Influence of laser vibrational excitations of ethylene molecules in laser-assisted combustion diamond synthesis

L. S. Fan, Y. S. Zhou, M. X. Wang, Y. Gao, L. Liu, J. F. Silvainu, Y. F. Lu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Laser-induced vibrational excitation of ethylene molecules was integrated to the CVD diamond deposition process for an in-depth understanding of the energy coupling path in chemical reactions and an alternative method to enhance the diamond deposition. On- And off- resonance excitations of ethylene molecules were achieved via tuning the incident laser wavelengths centered at 10.532 |im. With the same amount of laser power absorbed, the chemical reaction is highly accelerated with on-resonance vibrational excitation whereas energy coupling with off-resonance excitations was less efficient in influencing the combustion process. The diamond deposition rate was enhanced by a factor of 5.7 accompanied with an improvement of diamond quality index with the on-resonance excitation at 10.532 |im. The measured flame temperature demonstrated that the resonant vibrational excitation was an efficient route for coupling energy into the reactant molecules and steering the combustion process.

Original languageEnglish (US)
Title of host publicationDiamond Electronics and Biotechnology - Fundamentals to Applications
EditorsD. A. J. Moran, G. M. Swain, C.-L. Cheng, R. J. Nemanich
PublisherMaterials Research Society
Pages1-6
Number of pages6
ISBN (Electronic)9781510806153
DOIs
StatePublished - 2015
Event2014 MRS Fall Meeting - Boston, United States
Duration: Nov 30 2014Dec 5 2014

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1734
ISSN (Print)0272-9172

Other

Other2014 MRS Fall Meeting
CountryUnited States
CityBoston
Period11/30/1412/5/14

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Fan, L. S., Zhou, Y. S., Wang, M. X., Gao, Y., Liu, L., Silvainu, J. F., & Lu, Y. F. (2015). Influence of laser vibrational excitations of ethylene molecules in laser-assisted combustion diamond synthesis. In D. A. J. Moran, G. M. Swain, C-L. Cheng, & R. J. Nemanich (Eds.), Diamond Electronics and Biotechnology - Fundamentals to Applications (pp. 1-6). (Materials Research Society Symposium Proceedings; Vol. 1734). Materials Research Society. https://doi.org/10.1557/opl.2015.6