NDLI: Radical species generation and their lifetime extension by a femtosecond and nanosecond dual-laser system

Content Provider	SpringerLink
Author	Lin, Cheng Hsiang Liang, Zhi Zhou, Jun Tsai, Hai Lung
Copyright Year	2014
Abstract	For many material processes, desired radical species at excited states are produced which interact with a given substrate for a certain period of time allowing chemical reactions between them to occur and complete. Hence, it is important to maintain the population of the excited radical species for an extended period of time, i.e., their lifetime, which is defined as the time for emission intensity to decay to 1/e of the initial intensity. In this study, a femtosecond–nanosecond (fs–ns) dual-laser system was employed to generate desired radical species via the fs laser and, then, to extend the lifetime of the radical species by the ns laser with different time delays between the two fs–ns laser pulses. The proposed method is demonstrated for a N2–CO2 mixture with CN as the radical species. The results show that the lifetime of CN radical species can be significantly extended, particularly the (3, 3) spectral line which was extended from 30 to 200 ns. By using a wavelength-tunable ns laser, the lifetime of most radical species can be extended which may increase the process efficiency for many material processes.
Starting Page	119
Ending Page	123
Page Count	5
File Format	PDF
ISSN	09478396
Journal	Applied Physics A
Volume Number	116
Issue Number	1
e-ISSN	14320630
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-01-19
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Condensed Matter Physics Optical and Electronic Materials Nanotechnology Characterization and Evaluation of Materials Surfaces and Interfaces, Thin Films Operating Procedures, Materials Treatment
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Science

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