Mechanism of the ultraviolet laser ablation of polymethyl methacrylate at 193 and 248 nm: laser-induced fluorescence analysis, chemical analysis, and doping studies

1986 ◽  
Vol 3 (5) ◽  
pp. 785 ◽  
Author(s):  
R. Srinivasan ◽  
B. Braren ◽  
R. W. Dreyfus ◽  
L. Hadel ◽  
D. E. Seeger
Keyword(s):  
Laser Ablation ◽  
Chemical Analysis ◽  
Polymethyl Methacrylate ◽  
Fluorescence Analysis ◽  
Laser Induced Fluorescence ◽  
Ultraviolet Laser

Nature of ‘‘incubation pulses’’ in the ultraviolet laser ablation of polymethyl methacrylate

1990 ◽  
Vol 68 (4) ◽  
pp. 1842-1847 ◽  
Author(s):  
R. Srinivasan ◽  
Bodil Braren ◽  
Kelly G. Casey
Keyword(s):  
Laser Ablation ◽  
Polymethyl Methacrylate ◽  
Ultraviolet Laser

Ultraviolet Laser Ablation of a Silicon Wafer

1988 ◽  
Vol 129 ◽  
Author(s):  
Masahiro Kawasaki ◽  
Hiroyasu Sato ◽  
Gen Inoue
Keyword(s):  
Theoretical Model ◽  
Laser Ablation ◽  
Laser Irradiation ◽  
Pulsed Laser ◽  
Fluorescence Analysis ◽  
Laser Induced Fluorescence ◽  
Wafer Surface ◽  
Translational Energy ◽  
Si Wafer ◽  
Pulsed Laser Irradiation

Pulsed laser irradiation at 248 nm can ablate Si atoms from an Si wafer. The mechanism of this photoablation has been examined by laser-induced fluorescence analysis of the Si products. The Si atoms are measured to leave the wafer surface with averaged translational energy of 2.5 kcal/mol. The distribution of translational energy is well described by the theoretical model for non-cascade ablation processes.

Hollowing and Transfer of Polymethyl Methacrylate Film Propelled by Laser Ablation of Triazeno Polymer Film

2001 ◽  
Vol 40 (Part 2, No. 8A) ◽  
pp. L805-L806 ◽  
Author(s):  
Takashi Mito ◽  
Takuji Tsujita ◽  
Hiroshi Masuhara ◽  
Nobuaki Hayashi ◽  
Kenkichi Suzuki
Keyword(s):  
Laser Ablation ◽  
Polymer Film ◽  
Polymethyl Methacrylate

scholarly journals Direct Chemical Analysis of Solids by Laser Ablation in an Ion Storage Time-of-Flight Mass Spectrometer

2004 ◽  
Vol 76 (5) ◽  
pp. 1249-1256 ◽  
Author(s):  
Gregory L. Klunder ◽  
Patrick M. Grant ◽  
Brian D. Andresen ◽  
Richard E. Russo
Keyword(s):  
Laser Ablation ◽  
Chemical Analysis ◽  
Mass Spectrometer ◽  
Storage Time ◽  
Time Of Flight ◽  
Flight Mass Spectrometer ◽  
Ion Storage

Photoablation Studies of Polymers, Quartz, and Semiconductors with Vacuum Ultraviolet Laser Radiation

1991 ◽  
Vol 236 ◽  
Author(s):  
Peter R. Herman ◽  
Boyi Chen ◽  
David J. Moore ◽  
Mark Canaga-Retnam
Keyword(s):  
Laser Radiation ◽  
Polymethyl Methacrylate ◽  
Thermal Damage ◽  
Vacuum Ultraviolet ◽  
Medical Industry ◽  
Surface Melting ◽  
Excimer Lasers ◽  
Ultraviolet Laser ◽  
Low Threshold ◽  
Microelectronics Industry

AbstractExcimer lasers sources of 193nm and 157 nm wavelength were used to obtain new photoablation etching rates for several materials of interest to the microelectronics industry. The harder 157nm radiation provided lower ablation rates and smaller threshold fluences for Polyimide and Polymethyl Methacrylate (PMMA) than with 193nm. For normally robust materials like quartz and Teflon (PTFE), the 157nm laser produced clean and smooth ablation sites with low threshold fluences of 620mJ/cm2 and 68mJ/cm2, respectively, features impossible to obtain with conventional excimer lasers at longer wavelengths. The data should help define new micromachining applications of these two materials for the electronic, optical or medical industry. Results are also reported for GaAs and InP based materials which are found to undergo moderate etch rates of 30-80nm/pulse at fluences of ∼3J/cm2, but suffer thermal damage and material segregation due to surface melting.

scholarly journals PHARMACOGNOSTICAL AND PRELIMINARY PHYTOCHEMICAL SCREENING OF THE LEAVES OF KEDROSTIS FOETIDISSIMA (JACQ.)COGN.

2014 ◽  
Vol 1 (2) ◽  
pp. 112-115
Author(s):  
Thenmozhi K ◽  
Karthika K ◽  
Manian S
Keyword(s):  
Chemical Analysis ◽  
Fluorescence Analysis ◽  
Phytochemical Screening ◽  
Preliminary Screening ◽  
Chemical Reagents ◽  
Physico Chemical ◽  
The Family ◽  
Leaf Powder ◽  
Medicinal Properties ◽  
Phytochemical Extraction

The objective of the study is to cover the pharmacognostical and preliminary phytochemical screening of traditional medicinal plant, Kedrostis foetidissima belonging to the family Cucurbitaceae. This study includes organoleptic characters, physico-chemical analysis, fluorescence analysis, behaviour of leaf powder with different chemical reagents, phytochemical extraction, extractive yield and qualitative phytochemical screening. The preliminary screening revealed the presence of alkaloids, flavonoids, steroids, tannins, phenolics, glycosides, carbohydrates, proteins and aminoacids which explains that the plant must have valuable medicinal properties and so it can be explored

Capillary electrophoresis-laser induced fluorescence analysis of endogenous damage in mitochondrial and genomic DNA

2005 ◽  
Vol 26 (13) ◽  
pp. 2599-2607 ◽  
Author(s):  
Michaela Wirtz ◽  
Claus A. Schumann ◽  
Marc Schellenträger ◽  
Siegmar Gäb ◽  
Jochen vom Brocke ◽  
...  
Keyword(s):  
Capillary Electrophoresis ◽  
Genomic Dna ◽  
Fluorescence Analysis ◽  
Laser Induced Fluorescence
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