Optical emission spectroscopy study of premixed C2H 4/O2 and C2H4/C2H 2/O2 flames for diamond growth with and without CO 2 laser excitation

X. N. He, T. Gebre, X. K. Shen, Z. Q. Xie, Y. S. Zhou, Y. F. Lu

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

Abstract

Optical emission spectroscopy (OES) measurements were carried out to study premixed C2H4/O2 and C2H 4/C2H2/O2 combustion flame for diamond deposition with and without a CO2 laser excitation. Strong emissions from radicals C2 and CH were observed in the visible range in all the OES spectra acquired. By adding a continuous-wave CO2 laser to irradiate the flame at a wavelength of 10.591 μm, the common CO 2 laser wavelength, it was discovered that the emission intensities of the C2 and CH radicals were increased due to the laser beam induced excitation. OES measurements of the C2 and CH radicals were performed using different gas combinations and laser powers. The rotational temperatures in the flame were determined by analyzing the spectra of the R-branch of the A2Δ→X2Π (0, 0) electronic transition near 430 nm (CH band head). Information obtained from the OES spectra, including the emission intensities of the C2 and CH radicals, the intensity ratios, and the rotational temperatures, was integrated into the study of diamond deposition on tungsten carbide substrates for mechanism analysis of the laser induced vibrational excitation and laser-assisted diamond deposition.

Original languageEnglish (US)
Title of host publicationLaser-based Micro- and Nanopackaging and Assembly IV
DOIs
StatePublished - 2010
EventLaser-based Micro- and Nanopackaging and Assembly IV - San Francisco, CA, United States
Duration: Jan 26 2010Jan 28 2010

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7585
ISSN (Print)0277-786X

Conference

ConferenceLaser-based Micro- and Nanopackaging and Assembly IV
CountryUnited States
CitySan Francisco, CA
Period1/26/101/28/10

Keywords

  • Diamond deposition
  • Optical emission spectroscopy
  • Rotational temperature
  • Vibrational excitation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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