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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 9 — Mar. 20, 2010
  • pp: 1555–1562

Spectroscopic determination of rotational temperature in C 2 H 4 / C 2 H 2 / O 2 flames for diamond growth with and without tunable CO 2 laser excitation

X. N. He, X. K. Shen, T. Gebre, Z. Q. Xie, L. Jiang, and Y. F. Lu  »View Author Affiliations

Applied Optics, Vol. 49, Issue 9, pp. 1555-1562 (2010)

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Optical emission spectroscopy (OES) and spectroscopic temperature determination were carried out to study C 2 H 4 / C 2 H 2 / O 2 flames used for diamond deposition with and without an excitation by a wavelength-tunable CO 2 laser. Strong emissions from C 2 and CH radicals were observed in the visible range in all the acquired OES spectra. When the flames were irradiated by using a continuous-wave (CW) CO 2 laser at a wavelength of 10.591 μm , the emission intensities of the C 2 and CH radicals in the flames increased owing to the laser excitation. The CO 2 laser was also tuned to a wavelength of 10.532 μm to precisely match the resonant frequency of the CH 2 -wagging vibrational mode of the C 2 H 4 molecules. OES spectroscopy of the C 2 and CH radicals were performed at different laser powers. The rotational temperatures of CH radicals in the flames were determined by analyzing the spectra of the R branch of the A 2 Δ X 2 Π ( 0 , 0 ) electronic transition near 430 nm . The deposited diamond thin-films were characterized by scanning electron microscopy, stylus profilometry, and Raman spectroscopy. The deposition mechanism with and without the CO 2 laser excitation was discussed based on the OES spectral results.

© 2010 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(300.2140) Spectroscopy : Emission
(300.6390) Spectroscopy : Spectroscopy, molecular

ToC Category:

Original Manuscript: January 4, 2010
Revised Manuscript: February 22, 2010
Manuscript Accepted: February 22, 2010
Published: March 11, 2010

X. N. He, X. K. Shen, T. Gebre, Z. Q. Xie, L. Jiang, and Y. F. Lu, "Spectroscopic determination of rotational temperature in C2H4/C2H2/O2 flames for diamond growth with and without tunable CO2 laser excitation," Appl. Opt. 49, 1555-1562 (2010)

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