C2 and CH rotational temperatures in diamond growth using CO2 laser-assisted combustion-flames

T. Gebre, J. Sun, H. Ling, Y. X. Han, M. Zao, Y. F. Lu

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

1 Citation (Scopus)

Abstract

Excited C2 and CH species occur abundantly in diamond growth using C2H2/O2, C2H 2/C2H4/O2 and C2H 4/O2 flames. The irradiation of some flames by a continuous-wave (CW) CO2 laser beam has resulted in increased optical emission intensity from the excited species and a change in the physical appearance of the flames due to resonant absorption of laser energy. Gas temperature in the flames is one of the most important parameters in the application of diamond growth. In atmospheric plasmas, the gas kinetic temperature is closely related to the rotational temperature of radical species in the plasmas. Optical emission spectroscopy (OES) was used to obtain molecular spectra of the excited C2 and CH species in the flames for a fixed gas ratio of C2H2/C2H4/O2 flame at several laser energies. The rotational temperatures of CH were calculated using the Boltzmann plot method. In addition, synthetic C2 molecular spectra were compared with the experimental spectra to obtain temperature by the intensity ratio of selected spectrum components. For each condition, the temperatures obtained using these methods were correlated with the quality, grain size, and growth speed of diamond films on cemented tungsten carbide (WC-Co) substrates. rotational temperature, CO2 laser, resonant absorption,.

Original languageEnglish (US)
Title of host publicationLaser-based Micro- and Nanopackaging and Assembly II
DOIs
StatePublished - Mar 31 2008
EventLaser-based Micro- and Nanopackaging and Assembly II - San Jose, CA, United States
Duration: Jan 22 2008Jan 24 2008

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume6880
ISSN (Print)0277-786X

Conference

ConferenceLaser-based Micro- and Nanopackaging and Assembly II
CountryUnited States
CitySan Jose, CA
Period1/22/081/24/08

Fingerprint

flames
Diamonds
diamonds
methylidyne
Lasers
lasers
molecular spectra
Temperature
temperature
tungsten carbides
Kinetic theory of gases
Plasmas
continuous wave lasers
optical emission spectroscopy
Optical emission spectroscopy
gas temperature
Continuous wave lasers
diamond films
Tungsten carbide
gases

Keywords

  • Boltzmann plot
  • Diamond-film growth

ASJC Scopus subject areas

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

Cite this

Gebre, T., Sun, J., Ling, H., Han, Y. X., Zao, M., & Lu, Y. F. (2008). C2 and CH rotational temperatures in diamond growth using CO2 laser-assisted combustion-flames. In Laser-based Micro- and Nanopackaging and Assembly II [68800O] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6880). https://doi.org/10.1117/12.762168

C2 and CH rotational temperatures in diamond growth using CO2 laser-assisted combustion-flames. / Gebre, T.; Sun, J.; Ling, H.; Han, Y. X.; Zao, M.; Lu, Y. F.

Laser-based Micro- and Nanopackaging and Assembly II. 2008. 68800O (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6880).

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

Gebre, T, Sun, J, Ling, H, Han, YX, Zao, M & Lu, YF 2008, C2 and CH rotational temperatures in diamond growth using CO2 laser-assisted combustion-flames. in Laser-based Micro- and Nanopackaging and Assembly II., 68800O, Proceedings of SPIE - The International Society for Optical Engineering, vol. 6880, Laser-based Micro- and Nanopackaging and Assembly II, San Jose, CA, United States, 1/22/08. https://doi.org/10.1117/12.762168
Gebre T, Sun J, Ling H, Han YX, Zao M, Lu YF. C2 and CH rotational temperatures in diamond growth using CO2 laser-assisted combustion-flames. In Laser-based Micro- and Nanopackaging and Assembly II. 2008. 68800O. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.762168
Gebre, T. ; Sun, J. ; Ling, H. ; Han, Y. X. ; Zao, M. ; Lu, Y. F. / C2 and CH rotational temperatures in diamond growth using CO2 laser-assisted combustion-flames. Laser-based Micro- and Nanopackaging and Assembly II. 2008. (Proceedings of SPIE - The International Society for Optical Engineering).
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