Raman Study of Kinetics of Graphitization of Carbon Blacks

2000 ◽  
Vol 73 (2) ◽  
pp. 284-292 ◽  
Author(s):  
T. Waldek Zerda ◽  
Tyler Gruber
Keyword(s):  
Laser Heating ◽  
Continuous Wave ◽  
Fast Rate ◽  
Pulsed Laser ◽  
Reaction Rates ◽  
Carbon Blacks ◽  
Raman Study ◽  
Laser Heated ◽  
Pulsed Laser Heating ◽  
Kinetics Of

Abstract Raman spectra of laser heated carbon blacks provide information on the dynamics of the graphitization process. Continuous wave and pulsed-laser heating is used. It is shown that two ordering mechanisms of distinctly different reaction rates are present during the heat treatment. The dominating mechanism, during the initial stages of graphitization, is characterized by a very fast rate. The rate during the later stages of the process, after the initial first couple of seconds, is orders of magnitude slower.

Vaporization Kinetics During Pulsed Laser Heating of Liquid Hg

1999 ◽  
Vol 122 (2) ◽  
pp. 345-350 ◽  
Author(s):  
T. D. Bennett ◽  
M. Farrelly
Keyword(s):  
Energy Distribution ◽  
Laser Heating ◽  
Smooth Surface ◽  
Pulsed Laser ◽  
Thermal Conditions ◽  
Nanosecond Laser ◽  
Electromagnetic Excitation ◽  
Light Coupling ◽  
Pulsed Laser Heating ◽  
Kinetics Of

There is a growing body of experimental evidence showing that the kinetics of nascent vapor produced during pulsed laser heating of metals cannot always be ascribed to the surface thermal conditions. Some investigators have proposed that the discharge of energetic (nonthermal) atoms from metals can involve light coupling to surface plasmons. This requires surface roughness to facilitate wave vector matching of laser light with surface electromagnetic excitation modes. If true, superthermal vaporization kinetics should disappear from time-of-flight measurements when an optically smooth surface is used. Unfortunately, maintaining such an ideal surface is infeasible on a solid target because each laser pulse introduces nanometer sized roughness through the process of melting and resolidification. We have investigated the nature of vaporization from a liquid Hg surface using a nanosecond laser emitting 5 eV photons. Surface tension of the liquid provides an optically smooth surface for this experiment. Nevertheless, we observe superthermal vaporization kinetics from liquid Hg. Yet, the shape of the energy distribution is Boltzmann (the thermal expectation), and the energy distribution does not demonstrate any quanta characteristic of vaporization mediated by an electronic excitation. [S0022-1481(00)01602-9]

Pulsed laser heating of soot: morphological changes

Carbon ◽  
1999 ◽  
Vol 37 (2) ◽  
pp. 231-239 ◽  
Author(s):  
Randy L Vander Wal ◽  
Mun Y Choi
Keyword(s):  
Laser Heating ◽  
Morphological Changes ◽  
Pulsed Laser ◽  
Pulsed Laser Heating

Thermal Modeling of the Cavity in Pulsed Excimer Laser Calorimeters

2000 ◽  
Author(s):  
D. H. Chen ◽  
Z. M. Zhang
Keyword(s):  
Laser Heating ◽  
Average Power ◽  
Pulsed Laser ◽  
Thermal Response ◽  
Element Model ◽  
Electrical Heating ◽  
Deep Ultraviolet ◽  
Simplified Finite Element Model ◽  
193 Nm ◽  
Pulsed Laser Heating

Abstract A simplified finite element model is built to study the thermal response of the 193-nm pulsed-laser calorimeter. The nonequivalence between pulsed-laser heating and electrical heating is estimated to be 0.46% at the thermocouple locations by comparing the calibration factors for average-power laser heating and electrical heating. This study should help the development of calibration and measurement standards in pulsed energy measurements for deep ultraviolet excimer lasers that are important for photolithographic and materials processing applications.

Effect of pulsed laser heating on the magnetic properties of the amorphous alloy Fe76Si13B11

2009 ◽  
Vol 108 (2) ◽  
pp. 125-130 ◽  
Author(s):  
V. V. Girzhon ◽  
A. V. Smolyakov ◽  
N. G. Babich ◽  
M. P. Semen’ko
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloy ◽  
Laser Heating ◽  
Pulsed Laser ◽  
Pulsed Laser Heating

A Computer Model for Pulsed Laser Heating of Device Structures

1981 ◽  
Vol 128 (8) ◽  
pp. 1798-1803 ◽  
Author(s):  
D. J. Godfrey ◽  
A. C. Hill ◽  
C. Hill
Keyword(s):  
Computer Model ◽  
Laser Heating ◽  
Pulsed Laser ◽  
Device Structures ◽  
Pulsed Laser Heating

Molecular dynamics study of lubricant depletion by pulsed laser heating

2018 ◽  
Vol 440 ◽  
pp. 73-83 ◽  
Author(s):  
Young Woo Seo ◽  
Andreas Rosenkranz ◽  
Frank E. Talke
Keyword(s):  
Molecular Dynamics ◽  
Laser Heating ◽  
Pulsed Laser ◽  
Lubricant Depletion ◽  
Pulsed Laser Heating

Investigation of Polymer Matrix Nano‐Aluminum Composites with Pulsed Laser Heating by In‐Situ TEM

2019 ◽  
Vol 44 (12) ◽  
pp. 1608-1612
Author(s):  
Tugba Isik ◽  
Xiaohui Xu ◽  
Steven F. Son ◽  
I. Emre Gunduz ◽  
Volkan Ortalan
Keyword(s):  
Polymer Matrix ◽  
Laser Heating ◽  
Pulsed Laser ◽  
In Situ Tem ◽  
Aluminum Composites ◽  
Pulsed Laser Heating
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