scholarly journals IR Photodecomposition of CH3COCF3

1988 ◽  
Vol 8 (2-4) ◽  
pp. 385-408 ◽  
Author(s):  
R. Fantoni ◽  
E. Borsella ◽  
S. Piccirillo ◽  
A. Giardini-Guidoni ◽  
R. Teghil
Keyword(s):  
Laser Radiation ◽  
Multichannel Analyzer ◽  
Laser Induced Breakdown ◽  
Secondary Reactions ◽  
Primary Fragmentation ◽  
Collisional Regime

IR multiple-photon decomposition of 1,1,1-trifluoroacetone has been achieved in bulk by irradiating molecules with 970.55 cm−1 laser radiation. In collisional regime the onset of laser induced breakdown has been observed. Primary fragmentation and subsequent ion and radical secondary reactions have been monitored detecting the spontaneous luminescence with a gateable Optical Multichannel Analyzer.

Scattering of incident KrF laser radiation resulting from the laser-induced breakdown of H_2O droplets

1989 ◽  
Vol 14 (11) ◽  
pp. 548 ◽  
Author(s):  
D. R. Alexander ◽  
S. A. Schaub ◽  
J. Zhang ◽  
D. E. Poulain ◽  
J. P. Barton
Keyword(s):  
Laser Radiation ◽  
Krf Laser ◽  
Laser Induced Breakdown

scholarly journals Thermalization in Infrared Multiple Photon Induced Reactions. The Pressure Dependence of the Trans → Cis Isomerization of Crotonitrile

1990 ◽  
Vol 10 (4) ◽  
pp. 227-238 ◽  
Author(s):  
Joseph R. Guckert ◽  
Robert W. Carr
Keyword(s):  
Laser Radiation ◽  
Pressure Dependence ◽  
Pressure Range ◽  
Laser Pulses ◽  
Low Pressure ◽  
Trans Form ◽  
Collisional Regime

The infrared multiple photon trans → cis isomerization of crotonitrile was studied over the pressure range 0.02 torr to 10 torr at fluences of approximately 4J/cm2 using collimated TEA CO2 laser radiation at 942 cm-1. Only minor quantifies of fragmentation products were found at these conditions. At pressures of 0.1 torr or less, the trans form was completely converted to cis form by about 5000 laser pulses. On increasing the pressure a collisional regime was entered in which photostationary states were reached with fewer pulses and having smaller conversions than at low pressure. Both the number of pulses and the conversion decreased monotonically with increasing pressure. The tactic of driving the reaction in the exothermic direction gave evidence that the reaction does not occur solely by thermal isomedzation even in the highly eollisional 10 torr experiments, but that it still has a nonthermal component due to laser induced isomerization.

scholarly journals Characteristics of laser induced breakdown investigated by a compact, nongated optical multichannel analyzer system and its potential application

Heliyon ◽  
2020 ◽  
Vol 6 (12) ◽  
pp. e05711
Author(s):  
Nasrullah Idris ◽  
Kurnia Lahna ◽  
Muliadi Ramli ◽  
Taufik Fuadi Abidin ◽  
Wahyu Setia Budi ◽  
...  
Keyword(s):  
Potential Application ◽  
Multichannel Analyzer ◽  
Laser Induced Breakdown

Nanosecond laser-induced breakdown assisted by femtosecond laser pre-ionization in air: the effect on spatial resolution and continuous radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20701
Author(s):  
Bo Li ◽  
Xiaofeng Li ◽  
Zhifeng Zhu ◽  
Qiang Gao
Keyword(s):  
Femtosecond Laser ◽  
Spatial Resolution ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Breakdown Threshold ◽  
Powerful Technique ◽  
Breakdown Spectroscopy ◽  
Continuous Radiation ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for quantitative diagnostics of gases. The spatial resolution of LIBS, however, is limited by the volume of plasma. Here femtosecond-nanosecond dual-pulsed LIBS was demonstrated. Using this method, the breakdown threshold was reduced by 80%, and decay of continuous radiation was shortened. In addition, the volume of the plasma was shrunk by 85% and hence, the spatial resolution of LIBS was significantly improved.

PHASE CONJUGATION OF KrF LASER RADIATION

1983 ◽  
Vol 44 (C2) ◽  
pp. C2-19-C2-25
Author(s):  
M. C. Gower ◽  
R. G. Caro
Keyword(s):  
Laser Radiation ◽  
Phase Conjugation ◽  
Krf Laser

HEATING OF CRYSTALLINE AND AMORPHOUS SILICON BY C-SWITCHED LASER RADIATION

1980 ◽  
Vol 41 (C4) ◽  
pp. C4-31-C4-36
Author(s):  
J. R. Meyer ◽  
F. J. Bartoli ◽  
M. R. Kruer
Keyword(s):  
Laser Radiation ◽  
Amorphous Silicon
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