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

doi:10.1117/12.762168

23 February 2008 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

Proceedings Volume 6880, Laser-based Micro- and Nanopackaging and Assembly II; 68800O (2008) https://doi.org/10.1117/12.762168
Event: Lasers and Applications in Science and Engineering, 2008, San Jose, California, United States

Abstract

Excited C₂ and CH species occur abundantly in diamond growth using C₂H₂/O₂, C₂H₂/C₂H₄/O₂ and C₂H₄/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 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.

Citation Download Citation

T. Gebre, J. Sun, H. Ling, Y. X. Han, M. Zao, and Y. F. Lu "C₂ and CH rotational temperatures in diamond growth using CO₂ laser-assisted combustion-flames", Proc. SPIE 6880, Laser-based Micro- and Nanopackaging and Assembly II, 68800O (23 February 2008); https://doi.org/10.1117/12.762168

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available