection of several of the key decomposition products. In this paper, we present both the initial results of laboratory experiments on mixtures of soil and TNT, designed to simulate the operation of a cone penetrometer probe, and also results of a series of heated tube experiments which serve to relate the first type of experiment to previously reported TNT decomposition studies.

scholarly journals Time Resolved TDLAS Investigation of Pre-ionization Effect in Dual HiPIMS Discharges

2014 ◽  
Vol 24 (3S2) ◽  
Author(s):  
Nguyen Van Tan ◽  
Do Hoang Tung ◽  
Rainer Hipler
Keyword(s):  
Excited Atom ◽  
Field Configuration ◽  
Tunable Diode Laser ◽  
Minor Role ◽  
Post Discharge ◽  
Time Resolved ◽  
Peak Density ◽  
Laser Absorption ◽  
Ionization Effect ◽  
Diode Laser Absorption

Time-resolved measurements have been performed during dual High Power Impulse Magnetron Sputtering (dual-HiPIMS) with two cathodes in a closed magnetic field configuration. The dual-HiPIMS system, operated at a repetition frequency f = 100 Hz and duty cycle of 1\%, was equipped with two different metallic targets (Ti, Cu). Pre-ionization effect of the Ti pulse on the Cu pulse was investigated through argon excited atom density and temperature by means of tunable diode laser absorption spectroscopy. We observed an enhancement of metastable density due to pre-ionization effect. It is shown that the peak density in the Cu pulse increases about 30\% for the case of 15$\mu $s delay then decrease as the delay was prolonged. The effect displays even stronger in the peak density in the afterglow, as well as in the atom temperature behavior. Although metastable atoms are abundantly available in post-discharge, they play minor role in the ignition of the subsequence pulse.

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