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

Cheng Hsiang Lin, Zhi Liang, Jun Zhou, Hai Lung Tsai

Research output: Contribution to journalArticle

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 N 2-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.

Original languageEnglish (US)
Pages (from-to)119-123
Number of pages5
JournalApplied Physics A: Materials Science and Processing
Volume116
Issue number1
DOIs
StatePublished - Jan 1 2014

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Lasers
Laser tuning
Ultrashort pulses
Excited states
Chemical reactions
Time delay
Wavelength
Substrates

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

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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 N 2-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.",
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Radical species generation and their lifetime extension by a femtosecond and nanosecond dual-laser system. / Lin, Cheng Hsiang; Liang, Zhi; Zhou, Jun; Tsai, Hai Lung.

In: Applied Physics A: Materials Science and Processing, Vol. 116, No. 1, 01.01.2014, p. 119-123.

Research output: Contribution to journalArticle

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