Optical Emission Spectroscopy study of resonant vibrational excitation of precursor molecules in the CO2 laser-assisted flame deposition of diamond

T. Gebre; H. Ling; Y. X. Han; Z. Q. Xie; X. K. Shen; Y. F. Lu

doi:10.2351/1.5061360

Optical Emission Spectroscopy study of resonant vibrational excitation of precursor molecules in the CO₂ laser-assisted flame deposition of diamond

T. Gebre, H. Ling, Y. X. Han, Z. Q. Xie, X. K. Shen, Y. F. Lu

Electrical & Computer Engineering

Research output: Contribution to conference › Paper › peer-review

Abstract

Diamond thin films were deposited using C₂H₄/C ₂H₂/O₂ and C₃H₆/O ₂ combustion flames. At points where the diamond films were being deposited, Optical Emission Spectroscopy (OES) measurements showed that excited C₂ and CH species appear abundantly. The relative emission intensity of these species depended on the precursors used to generate the combustion flames. In addition, the irradiation of C₂H₄/C ₂H₂/O₂ and C₃H₆/O ₂ flames by a continuous-wave CO₂ laser beam (10.591 μm) resulted in increased optical emission intensity from the excited species due to resonant absorption of laser energy. OES was used to obtain molecular spectra of the excited C₂ and CH species in the flames for different gas combinations and laser powers. The overall intensity of C₂ and CH species were calculated from these spectra. The Boltzmann equation was used to obtain rotational temperatures from the spectra of the excited species. The results were used to understand the mechanism of the vibrational excitation and to study the effect of laser irradiation on flame temperature. For each condition, the intensity ratios and temperatures obtained using OES were correlated with the diamond films deposited on cemented tungsten carbide (WC-Co) substrates.

Original language	English (US)
Pages	59-64
Number of pages	6
DOIs	https://doi.org/10.2351/1.5061360
State	Published - 2008
Event	ICALEO 2008 - 27th International Congress on Applications of Lasers and Electro-Optics - Temecula, CA, United States Duration: Oct 20 2008 → Oct 23 2008

Conference

Conference	ICALEO 2008 - 27th International Congress on Applications of Lasers and Electro-Optics
Country/Territory	United States
City	Temecula, CA
Period	10/20/08 → 10/23/08

ASJC Scopus subject areas

Electrical and Electronic Engineering
Electronic, Optical and Magnetic Materials

Access to Document

10.2351/1.5061360

Cite this

Gebre, T., Ling, H., Han, Y. X., Xie, Z. Q., Shen, X. K., & Lu, Y. F. (2008). Optical Emission Spectroscopy study of resonant vibrational excitation of precursor molecules in the CO₂ laser-assisted flame deposition of diamond. 59-64. Paper presented at ICALEO 2008 - 27th International Congress on Applications of Lasers and Electro-Optics, Temecula, CA, United States. https://doi.org/10.2351/1.5061360

Optical Emission Spectroscopy study of resonant vibrational excitation of precursor molecules in the CO₂ laser-assisted flame deposition of diamond. / Gebre, T.; Ling, H.; Han, Y. X. et al.
2008. 59-64 Paper presented at ICALEO 2008 - 27th International Congress on Applications of Lasers and Electro-Optics, Temecula, CA, United States.

Research output: Contribution to conference › Paper › peer-review

Gebre, T, Ling, H, Han, YX, Xie, ZQ, Shen, XK & Lu, YF 2008, 'Optical Emission Spectroscopy study of resonant vibrational excitation of precursor molecules in the CO₂ laser-assisted flame deposition of diamond', Paper presented at ICALEO 2008 - 27th International Congress on Applications of Lasers and Electro-Optics, Temecula, CA, United States, 10/20/08 - 10/23/08 pp. 59-64. https://doi.org/10.2351/1.5061360

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title = "Optical Emission Spectroscopy study of resonant vibrational excitation of precursor molecules in the CO2 laser-assisted flame deposition of diamond",

abstract = "Diamond thin films were deposited using C2H4/C 2H2/O2 and C3H6/O 2 combustion flames. At points where the diamond films were being deposited, Optical Emission Spectroscopy (OES) measurements showed that excited C2 and CH species appear abundantly. The relative emission intensity of these species depended on the precursors used to generate the combustion flames. In addition, the irradiation of C2H4/C 2H2/O2 and C3H6/O 2 flames by a continuous-wave CO2 laser beam (10.591 μm) resulted in increased optical emission intensity from the excited species due to resonant absorption of laser energy. OES was used to obtain molecular spectra of the excited C2 and CH species in the flames for different gas combinations and laser powers. The overall intensity of C2 and CH species were calculated from these spectra. The Boltzmann equation was used to obtain rotational temperatures from the spectra of the excited species. The results were used to understand the mechanism of the vibrational excitation and to study the effect of laser irradiation on flame temperature. For each condition, the intensity ratios and temperatures obtained using OES were correlated with the diamond films deposited on cemented tungsten carbide (WC-Co) substrates.",

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AU - Shen, X. K.

AU - Lu, Y. F.

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N2 - Diamond thin films were deposited using C2H4/C 2H2/O2 and C3H6/O 2 combustion flames. At points where the diamond films were being deposited, Optical Emission Spectroscopy (OES) measurements showed that excited C2 and CH species appear abundantly. The relative emission intensity of these species depended on the precursors used to generate the combustion flames. In addition, the irradiation of C2H4/C 2H2/O2 and C3H6/O 2 flames by a continuous-wave CO2 laser beam (10.591 μm) resulted in increased optical emission intensity from the excited species due to resonant absorption of laser energy. OES was used to obtain molecular spectra of the excited C2 and CH species in the flames for different gas combinations and laser powers. The overall intensity of C2 and CH species were calculated from these spectra. The Boltzmann equation was used to obtain rotational temperatures from the spectra of the excited species. The results were used to understand the mechanism of the vibrational excitation and to study the effect of laser irradiation on flame temperature. For each condition, the intensity ratios and temperatures obtained using OES were correlated with the diamond films deposited on cemented tungsten carbide (WC-Co) substrates.

AB - Diamond thin films were deposited using C2H4/C 2H2/O2 and C3H6/O 2 combustion flames. At points where the diamond films were being deposited, Optical Emission Spectroscopy (OES) measurements showed that excited C2 and CH species appear abundantly. The relative emission intensity of these species depended on the precursors used to generate the combustion flames. In addition, the irradiation of C2H4/C 2H2/O2 and C3H6/O 2 flames by a continuous-wave CO2 laser beam (10.591 μm) resulted in increased optical emission intensity from the excited species due to resonant absorption of laser energy. OES was used to obtain molecular spectra of the excited C2 and CH species in the flames for different gas combinations and laser powers. The overall intensity of C2 and CH species were calculated from these spectra. The Boltzmann equation was used to obtain rotational temperatures from the spectra of the excited species. The results were used to understand the mechanism of the vibrational excitation and to study the effect of laser irradiation on flame temperature. For each condition, the intensity ratios and temperatures obtained using OES were correlated with the diamond films deposited on cemented tungsten carbide (WC-Co) substrates.

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