Titanium monoxide spectroscopy following laser-induced optical breakdown

Journal Article · Mon Jul 30 00:00:00 EDT 2012 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.4739915· OSTI ID:22069152

Parigger, Christian G; Woods, Alexander C; Keszler, Anna; Nemes, Laszlo; Hornkohl, James O ^[1]

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1. The University of Tennessee/UT Space Institute, Center for Laser Applications, 411 B.H. Goethert Parkway, Tullahoma, TN 37388-9700 (United States)

This work investigates Titanium Monoxide (TiO) in ablation-plasma by employing laser-induced breakdown spectroscopy (LIBS) with 1 to 10 TW/cm{sup 2} irradiance, pulsed, 13 nanosecond, Q-switched Nd:YAG laser radiation at the fundamental wavelength of 1064 nm. The analysis of TiO is based on our first accurate determination of transition line strengths for selected TiO A-X, B-X, and E-X transitions, particularly TiO A-X {gamma} and B-X {gamma} Prime bands. Electric dipole line strengths for the A{sup 3}{Phi}-X{sup 3}{delta} and B{sup 3}{Pi}-X{sup 3}{delta} bands of TiO are computed. The molecular TiO spectra are observed subsequent to laser-induced breakdown (LIB). We discuss analysis of diatomic molecular spectra that may occur simultaneously with spectra originating from atomic species. Gated detection is applied to investigate the development in time of the emission spectra following LIB. Collected emission spectra allow one to infer micro-plasma parameters such as temperature and electron density. Insight into the state of the micro-plasma is gained by comparing measurements with predictions of atomic and molecular spectra. Nonlinear fitting of recorded and computed diatomic spectra provides the basis for molecular diagnostics, while atomic species may overlap and are simultaneously identified. Molecular diagnostic approaches similar to TiO have been performed for diatomic molecules such as AlO, C{sub 2}, CN, CH, N{sub 2}, NH, NO and OH.

• OSTI ID: 22069152
• Journal Information: AIP Conference Proceedings, Vol. 1464, Issue 1; Conference: International symposium on high power laser ablation 2012, Santa Fe, NM (United States), 30 Apr - 3 May 2012; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
36 MATERIALS SCIENCE
74 ATOMIC AND MOLECULAR PHYSICS
ABLATION
BREAKDOWN
CARBON NITRIDES
ELECTRIC DIPOLES
ELECTRON DENSITY
ELECTRON TEMPERATURE
EMISSION SPECTRA
INFRARED SPECTRA
ION TEMPERATURE
LASER RADIATION
LASER SPECTROSCOPY
LASER-PRODUCED PLASMA
NEODYMIUM LASERS
NITRIC OXIDE
NONLINEAR PROBLEMS
PLASMA DENSITY
Q-SWITCHING
RADIANT FLUX DENSITY
TITANIUM OXIDES