• 한국광학회:학술대회논문집
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• 한국광학회 2008년도 하계학술발표회 논문집
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• pp.365-366
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• 2008

• Bulletin of the Korean Chemical Society
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• 제16권5호
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• pp.387-389
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• 1995

• Bulletin of the Korean Chemical Society
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• 제16권5호
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• pp.449-453
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• 1995

An exact quantum mechanical theory is employed to treat predissociation process of the $A^2{\Sigma}^+$ state of OH. The widths and positions of the lower (v= 2 and v= 3) rovibrational levels are calculated. Energy shifts of the resonances from the zeroth order (pure Hund'scase (b)) positions are shown to be small for N $\leq$ 10, indicating that the $A^2{\Sigma}^+$ state can be described as case (b) very well for low N. Due to the differential interactions of the $A^2{\Sigma}^+_{1/2}$ and $A^2{\Sigma}^+_{-1/2}$ states with $X^2II$and $2^2II$ states, small splittings between the $F_1$ and $F_2$ levels are predicted. Calculated lifetimes of the resonances agree with experimental results reasonably well.

• Journal of Astronomy and Space Sciences
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• 제7권1호
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• pp.1-10
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• 1990

The thermodynamic distribution of the vibrational states of ozone coupled with anharmonic predissociation produces an unusual isotopomeric pattern of oxygen molecules. The model presented here explains the experimental data obtained from the electric discharge of oxygen gas to produce ozone condensed on a quartz at 77K.

• Bulletin of the Korean Chemical Society
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• 제8권5호
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• pp.424-425
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• 1987

Alkylation and allylation of arylborates give mono(ipso) and/or di(ortho and ipso) substitution products. Those factors which promote polarization or ionization of alkylating agents favor di substitution. The ${\sigma}$-type(ipso) substitution reaction of arylborates involves direct interaction of the carbon-boron bonds rather than predissociation of arylborates into aryllithiums and boranes.

• Bulletin of the Korean Chemical Society
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• 제21권5호
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• pp.497-502
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• 2000

Quantum mechanical analysis is presented for the photodissociation dynamics of the v'=4 levels of the $A^2Σ^+$ state of the OH molecule. We focus on the effects of the multichannel interactions between the asymptotically degenerate states in the recoupling region to see how they affect the dynamics near the predissociating resonances. Both the scalar (total cross section and branching ratios) and the vector properties (angular distributions and alignment parameters) of O($^3P_j, j=0, 1, 2) are treated. The resonances are predicted to be highly Lorentzian, and the branching ratios do not change much across them. Vector properties, however, show very delicate effects of the multichannel interactions and overlapping near the isolated and overlapping resonances. Computed resonance lifetimes agree reasonably well with experimental results.

• 한국수소및신에너지학회논문집
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• 제13권3호
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• pp.169-180
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• 2002

Rayleigh scattering and laser induced predissociative fluorescence are used to obtain two-dimensional images of temperature and species concentration in a laminar non-premixed flame of a diluted hydrogen jet. Rayleigh scattering cross-sections are experimentally obtained at 248nm. Planar images of OH and $O_2$ with tunable KrF excimer laser which has a) $0.5cm^{-1}$ linewidth, b) 0.5nm tuning range, c) 150mJ pulse energy, and d) 20ns pulse width are obtained to determine spatial distributions of OH and $O_2$. The technique is based on planar laser induced predissociative fluorescence (PLIPF) in which collisional quenching is almost avoided because of the fast predissociation. Dispersed LIPF spectra of OH and $O_2$ are also measured in a flame in order to confirm the excitation of single vibronic state of OH and $O_2$. OH and $O_2$ are excited on the $P_2$(8) and $Q_1$(11) line of the $A^2{\Sigma}^{+}({\nu}^{'}=3)-X^{2}{\Pi}({\nu}^{''}=o)$ band and R(17) line of the Schumann-Runge band $B^{3}{\Sigma}_{u}{^-}(\nu^{'}=0)-X^{3}{\Sigma}_{g}{^-}({\nu}^{''}=6)$, respectively. Fluorescence spectra of OH and Hot $O_2$ are captured and two-dimensional images of the hydrogen flame field are successfully visualized.